Updated on 2024/07/18

写真a

 
TANI,Hiroshi
 
Organization
Faculty of Engineering Science Professor
Title
Professor
Contact information
メールアドレス
External link

Degree

  • 博士(工学)

Research Interests

  • tribology

  • head-disk interface

  • head-disk interface;tribology;tribotronics

  • tribotronics

Research Areas

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Design engineering

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Machine elements and tribology

Education

  • Hiroshima University   Graduate School, Division of Physics

    1984 - 1986

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  • Hiroshima University   Faculty of Science

    1979 - 1984

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  • The University of Tokyo

    2003

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Research History

  • Kansai University

    2011

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  • Kansai University   Associate Professor

    2008.4

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  • 1986年日立製作所小田原工場に入社以来、磁気ディスクの開発設計に従事した。その中で磁気ディスクのヘッドディスクインタフェースのトライボロジーに関した開発設計を主に担当。

    1986.4 - 2008.3

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Professional Memberships

Committee Memberships

  • 日本機械学会IIP部門   総務委員会 委員長  

    2022   

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  • 日本機械学会   関西支部商議員 代表会員  

    2021   

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  • 日本機械学会IIP部門   部門長  

    2021   

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  • 日本機械学会   英文ジャーナル 委員  

    2019   

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  • 日本機械学会IIP部門   編集委員会 委員長  

    2019   

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  • 日本機械学会   学術編集部会邦文 委員  

    2019   

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  • 日本機械学会IIP部門   IoT 技術に関する研究分科会 主査  

    2019   

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  • 日本機械学会IIP部門   事業委員会 委員長  

    2018   

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  • 日本トライボロジー学会   編集委員会 委員長  

    2017   

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  • 日本機械学会IIP部門   広報委員会 委員長  

    2017   

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  • 日本トライボロジー学会   理事  

    2016 - 2017   

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  • 日本トライボロジー学会   編集委員会 副委員長  

    2016   

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  • 日本機械学会IIP部門   学術委員会 委員長  

    2016   

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  • 日本機械学会IIP部門   学術委員会 副委員長  

    2015   

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  • 日本機械学会   関西支部 商議員  

    2014 - 2015   

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  • 日本機械学会IIP部門   MIPE2015実行委員会 幹事  

    2013 - 2015   

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  • 日本機械学会   関西支部 代議員  

    2009 - 2012   

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  • 日本機械学会IIP部門   情報・知能・精密機器(ⅡP)部門 運営委員  

    2009   

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Papers

  • Tribofilm Formation and Friction Reduction Performance on Laser-Textured Surface with Micro-Grooved Structures Reviewed

    Qianru Li, Renguo Lu, Hiroshi Tani, Shohei Kawada, Shinji Koganezawa, Xujun Liu, Peihong Cong

    Lubricants   12 ( 3 )   91 - 91   2024.3

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:MDPI AG  

    Tribofilms, resulting from tribochemical reactions involving lubricants, additives, and metal surfaces, are pivotal in reducing friction, preventing adhesion, and minimizing wear. This study investigates the tribological characteristics of textured surfaces in boundary lubrication, emphasizing the impact of surface texturing on tribofilm formation. Untextured surfaces manifest high friction coefficients and low wear owing to the development of thick tribofilms. However, debris accumulation impedes further tribochemical reactions, necessitating more energy for sliding and resulting in higher friction coefficients. Additionally, molybdenum dialkyl dithiocarbamate-derived MoS2 oxidation diminishes the expected lubrication effect. Textured surfaces exhibit lower friction coefficients and higher wear because the structure aids debris removal, promoting the formation of thinner tribofilms. Despite increased wear from solid-to-solid contact, textured surfaces facilitate an early fluid lubrication transition and enhance cavitation capacity, leading to reduced friction coefficients. We also consider the impact of sliding direction angles on friction coefficients, revealing that lower angles parallel to the grooves heighten friction, whereas higher angles enhance cavitation capacity. Unexpectedly, a 90° sliding direction angle increases the friction coefficients, attributed to MoS2 distribution in the tribofilms. These results provide crucial insights for optimizing lubrication strategies and enhancing wear resistance in boundary lubrication scenarios.

    DOI: 10.3390/lubricants12030091

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  • Effect of Humidity on Head Smear Generation in Head-Assisted Magnetic Recording Reviewed

    Hiroshi Tani, Hiroshi Kurafuji, Norio Tagawa, Shohei Kawada, Renguo Lu, Shinji Koganezawa

    IEEE Transactions on Magnetics ( Early Access )   2023.6

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  • Control of head smear generation by diamond-like carbon films using an external electric field Reviewed

    Tani, H, Lu, R, Koganezawa, S, Tagawa, N

    Microsystem Technologies   Vol.29, No.3, 2022,pp.1-6.   2023.1

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    https://doi.org/10.1007/s00542-023-05421-0

    DOI: 10.1007/s00542-023-05421-0

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  • Effects of Oxygen on Smear Formation in Heat Assisted Magnetic Recording System Reviewed

    K Yakata,, H Kurafuji,, H Tani,, R Lu,, S Koganezawa,, S Kawada,, N Tagawa,

    Tribology Online   Vol.17, No.4, 2023, pp.348-355.   2022.12

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  • Alkylated Polyphenyl Ethers as High-Performance Synthetic Lubricants Reviewed

    Renguo Lu,, Hiroshi Tani,, Shinji Koganezawa,, Mayayuki Hata,

    Lubricants   Vol.10, No10, 2022, pp.275.   2022.10

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  • Young’s Modulus of Fatty Acid Adsorption Films on Si Surface Measured Using Ar Gas Cluster Ion Beams Reviewed

    1. Hiroshi Tani, Norio Tagawa, Shouhei Kawada, Renguo Lu, Shinji Koganezawa,

    Tribology Online   Vol.17, No.2,2022, pp.110-117.   2022.6

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  • Effective Elastic Moduli of Magnetic Disks with Molecularly Thin Liquid Lubricant Films Determined using Ar-Gas Cluster Ion Beam Reviewed

    Hiroshi Tani, Renguo Lu, Shinji Koganezawa, Norio Tagawa

    Tribology Online   Vol.17, No.1, 2022, pp.32-43.   2022.2

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    Effective Elastic Moduli of Magnetic Disks with Molecularly Thin Liquid Lubricant Films Determined using Ar-Gas Cluster Ion Beam

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  • Magnetostrictive vibration sensor for a self- powered structural health monitoring system, Reviewed

    Shinji Koganezawa, Tomotake Ishii, Hiroshi Tani, Renguo Lu, Norio Tagawa

    JSME Journal of Advanced Mechanical Design, Systems, and Manufacturing,   Vol. 16, No. 1, (2022),DOI https://doi.org/10.1299/jamdsm.2022jamdsm0010Magnetostrictive vibration sensor for a self- powered structural health monitoring system   2022

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  • Evaluating the Elastic Moduli of Ultra-Thin Liquid Perfluoropolyether Lubricant Films on Diamond-Like Carbon Films Using Ar-Gas Cluster Ion Beams Reviewed

    Hiroshi Tani, Renguo Lu, Shinji Koganezawa, Norio Tagawa

    Tribology Online   Vol.16, No.4, 2021, pp.309-316.   2021.12

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    Evaluating the Elastic Moduli of Ultra-Thin Liquid Perfluoropolyether Lubricant Films on Diamond-Like Carbon Films Using Ar-Gas Cluster Ion Beams

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  • Electric Field Effect on Friction Coefficient of Diamond‑Like Carbon Film Heated by Laser Irradiation, Reviewed

    Hiroshi Tani, Yuki Izutani, Renguo Lu, Shinji Koganezawa, Norio Tagawa,

    Tribology Letters   Vol.69, No.103, 2021.   2021.7

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    Electric Field Effect on Friction Coefficient of Diamond‑Like Carbon Film Heated by Laser Irradiation,

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  • Investigation of mechanism of smear formation from diamond-like carbon films on heating

    Hiroshi Tani, Renguo Lu, Shinji Koganezawa, Norio Tagawa

    Microsystem Technologies   27 ( 6 )   2243 - 2255   2021.6

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media Deutschland GmbH  

    The formation of head smears during the heat-assisted magnetic recording is a significant problem that must be addressed to ensure the reliability of the head-disk interface. In this study, the formation of a head smear by diamond-like carbon (DLC) films on magnetic disks was analyzed through simulated heating experiments. DLC films with a thickness of 100 nm were prepared and heated on a hot plate in an environmental gas chamber. A smear was observed on a silicon wafer placed 3 mm above the DLC surface film after the heating of the film. The smear amount was quantified based on the intensity of the carbon peak of the smear, which was measured by X-ray photoelectron spectroscopy. In air, the carbon concentration decreased with the heating temperature, while in nitrogen, it increased. Further, the carbon concentration of the smear formed in air was lower than that in nitrogen. A comparison of the smears formed by DLC films with different hydrogen concentrations showed that a greater amount of the decomposition gases was generated from the DLC films with a higher hydrogen concentration and that this value increased at lower temperatures. This result suggests that DLC films with low hydrogen concentrations generate smaller amounts of the decomposition gases during heating than those with high hydrogen concentrations. In addition, the results of Raman spectroscopy suggested that the DLC films get degraded during heating, resulting in the generation of hydrocarbon gases because the films contain carbon and hydrogen. Moreover, since peaks related to fragments with atomic masses of 250–500 atomic mass units were observed in the time-of-flight secondary ion mass spectrometry spectra of the smears, it can be concluded that the smears consist of hydrocarbons with relatively higher molecular weights.

    DOI: 10.1007/s00542-020-05041-y

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  • ELECTROMAGNETIC ENERGY HARVESTER for TRANSPORTATION INFRASTRUCTURE USING VEHICLE-TREAD FORCE

    Shinji Koganezawa, Kota Morii, Hiroshi Tani, Renguo Lu, Norio Tagawa

    Proceedings of the ASME 2021 30th Conference on Information Storage and Processing Systems, ISPS 2021   2021

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:American Society of Mechanical Engineers (ASME)  

    We propose a novel electromagnetic energy-harvesting device (EHD) for structural health monitoring systems of transportation infrastructures. The EHD is embedded in the road surface and uses the tread force of cars as the input force when tires of cars pass over it. Because the input force is very fast, the proposed EHD can generate a large amount of energy. The footprint of the device is 20× 20 mm, its height is 7.5 mm, and its volume is 2.4 cm3. We measured the energy generated when a bicycle passed over the EHD 34 times at various speeds between 5 and 15 km/h. Subsequently, we obtained the regression curve from the results, which showed the relationship between the bicycle speed and generated energy, and estimated the electric energy generated by car at higher speeds. The results showed that, even though the size of the EHD was small, electric energies of 100 ?J, and 1.0 mJ could be generated at car speeds of 17 km/h, and 52 km/h, respectively.

    DOI: 10.1115/ISPS2021-63672

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  • CONTROL of HEAD SMEAR GENERATED from DLC FILMS USING AN EXTERNAL ELECTRIC FIELD

    Hiroshi Tani, Renguo Lu, Shinji Koganezawa, Norio Tagawa

    Proceedings of the ASME 2021 30th Conference on Information Storage and Processing Systems, ISPS 2021   2021

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:American Society of Mechanical Engineers (ASME)  

    In this study, the dependence of the electric field between the magnetic disk and Si wafer, used as the counter surface, on the hydrocarbon smear generated from the diamond-like carbon (DLC) overcoat was investigated. As a result, the positive electric field from the disk to the Si wafer increased the amount of smear, and the negative field reduced it. The positive electric field was estimated to extract hydrocarbon ions from the thermal plasma toward the Si wafer, and the opposite field attracts the hydrocarbon ions to the DLC surface. Therefore, the electric field between the slider and disk possibly controls the smear generation from the DLC overcoat, which is heated by laser irradiation in the heat-assisted magnetic recording).

    DOI: 10.1115/ISPS2021-63202

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  • Hybrid lubricant film with high bonding ratio and high coverage

    Hiroshi Tani, Yuki Uesaraie, Reguo Lu, Shinji Koganezawa, Norio Tagawa

    Microsystem Technologies   26 ( 11 )   3331 - 3337   2020.11

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    Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media LLC  

    DOI: 10.1007/s00542-020-04806-9

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    Other Link: http://link.springer.com/article/10.1007/s00542-020-04806-9/fulltext.html

  • Development of Vibration Sensor Using Giant Magnetostrictive Material for Self-Powered Structural Health Monitoring System

    Shinji Koganezawa, Tomotake Ishii, Hiroshi Tani, Renguo Lu, Norio Tagawa

    2020 IEEE SENSORS   2020.10

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    Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

    DOI: 10.1109/sensors47125.2020.9278840

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  • Effect of Diamond-like Carbon Coating on Preventing the Ingress of Hydrogen into Bearing Steel

    Tribology Transaction   Vol.64,No1,pp157-166   2020.10

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  • Experimental study on smear characteristics upon laser heating in air and helium in heat-assisted magnetic recording

    IEEE Transactions on Magnetics   Vol.57, No.2, 2020, 3200405.   2020.8

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  • Low Friction of Diamond-Like Carbon Film Due to Liquid Hydrocarbon Generated by Laser Heating in an Nitrogen Gas Environment

    Tribology LettersPublished online   Tribology Letters, 2020, pp.68-88.   2020.8

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  • Harvesting Energy Using Triboelectric Nanogenerator Mounted inside Rolling Tire

    Sensors and Materials   Vol.32, No.7, 2020, pp.2539-2549.   2020.7

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  • Smear and Decomposition Mechanism of Magnetic Disk PFPE Lubricant Film by Laser Heating in Air and Helium Conditions

    Tribology Online   Vol.15, No3, 2020, pp.186-193.   2020.6

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  • Investigation of smear formation mechanism from DLC film by heating

    Hiroshi Tani, Renguo Lu, Shinji Koganezawa, Norio Tagawa

    ASME 2020 29th Conference on Information Storage and Processing Systems, ISPS 2020   2020

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:American Society of Mechanical Engineers (ASME)  

    The formation of head smear from DLC films on magnetic disks was confirmed by a simulated heating experiment. DLC films of 100-nm thickness were prepared and heated on a hot plate in an environmental gas chamber. Smear on a silicon wafer placed 3 mm above the DLC surface was observed after heating of the DLC film. The smear amount was quantified using the carbon intensity of the smear measured by XPS. In air, the carbon concentration decreased with the heating temperature
    however, the carbon concentration increased with temperature in nitrogen. The carbon concentration of the smear in the air environment was smaller than that of nitrogen. As the result of comparison of smears on DLCs with various hydrogen concentrations, more decomposed gas is generated from the DLC film as the amount of hydrogen contained in the DLC increases, and this value increases at lower temperatures. This result suggests that DLC films with low hydrogen concentrations generate a smaller amount of decomposition gas than those with high hydrogen concentrations during heating. In addition, Raman spectra suggest that the DLC degraded by heating and the hydrocarbon gas-like materials were generated from the DLC film because the DLC films include carbon and hydrogen. Because fragments of 250–500 atomic mass units were observed in the TOF-SIMS spectra of smears, the smear is estimated to consist of a hydrocarbon of relatively high molecular weight.

    DOI: 10.1115/ISPS2020-1902

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  • Tribological properties of alkyldiphenylethers in boundary lubrication

    Renguo Lu, Masaya Morimoto, Hiroshi Tani, Norio Tagawa, Shinji Koganezawa

    Lubricants   7 ( 12 )   2019.12

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:MDPI AG  

    Lubricants that are used in miniaturized moving mechanical components generally serve under severe conditions, such as high temperature, high speed, and high load. Although alkyldiphenylethers (ADEs) are used as base oils for high-temperature greases, their tribological properties remain unclear. This study investigated the influence of the alkyl chains on the tribological properties of ADEs. Longer and more attached alkyl chains decreased the friction coecient of ADEs under both reciprocating and continuous sliding conditions. Wear was found to be independent of the alkyl chain under reciprocating sliding conditions due to abrasion being caused by debris that was not readily removed. ADEs showed good anti-wear properties when used as either a lubricant or an additive under continuous sliding conditions. Much smoother surfaces in the friction track were observed in comparison to poly--olefin. Fourier-Transform infrared spectroscopy analysis suggested that the ether groups were attracted to the worn steel surface, phenyl groups became consequently perpendicular, and the attached alkyl chains repelled other substances and prevented further wear of the surface. Moreover, ADEs showed a high adaptability with traditional additives.

    DOI: 10.3390/LUBRICANTS7120112

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  • Novel Ionic-Liquid-Type Lubricant for Heat-Assisted Magnetic Recording System, IEEE Transactions on Magnetics Reviewed

    IEEE Transactions on Magnetics   Vol.55, No.9, 2019, 3300707.   2019.9

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  • TOF-SIMS analysis of perfluoropolyether lubricant smear transferred from disk surface following laser heating Reviewed

    Microsystem Technologies   2020, pp.26:79-88. https://doi.org/10.1007/s00542-019-04447-7   2019.5

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  • Numerical study on the effects of linear protrusion on flow-induced carriage excitation force in hard disk drives Reviewed

    S Koganezawa, S Tsuda, H Tani, R Lu, N Tagawa

    Microsystem Technologies   2020, pp.26:33-47. https://doi.org/10.1007/s00542-019-04398-z   2019.3

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  • PFPE Lubricant film with high thermal stability deposited by photoelectron assisted chemical vapor deposition

    Hiroshi Tani, Lu Rengo, Shinji Koganezawa, Norio Tagawa

    2018 Asia-Pacific Magnetic Recording Conference, APMRC 2018   2019.1

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:Institute of Electrical and Electronics Engineers Inc.  

    In this study, we developed the new deposition method of Perfluoropolyether(PFPE) lubricant on diamond like carbon(DLC) overcoat by the photoelectron assisted chemical vapor deposition(PAcvd).Pfpe lubricant in vapor phase was deposited on DLC surface of magnetic disks with a RF pulse bias voltage between a disk surface and a counter electrode above disk surface during the ultra violet(UV) irradiation. Then, we evaluated the thermal stability for the laser beam heating and the corrosion resistance of magnetic disks with lubricant film deposited by PACVD. These disks showed higher thermal stability and high corrosion resistance than Z-tetraol lubricant film, because the lubricant film deposited by PACVD has no hydrocarbon segment in the molecular structure and has much high water repellency.

    DOI: 10.1109/APMRC.2018.8601076

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  • Tribological properties of alkyldiphenylethers in boundary lubrication

    Renguo Lu, Masaya Morimoto, Hiroshi Tani, Norio Tagawa, Shinji Koganezawa

    Czech Mycology   71 ( 2 )   2019

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Czech Scientific Society for Mycology  

    Lubricants that are used in miniaturized moving mechanical components generally serve under severe conditions, such as high temperature, high speed, and high load. Although alkyldiphenylethers (ADEs) are used as base oils for high-temperature greases, their tribological properties remain unclear. This study investigated the influence of the alkyl chains on the tribological properties of ADEs. Longer and more attached alkyl chains decreased the friction coefficient of ADEs under both reciprocating and continuous sliding conditions. Wear was found to be independent of the alkyl chain under reciprocating sliding conditions due to abrasion being caused by debris that was not readily removed. ADEs showed good anti-wear properties when used as either a lubricant or an additive under continuous sliding conditions. Much smoother surfaces in the friction track were observed in comparison to poly-α-olefin. Fourier-Transform infrared spectroscopy analysis suggested that the ether groups were attracted to the worn steel surface, phenyl groups became consequently perpendicular, and the attached alkyl chains repelled other substances and prevented further wear of the surface. Moreover, ADEs showed a high adaptability with traditional additives.

    DOI: 10.3390/lubricants7120

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  • Effect of laser heating on the smear behavior of pfpe lubricant films on magnetic disks in air and helium

    N. Tagawa, K. Yakata, H. Tani, S. Koganezawa, R. Lu

    Proceedings of 10th International Scientific Conference BALTTRIB 2019   280 - 284   2019

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:Vytautas Magnus University  

    We investigated the smear characteristics upon laser heating in air and helium. We used magnetic disks coated with the perfluoropolyether (PFPE) lubricant D-4OH. The surface of the rotating disk was heated by laser irradiation using a pin-on-disk tester setup in a sealed chamber. The temperature was varied from 258°C to 540°C. When the lubricant film was heated by the laser, the lubricant evaporated from the surface of the disk by desorption or decomposition and adhered onto a hemispherical glass pin placed 5 μm above the disk surface as smears. The smears on the pin were analyzed using time-of-flight secondary ion mass spectrometry (TOF-SIMS). It was found that the amount of smear under exposure to helium gas is greater than that to air at high temperatures. In addition, this interesting result may be attributed not only to the different lubricant depletion mechanisms due to laser heating under the two environmental conditions, but also to the diamond-like carbon (DLC) thin film at a relatively low temperature of approximately 260°C.

    DOI: 10.15544/balttrib.2019.44

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  • Nanoscale wear of carbon overcoat subjected to laser heating in an inert gas environment

    Norio Tagawa, Hiroshi Tani, Shinji Koganezawa, Renguo Lu

    Lecture Notes in Mechanical Engineering   691 - 704   2019

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:Pleiades Publishing  

    Because the diamond-like carbon (DLC) thin film overcoat on either a hard disk surface or an air bearing surface plays an important role in maintaining the reliability and durability of the head-disk interface, nanoscale DLC wear and degradation is a critical issue in heat-assisted magnetic recording (HAMR). The use of helium in hard disk drives (HDDs) has been developed and put into practical use to decrease air-induced structural vibrations, and temperature rise. In this study, fundamental experiments were conducted to understand the wear and related degradation characteristics of an ultra-thin DLC overcoat subjected to laser heating in both air and inert gas environments, using a pin-on-disk tester. An inert gas environment was simulated using helium gas. The experiments were conducted using DLC-coated glass pins and actual magnetic disks without a lubricant film. The differences in the wear and degradation characteristics of a DLC overcoat on the pin and disk surfaces between inert gas and air environments were investigated after wear tests were performed, primarily through Raman spectroscopy. We found that wear and graphitization of DLC films became greater with laser heating, while the friction coefficients between the pin and magnetic disk became markedly smaller. However, our tests also revealed that wear and graphitization of the DLC film were significantly less in an inert gas environment than in an air environment. This is because the wear observed in this experiment was predominantly due to a wear mechanism that is based on tribo-chemical oxidation.

    DOI: 10.1007/978-981-13-0411-8_62

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  • Taro-leaf inspired patterning of oleophobic surfaces with high wear resistance

    Hiroshi Tani, Naoya Yamashita, Shinji Koganezawa, Norio Tagawa

    Tribology Online   13 ( 6 )   311 - 315   2018.12

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Japanese Society of Tribologists  

    The lotus and taro leaf surfaces are superhydrophobic. We fabricated different surface patterns of lotus and taro leaves on Si surfaces and compared their contact angles and tribological properties. Three types of lotus patterns, consisting of a simple dot matrix of circular pillars with different pitches, and six types of taro patterns having the pillars distributed within a field of hexagonal ridges with different central pillar diameters and pitches, were prepared. The contact angles of water and hexadecane on these patterns were measured, and the wear resistance of each pattern was evaluated by reciprocating wear tests. The taro pattern showed a significantly higher contact angle for hexadecane and a lower coefficient of friction than the lotus pattern. The taro pattern ridges are supposed to contain air in the valleys between the ridges and pillars, which prevented sticking between the pillars and cloth fibers. Thus, the taro pattern exhibits better oleophobicity and a lower frictional force.

    DOI: 10.2474/trol.13.311

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  • Experimental study of lubricant depletion induced by pulsed laser irradiation heating in heat-assisted magnetic recording Reviewed

    Norio Tagawa, Hiroshi Tani, Yuki Uesaraie, Shinji Koganezawa, Renguo Lu

    Microsystem Technologies   2018, pp.26:5-10. https://doi.org/10.1007/s00542-018-4259-6   2018.12

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  • Frequency analysis of disturbance torque exerted on a carriage arm in hard disk drives using hilbert-huang transform

    Shinji Koganezawa, Shotaro Tsuda, Hiroshi Tani, Renguo Lu, Norio Tagawa

    IEEE Transactions on Magnetics   54 ( 11 )   2018.11

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Institute of Electrical and Electronics Engineers Inc.  

    In this paper, we applied the Hilbert-Huang transform (HHT) to the time series of the torque exerted on the carriage arm of a hard disk drive, which was calculated using the finite-element analysis. Then, a Fourier transform (FT) was implemented to perform frequency analysis
    the results were subsequently compared with the HHT results. A comparison of both spectra revealed the superior ability of HHT to perform frequency analysis of flow phenomena via disturbance torque analysis. Furthermore, the HHT results confirmed that to achieve more precise head positioning, it is necessary to decrease torque fluctuations induced by the non-stationary phenomena that are not always observed in the power spectrum obtained via the FT analysis, such as vortex shedding around an arm.

    DOI: 10.1109/TMAG.2018.2835839

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  • The polymerization reaction of cyclic siloxanes on a hard disk under static conditions Reviewed

    Tsuyoshi Shimizu, Hiroshi Tani

    Microsystem Technologies   Vol.24, No.11, 2018, pp.4641-4648.   2018.11

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  • A study on the tribofilm growth and tribological properties of tribofilms formed from zinc dialkyl dithiophosphate (ZDDP) and molybdenum dialkyl dithiocarbamate (MoDTC)

    Renguo Lu, Sora Shiode, Hiroshi Tani, Norio Tagawa, Shinji Koganezawa

    Tribology Online   13 ( 3 )   157 - 165   2018.7

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Japanese Society of Tribologists  

    Tribofilms are critical for the management of wear and the control of friction. This study focused on the tribological properties of tribofilms to clarify their antiwear and low-friction mechanisms. By monitoring tribofilm growth and measuring friction-coefficient mapping, we found that a tribofilm was generated in a dynamic process of formation and wear. The friction coefficient decreased with an increase in film thickness. The friction coefficient distributions of the tribofilms depended on the chemical nature more than the surface morphology. ZDDP formed a tribofilm with good antiwear properties, whereas MoDTC accelerated the tribofilm formation and decreased the friction coefficient.

    DOI: 10.2474/trol.13.157

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  • 摩擦帯電センサによる転がり軸受の回転速度と温度のモニタ Reviewed

    谷 弘詞, 呂 仁国, 小金沢 新治, 多川 則男

    トライボロジスト   Vol.63, No.6, 2018, pp.426-433.   2018.6

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  • Structural Changes of Perfluoropolyether Lubricant Accumulated on the Pin Surface During Laser Heating Reviewed

    Hiroshi Tani, Yuta Shibahara, Renguo Lu, Shinji Koganezawa, Norio Tagawa

    IEEE Transactions on Magnetics   Vol.54, No.11, 2018, 3300505.   2018.6

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  • Smear growth on head slider surface from siloxane outgas on heat assisted magnetic recording

    Hiroshi Tani, Yuki Uesaraie, Renguo Lu, Shinji Koganezawa, Norio Tagawa

    Microsystem Technologies   Vol.24, No.11, 2018, pp.4641–4   1 - 8   2018.3

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    In this study, the smear by the lubricant and siloxane pickup at the laser heating in the heat assisted magnetic recording (HAMR) was evaluated using our developed noncontact pin-on-disk test. The smear area on the glass pin surface was measured on the disks with three types of different lubricant films prepared by changing the ultraviolet exposure condition, rinse condition, and lubrication process. The amount of siloxane adsorbed on disk surface relates with the siloxane wettability obtained from the contact angle of siloxane for disk surface and that increased as the siloxane wettability increases. On the other hand, the lubricant pickup increases as the physical and hydrogen bonding fractions increase. Overall, these data suggest that the sufficiently low surface free energy is needed by the lubricant film with only the chemical bonding fraction to reduce the lubricant and siloxane smear at the laser heating of HAMR, because the lubricant fractions of physical and hydrogen bonding increase the lubricant pickup and the much amount of siloxane adsorbs on disks with the large surface free energy.

    DOI: 10.1007/s00542-018-3839-9

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  • Taro-Leaf Inspired Patterning of Oleoph published online obic Surfaces with High Wear Resistance Reviewed

    H Tani, N Yamashita, S Koganezawa,, N Tagawa, S Koganezawa, N Tagawa

    Tribology Online   Vol.13, No.6, 2018, pp.311-315.   2018.3

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  • Adsorption Properties of an Ultrathin PFPE Lubricant with Ionic End-Groups for DLC Surfaces

    Hiroshi Tani, Renguo Lu, Shinji Koganezawa, Norio Tagawa

    IEEE Transactions on Magnetics   54 ( 2 )   2018.2

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    This paper examines the adsorption properties of the perfluoropolyether (PFPE) lubricant SNH2 with an ionic end-group (i.e., amine salt with a diphenylether moiety) for magnetic disk surfaces in heat-assisted magnetic recording (HAMR) drives. For comparison, the well-known lubricant Z-tetraol was used as a reference material. Initially, strong interactions between the ionic end-groups of SNH2 and an applied electric field in the lubricant solution were established. The surface free energy and bonding ratio were also compared before and after ultraviolet (UV) light exposure to diamond-like carbon (DLC) disk surfaces onto, which the lubricants were coated, with their photoelectron currents measured during UV exposure. In addition, the structural characteristics of the SNH2 lubricant on the DLC surface were analyzed using a time-of-flight secondary mass spectroscopy. Furthermore, the thermal stabilities of the lubricant films were compared following laser heating. Overall, SNH2 showed higher adsorption to the DLC surface than Z-tetraol and interacted more strongly with the electric field in the lubricant solution. Furthermore, although SNH2 without UV exposure showed a large polar surface energy, this energy decreased considerably after UV exposure. This decrease is attributed to interactions between photoelectrons emitted from the DLC surface and the ionic bonds of the SNH2 molecules
    the cationic segments of the SNH2 ionic bonds dissociate, whereas the anionic main-chains chemisorb on the DLC surface at the electron holes generated from the ejected photoelectrons. SNH2 after the UV exposure showed high thermal stability because of its strong bonding to the DLC surface. Overall, these results demonstrate that a PFPE lubricant with ionic end-groups may be an effective lubricant for HAMR applications.

    DOI: 10.1109/TMAG.2017.2724038

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  • Adsorption Properties of an Ultrathin PFPE Lubricant with Ionic End-Groups for DLC Surfaces

    Hiroshi Tani, Renguo Lu, Shinji Koganezawa, Norio Tagawa

    IEEE Transactions on Magnetics   54 ( 2 )   2018.2

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Institute of Electrical and Electronics Engineers Inc.  

    This paper examines the adsorption properties of the perfluoropolyether (PFPE) lubricant SNH2 with an ionic end-group (i.e., amine salt with a diphenylether moiety) for magnetic disk surfaces in heat-assisted magnetic recording (HAMR) drives. For comparison, the well-known lubricant Z-tetraol was used as a reference material. Initially, strong interactions between the ionic end-groups of SNH2 and an applied electric field in the lubricant solution were established. The surface free energy and bonding ratio were also compared before and after ultraviolet (UV) light exposure to diamond-like carbon (DLC) disk surfaces onto, which the lubricants were coated, with their photoelectron currents measured during UV exposure. In addition, the structural characteristics of the SNH2 lubricant on the DLC surface were analyzed using a time-of-flight secondary mass spectroscopy. Furthermore, the thermal stabilities of the lubricant films were compared following laser heating. Overall, SNH2 showed higher adsorption to the DLC surface than Z-tetraol and interacted more strongly with the electric field in the lubricant solution. Furthermore, although SNH2 without UV exposure showed a large polar surface energy, this energy decreased considerably after UV exposure. This decrease is attributed to interactions between photoelectrons emitted from the DLC surface and the ionic bonds of the SNH2 molecules
    the cationic segments of the SNH2 ionic bonds dissociate, whereas the anionic main-chains chemisorb on the DLC surface at the electron holes generated from the ejected photoelectrons. SNH2 after the UV exposure showed high thermal stability because of its strong bonding to the DLC surface. Overall, these results demonstrate that a PFPE lubricant with ionic end-groups may be an effective lubricant for HAMR applications.

    DOI: 10.1109/TMAG.2017.2724038

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  • 接触型トライボチャージ発電機の開発 Reviewed

    谷 弘詞, 呂 仁国, 小金沢 新治, 多川 則男

    トライボロジスト   Vol.63, No.1, 2018, pp.52-59.   2018.1

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  • TOF-SIMS analysis of accumulated PFPE lubricant smear following laser heating

    Hiroshi Tani, Renguo Lu, Norio Tagawa, Yuta Shibahara, Shinji Koganezawa

    ASME-JSME 2018 Joint International Conference on Information Storage and Processing Systems and Micromechatronics for Information and Precision Equipment, ISPS-MIPE 2018   2018

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    The structural and molecular weight changes to lubricant picked up following laser heating in heat-assisted magnetic recording (HAMR) were analyzed using time-of-flight secondary ion mass spectrometry (TOF-SIMS). The intensity of the ion mass fragments depended on the decomposition pathways and changed drastically, as did the average molecular weight of the picked-up lubricant as heating temperature increased. The fragment series formed by the dissociation of end groups with low molecular weights (CH3O+) showed a high intensity at temperatures under 300 °C, whereas at temperatures over 400 °C, the fragments series formed by the dissociation of the end-group component (C5H9O4F2+) increased. Overall, the results presented herein suggest that the chemical and thermal stability of the hydrocarbon terminal ends of lubricants should be improved in order to decrease depletion of the lubricant film and lubricant pickup by laser heating in HAMR.

    DOI: 10.1115/ISPS-MIPE2018-8515

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  • Rotational speed and temperature monitoring of ball bearing using tribocharge sensor

    Hiroshi Tani, Daiki Okishio, Renguo Lu, Shinji Koganezawa, Norio Tagawa

    Toraibarojisuto/Journal of Japanese Society of Tribologists   63 ( 6 )   426 - 433   2018

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Japanese Society of Tribologists  

    The tribocharge sensor to monitor the rotational speed and the temperature of ball bearing was fabricated and we studied the basic feasibility this tribocharge sensor. The tribocharge sensor was built up by the segmented electrode on rotor, the segmented electrode on stator. Electrode material is Cu of 35 μm thick and the material of base film is polyirude of 25 μm thick, This sensor was attached on the side on the ball bearing. This tribocharge sensor outputted the pulse voltage from the stator electrode. The output voltage was proportional to the rotational speed of ball bearing. The generated electric power was 0.2 μW at 2000 rpm, however, the electric power of 20 μW was expected by the reduction of PFTE film thic mess. On the other hand, the temperature of ball bearing was estimated by the envelope of negative voltage from the tribocharge sensor, and the estimated temperature approximately agreed with the temperature estimated by the friction force.

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  • Insect-sized flapping-flight robot using dry friction-based self-excited vibration

    Shinji Koganezawa, Takahiro Fujiwara, Taiki Usami, Ryo Kawasaka, Lu Renguo, Hiroshi Tani, Norio Tagawa

    European Society for Precision Engineering and Nanotechnology, Conference Proceedings - 18th International Conference and Exhibition, EUSPEN 2018   195 - 196   2018

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    It is expected that, in the future, quadrotor helicopters (quadcopters) will be employed in many applications, several of which require the quadcopters to be extremely small. However, it is difficult for smaller quadcopters to achieve a sufficient lift force for flight because, with reduction in the propeller diameter, the lift force decreases more sharply than the mass does. To miniaturize flying robots, we developed a flapping-flight robot employing self-excited vibration based on dry friction, inspired by the flight mechanism of bees. The proposed structure uses a simple DC motor and is easy to control
    a large flapping angle can be obtained by operating at the resonant frequency using dry friction-based self-excited vibration with robustness. The designed flapping-flight robot is similar to a hornet in size with a body length of 5.4 mm and wingspan of 57.2 mm
    it weighs 970 mg, including the weight of a motor and battery.

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  • Development of contact type tribocharge power generator

    Hiroshi Tani, Renguo Lu, Shinji Koganezawa, Norio Tagawa

    Toraibarojisuto/Journal of Japanese Society of Tribologists   63 ( 1 )   52 - 59   2018

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Japanese Society of Tribologists  

    The contact type of tribocharge power generator was developed. This tribocharge power generator has a simple structure which two types of tribocharging films on electrode are laminated by silicon rubbers. That generated the volume density of electric power of 94μW/cm3 under the condition of 40 Hz, 2G, and 55kPa. As the results, we confirmed that the tribocharge power generator was useful for the energy harvesting and sensing the acceleration.

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  • Friction Characteristics of Ultrathin Perfluoropolyether Boundary Lubricant Films Subjected to Laser Irradiation Heating in Heat-Assisted Magnetic Recording

    Norio Tagawa, Hiroshi Tani, Shinji Koganezawa, Renguo Lu

    IEEE TRANSACTIONS ON MAGNETICS   53 ( 11 )   2017.11

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    We investigated the laser-heating-temperature dependence of the friction characteristics of magnetic disks coated with boundary lubricant films by using a pin-on-disk tester and discussed the fundamental characteristics observed. In the contact area of the glass pin and disk, we observed the area that showed a buildup and depletion of the lubricant film thickness. The amount of buildup and depletion increased with increasing heating temperature. It was found that the friction coefficient of each lubricant film initially decreased as the temperature increased. Thereafter, the minimum value of the friction coefficient of each test lubricant occurred at a specific temperature, resulting in an increase in the friction coefficient inversely as the temperature further increased. It was suggested that the specific temperature corresponds to the transition temperature at which the test lubricant film evaporates. In addition, it was also suggested that the thermal durability of the lubricant film improved because of ultraviolet treatment.

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  • Low friction properties of associated carboxylic acids induced by molecular orientation Reviewed

    Renguo Lu, Shigeyuki Mori, Hiroshi Tani, Norio Tagawa, Shinji Koganezawa

    TRIBOLOGY INTERNATIONAL   113   36 - 42   2017.9

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    Molecular alignment is key to achieving an ultra-low friction coefficient. We prepared associated carboxylic acids using oleic acid and p-pentylbenzoic acid via hydrogen bonding, involving a benzene ring and an eight-membered cyclic carboxylic acid in the molecules. We investigated frictional properties when these were added into a base oil and found that the associated carboxylic acids decreased the traction coefficient in EHL and boundary lubrication, although the viscosity increased. An in situ micro Fourier transform infrared spectroscope showed that both the eight-membered cyclic carboxylic acid and the benzene ring were oriented parallel to the shearing force, leading to the low friction coefficient.

    DOI: 10.1016/j.triboint.2016.10.042

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  • Device for direct measurement of dynamic viscoelastic properties of solid-state materials at frequencies higher than 1 kHz Reviewed

    Shinji Koganezawa, Yuta Katsuta, Renguo Lu, Hiroshi Tani, Norio Tagawa

    RHEOLOGICA ACTA   56 ( 5 )   477 - 486   2017.5

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    Viscoelastic (VE) materials are widely used in daily life. For the effective utilization of VE materials, it is necessary to know their viscoelasticity with accuracy over a wide range of frequencies, especially for high frequencies. Currently, the viscoelasticity of solid-state materials is directly measured only in the low-frequency range; for high frequencies, it is estimated based on the time-temperature superposition (TTS) principle. However, it is generally recognized that the TTS principle is suitable only for estimating the viscoelasticity of rheologically simple materials for temperatures within a limited range that is higher than the glass-transition temperature. In this paper, we propose a device that can directly measure the shear modulus and tan delta values of solid-state VE materials at high frequencies. We also propose a method for compensating for the shear deformation mode resonance of VE materials based on the mass of the moving part, to gain a more accurate understanding of viscoelasticity in the high-frequency range, and discuss the causes of errors in the compensation method. Finally, we report the VE properties of natural rubber (NR 65 IRHD) measured using the developed device and compensation method, and compare the measured results with those obtained using commercial VE measurement equipment.

    DOI: 10.1007/s00397-017-1010-7

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  • Decomposition of Perfluoropolyether Lubricant on Air-Bearing Surfaces During Heat-Assisted Magnetic Recording Reviewed

    Norio Tagawa, Hiroshi Tani, Hiroaki Asada, Renguo Lu, Shingi Koganezawa

    IEEE TRANSACTIONS ON MAGNETICS   53 ( 3 )   2017.3

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    The thermal decomposition of a thin film of D-4OH lubricant under heating conditions on air-bearing surfaces, such as those found in magnetic recording devices, was investigated using time-of-flight secondary ion mass spectroscopy. The substrates used in this experiment were those of actual magnetic head sliders with diamond-like carbon (DLC) thin-film coatings. Two kinds of surfaces were prepared: an undisturbed DLC thin-film surface and an Al2O3 surface exposed by sputtering of the DLC thin film. Changes in the positive mass spectra as a result of heating confirmed that thermal decomposition of the D-4OH lubricant thin-film occurred, and that it was catalytically accelerated by Al2O3 at heating temperatures below 150 degrees C. This observation contrasts with the fact that the D-4OH lubricant thin film on the undisturbed DLC thin-film surface did not decompose.

    DOI: 10.1109/TMAG.2016.2627532

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  • Ultrathin PFPE/DLC Hybrid Overcoat for Magnetic Disks by Photoelectron-Assisted Chemical Vapor Deposition Reviewed

    Hiroshi Tani, Rengo Lu, Shinji Koganezawa, Norio Tagawa

    IEEE TRANSACTIONS ON MAGNETICS   53 ( 3 )   2017.3

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    We developed a new method for using photoelectron-assisted chemical vapor deposition to deposit perfluoropolyether (PFPE) lubricant on a diamond-like carbon (DLC) overcoat. PFPE lubricant in the vapor phase was deposited on the DLC surface of a magnetic disk with a bias voltage between the disk surface and a counter electrode above the disk surface during ultraviolet irradiation. The bias voltage accelerated photoelectron emission from the DLC surface, and the photoelectrons partially dissociated the PFPE molecules in the vapor phase. The dissociated molecules then chemically bonded to the DLC surface. According to the experimental results, the bonded ratio of PFPE molecules to the DLC surface was approximately 100%. An ultrathin PFPE/DLC hybrid overcoat was produced as a monolithic film. This hybrid film exhibited a much lower surface energy than the reference Z-tetraol lubricant film and a high water contact angle of over 100 degrees. This hybrid film can increase the head-media clearance and improve some read/write characteristics by using the actual heads.

    DOI: 10.1109/TMAG.2016.2626297

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  • Engineering experiment of tribology: Friction and wear of rolling bearings

    Renguo Lu, Hiroshi Tani

    Toraibarojisuto/Journal of Japanese Society of Tribologists   62 ( 5 )   346 - 349   2017

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  • Nanotribology of Head-Disk Interface in Heat-Assisted Magnetic Recording System

    TAGAWA Norio, TANI Hiroshi

    JOURNAL OF JAPANESE SOCIETY OF TRIBOLOGISTS   62 ( 1 )   37 - 42   2017

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    DOI: 10.18914/tribologist.62.01_37

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  • EFFECT OF LASER HEATING ON NANOSCALE WEAR OF DLC THIN FILMS IN AN AIR ENVIRONMENT Reviewed

    Norio Tagawa, Hiroshi Tani, Shinji Koganezawa, Renguo Lu

    PROCEEDINGS OF THE ASME 26TH ANNUAL CONFERENCE ON INFORMATION STORAGE AND PROCESSING SYSTEMS, 2017   2017

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  • SMEAR GROWTH OF SILOXANE OUTGAS AT LASER HEATING Reviewed

    Hiroshi Tani, Norio Tagawa, Renguo Lu, Shinji Koganezawa

    PROCEEDINGS OF THE ASME 26TH ANNUAL CONFERENCE ON INFORMATION STORAGE AND PROCESSING SYSTEMS, 2017   2017

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    Siloxane outgas is well known to cause smears on magnetic head sliders. Siloxane outgas is vaporized from certain components in hard disk drives (HDDs), that adsorbs on the magnetic disk surfaces, and SiO2 that is denatured from siloxane by flash temperature at a slider and disk contact gets accumulated on the slider surface. On the other hand, heat assisted magnetic recording (HAMR) is being developed to improve areal density. In HAMR, a laser light heats the magnetic disk surface to 400-500 K. Siloxane adsorbed on a disk surface easily gets desorbed from the disk surface owing to thermal evaporation and dissociation by laser heating. In this study, we have studied smear growth from siloxane outgas on laser heating. We observe that the siloxane adsorbed on the disk surface grew on the glass surface above the disk surface at the laser heating spot.

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  • Behavior of Chemical Reaction between Siloxane Compounds and Surface on Carbon Materials Reviewed

    Tsuyoshi Shimizu, Hiroshi Tani

    PROCEEDINGS OF THE ASME 26TH ANNUAL CONFERENCE ON INFORMATION STORAGE AND PROCESSING SYSTEMS, 2017   2017

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    Among many organic vapor contaminations released from structural components of hard disk drives, organic sioloxanes are particularly ominous, as they can be released in a relatively large quantity. Adherence of organic pollutants to the disk surface is a factor that hinders the normal operation of the head and the disk surface. It is known that volatile siloxane oligomers such as D4 (octamethyl cycletetrasiloxane) often form cyclic polydimethylsiloxane polymers in the presence of acidic catalysts. We investigated the reaction between D4 and some carbon materials such as diamond-like carbon in hard disk and graphite. The effect of the protection of carbon materials by Perfluoropolyether (PFPE) lubricants was observed.

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  • PFPE/DLC Hybrid Overcoat Deposited by Photoelectron Assisted CVD with RF Pulse Voltage

    TANI Hiroshi, LU Reguo, KOGANEZAW Shinji, TAGAWA Norio

    The Proceedings of the Conference on Information, Intelligence and Precision Equipment : IIP   2017   A - 8   2017

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    <p>PFPE/DLC hybrid overcoat was deposited by the photoelectron assisted CVD (PACVD) with RF pulse bias voltage. The properties of PFPE film on DLC surface deposited by PACVD was compared with those by the CVD with the glow discharge plasma. The deposition rate of PACVD was much lower than that of the glow discharge plasma. The surface energy of PFPE films by PACVD was approximately 15 mJ/m<sup>2</sup> and that by the glow discharge plasma was 50 mJ/m<sup>2</sup>, and the estimated monolayer thickness of PFPE film deposited by PACVD was 7−8 Å. The PFPE film deposited by PACVD had much CF<sub>2</sub> structure at the surface, however, that deposited by the glow discharge plasma had much COO and CF structures. From these results, we estimated that the glow discharge plasma much dissociated the chemical structure of monomer PFPE gas molecules as precursor and the deposited film could not show low surface energy.</p>

    DOI: 10.1299/jsmeiip.2017.A-08

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  • HDI tribological characteristics of composite lubricant film deposited by photoelectoron assisted CVD

    NAKASONE Takuma, TANI Hiroshi, LU Renguo, KOGANEZAWA Shinji, TAGAWA Norio

    The Proceedings of the Conference on Information, Intelligence and Precision Equipment : IIP   2017   A - 9   2017

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    <p>To increase HDD capacity, the thickness of lubricant film on the magnetic disks need to be reduced. The lubricant film deposited by using the photoelectron assisted chemical vapor deposition (PACVD) with low molecular weight perfluoropolyether (PFPE) lubricant showed high bond ratio, low surface energy and high coverage. In this study, we compared the tribological performances on head-disk interface of PFPE lubricant films deposited by PACVD with DC bias voltage and RF pulse bias voltage. As the result, the lubricant film deposited by DC and RF pulse voltage showed very high touch down power (TDP). In addition, the lubricant film deposited by RF pulse voltage showed low slider wear.</p>

    DOI: 10.1299/jsmeiip.2017.A-09

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  • Temperature dependence of friction properties of non-lubricated DLC on disk surface

    YAMAZAKI Hirotaka, TANI Hiroshi, RU Renguo, TAGAWA Norio, KOGANEZAWA Shinji

    The Proceedings of the Conference on Information, Intelligence and Precision Equipment : IIP   2017   A - 12   2017

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    To further increase recording density of disk storage drives, the heat assisted magnetic recording (HAMR) can solve the coercive force problem of thermal fluctuation and is regarded as the key technology for achieving recording density of more than 1Tb/in<sup>2 (1)(2)</sup>. In this technology, it is suggested that there are serious issues for the diamond like carbon (DLC) overcoat on the disk surface. Because that is heated to high temperature with laser beams<sup>(2)</sup>. In this study, first, we measured temperature dependence of friction properties of non-lubricated DLC surface on magnetic disks. Second, we considered the influence of the accumulated smear on test pin surface during the friction test. As a result, it was estimated that the smear on pin surface accumulated by the laser irradiation was originated from the hydrocarbon contamination adsorbed on DLC surface.

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  • Structure change of ultra-thin DLC by laser-heating using surface enhanced Raman spectroscopy

    SASANO Yamato, TANI Hiroshi, LU Renguo, TAGAWA Norio, KOGANEZAWA Shinji

    The Proceedings of the Conference on Information, Intelligence and Precision Equipment : IIP   2017   H - 1   2017

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    In recent years, the information society rapidly developed. It is required to increase density of hard disk drives (HDDs). In order to achieve the high density HDDs, it is important to research details of magnetic disk surface and some properties related with the head-disk interface. However, diamond like carbon (DLC) film on disks have been too thin to analyze chemical structure of DLC surface using Raman spectroscopy. In this study, we fabricated the plasmon lens with the sliver thin film on the surface by the vapor deposition and evaluated the structure change of ultra-thin DLC after laser-heating using surface enhanced Raman spectroscopy with the plasmon lens.

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  • Decomposition of perfluoropolyether lubricant picked up on actual air bearing surface in heat-assisted magnetic recording Reviewed

    Norio Tagawa, Hiroshi Tani, Hiroaki Asada, Renguo Lu, Shinji Koganezawa

    2016 Asia-Pacific Magnetic Recording Conference, APMRC 2016   2016.7

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:Institute of Electrical and Electronics Engineers Inc.  

    The thermal decomposition of D-4OH lubricant thin film on an actual air-bearing surface under heating conditions was investigated using time-of-flight secondary ion mass spectroscopy (TOF-SIMS). The substrates used in this experiment are those of actual magnetic head sliders with diamond-like carbon (DLC) thin-film coatings. Two kinds of surfaces were prepared
    an undisturbed DLC thin-film surface and an AhO3 surface exposed by sputtering of the DLC thin film. Comparison of the changes in the positive mass spectra due to heating confirmed that thermal decomposition of the D-4OH lubricant thin-film occurred and that it could be accelerated by the catalysis of Al2O3 at heating temperatures below 150°C. This is despite the fact that the D-4OH lubricant thin-film on the undisturbed DLC thin-film surface did not decompose.

    DOI: 10.1109/APMRC.2016.7524262

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  • Diamagnetic Oil Seal for Pivot Bearings of Hard Disk Drives

    Hiroshi Tani, Shinji Koganezawa, Norio Tagawa

    IEEE TRANSACTIONS ON MAGNETICS   52 ( 7 )   2016.7

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    In this paper, we focused on the diamagnetism of grease oil for pivot bearings in hard disk drives (HDDs) and investigated the effect of a magnetic field on oil vapors. We vaporized the grease oil and compared the amounts of oil adsorbed on disk surfaces through two slits-one with magnets and the other without-in a preliminary experiment. As a result, we confirmed that it is possible to reduce the amount of oil adsorbed on a disk surface with the aid of a magnetic field. Based on the preliminary experiment, the grease oil vapor from the pivot bearing unit of HDDs was compared with regard to a narrow slit and clearance with and without the magnetic field gradient of permanent magnets. The amount of oil vapor was decreased by the magnetic field gradient, and the reduction ratio depended on the environmental temperature. The amount of oil vapor from the actual pivot bearing unit could be reduced by the ring magnet around the pivot unit. Finally, our results suggested the possibility of a gas seal generated by the magnetic field gradient for the pivot bearing unit in HDDs.

    DOI: 10.1109/TMAG.2015.2511740

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  • Reduction in lubricant pickup by bias voltage between slider and disk surfaces

    Hiroshi Tani, Shinji Koganezawa, Norio Tagawa

    MICROSYSTEM TECHNOLOGIES-MICRO-AND NANOSYSTEMS-INFORMATION STORAGE AND PROCESSING SYSTEMS   22 ( 6 )   1221 - 1225   2016.6

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    We studied the effect of bias voltage between slider and disk surfaces to reduce lubricant pickup by the slider. A perfluoropolyether (PFPE) lubricant film, which is coated on the disk surface, has been considered to be charged to a negative voltage by the airflow on the rotational disk surface. Because the PFPE lubricant film is negatively charged, the lubricant pickup should be reduced by a bias voltage with a negative voltage on the slider surface. We confirmed changes in the lubricant pickup in a lubricant pickup test conducted at different bias voltages. A positive voltage of the slider accelerated the lubricant pickup, whereas a negative voltage reduced it.

    DOI: 10.1007/s00542-016-2814-6

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  • Improvement in Heat Resistance of Perfluoropolyether Lubricant Films on Magnetic Disks by UV Irradiation with a Bias Voltage on the Disk Surface

    H. Tani, Y. Sakane, S. Koganezawa, N. Tagawa

    TRIBOLOGY LETTERS   62 ( 2 )   2016.5

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    Our previous study confirmed that the photo-electron-assisted ultraviolet (UV) irradiation with a bias voltage between the magnetic disk and the counter electrode above the disk surface increased the bonded ratio of a perfluoropolyether lubricant film on the disk surface. In this study, two types of lubricant materials (Fomblin Z-tetraol and Moresco ADOH) were prepared and coated on disks. After coating the lubricant films, UV irradiation of the lubricated disk surface was performed using the normal process and the photoelectron-assisted process, and the depletions of these lubricant films were compared using the pin-on-disk test with the laser heating function. The results showed that the lubricant film treated with normal UV irradiation without the bias voltage showed a deeper depletion of the lubricant film than that treated with photo-electron-assisted UV irradiation, and the ADOH film showed a shallower depletion than the Z-tetraol film. However, the molecular weight distributions of the ADOH films on DLC surfaces treated by UV irradiation were compared using time-of-flight secondary ion mass spectroscopy, and the film treated with photoelectron-assisted UV irradiation did not change owing to dissociation after photoelectron capture. Photoelectron-assisted UV irradiation led to the decomposition of the cyclo-triphosphazene end groups. Therefore, it is assumed that the depletion of lubricant films treated with photoelectron-assisted UV irradiation was reduced, since the bonding strength to the DLC surface increased because of the greater decomposition of end groups.

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  • Separated pivot-shaft actuator for small skew angle in hard disk drives Reviewed

    Shinji Koganezawa, Hiroshi Tani, Norio Tagawa

    MICROSYSTEM TECHNOLOGIES-MICRO-AND NANOSYSTEMS-INFORMATION STORAGE AND PROCESSING SYSTEMS   22 ( 2 )   297 - 303   2016.2

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    A large skew angle in a hard disk drive (HDD) adversely affects the flying stability of the head sliders and the off-track capability of the read/write head. A novel actuator in the form of a separated pivot-shaft actuator (SPA) with a small skew angle is proposed in this paper. The SPA was particularly designed for a four-disk 3.5-in. HDD and has a skew angle of +/- 1.6A degrees, which is approximately one-tenth of that of a conventional voice coil motor. The SPA was numerically analyzed by a finite element method, and its mechanical characteristics were compared with those of a long-arm actuator (LAA) (which is a strong candidate for a small-skew-angle actuator) with respect to the seek performance and frequency response. It was found that the SPA had a higher resonant frequency, which enabled the achievement of a wider servo-bandwidth compared to the LAA, and that the average seek time of the SPA was significantly shorter than that of the LAA.

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  • Study on the direct measurement of viscoelastic characteristics in the high-frequency range

    Shinji Koganezawa, Yuta Katsuta, Hiroshi Tani, Norio Tagawa

    Proceedings of the 16th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2016   2016

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    Viscoelastic (VE) materials are widely used in our daily lives. To utilize VE materials effectively, it is necessary to understand the accurate viscoelasticity over a wide frequency range, especially in the high frequency range. Currently, viscoelasticity is directly measured only in the low-frequency range, and viscoelasticity in the higher frequency is estimated based on the time- Temperature superposition (TTS) principle. However, it is generally recognized that estimation by the TTS principle is adequate only for rheologically simple materials in a limited range of temperatures above the glass- Transition temperature. In this study, we proposed a shear- Type measuring device that can directly measure the shear modulus and tan δ of VE materials. We also proposed a compensation method for the shear deformation mode resonance of the VE material based on the mass value of the moving part to gain a better and more accurate understanding of viscoelasticity in the high frequency range.

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  • Thermal behavior of frictional properties on ultra-thin perfluoropolyether lubricant film

    Hiroshi Tani, Shinji Koganezawa, Norio Tagawa

    Tribology Online   11 ( 1 )   1 - 12   2016

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    We investigate the thermal behavior of the friction property of ultra-thin perfluoropolyether (PFPE) lubricant film on diamond-like carbon (DLC) overcoats of magnetic disks. We use a newly developed pin-on-disk tester with laser irradiation heating. Results show that the friction coefficient of a lubricated DLC surface with Z-tetraol decreased with increased temperature, while for lubricated disks with Z-03, it gradually decreased at around 120°C and increased over 120°C. This minimal point may indicate the transition temperature. The friction coefficient of both lubricant films on the DLC surface varied with the kinematic viscosity of the lubricant materials, and decreasing the kinematic viscosity decreased the friction coefficient.

    DOI: 10.2474/trol.11.1

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  • Reduction in secondary-actuator displacement in dual-stage actuator system by imparting rotational stiffness in hard disk drives Reviewed

    Shinji Koganezawa, Hirofumi Sano, Hiroshi Tani, Norio Tagawa

    MICROSYSTEM TECHNOLOGIES-MICRO-AND NANOSYSTEMS-INFORMATION STORAGE AND PROCESSING SYSTEMS   21 ( 10 )   2187 - 2195   2015.10

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    For dual-stage actuator systems in hard disk drives, stroke-saturation of the secondary actuator must be avoided to prevent the servo system from becoming unstable. In this study, a reduction in the secondary-actuator displacement was investigated by imparting a rotational stiffness to a voice coil motor (VCM). It is shown that an increase in the first resonant frequency of the VCM is largely effective for decreasing the secondary-actuator displacement in the general dual-stage actuator system. Then, an actuator, which can impart a rotational stiffness to the VCM, was designed and facilitated. A new control system for dual-stage actuators employing the actuator was also considered. It was confirmed that the proposed servo system reduced the head-positioning errors due to air-flow-induced carriage vibration by more than 35 % compared with a conventional dual-stage actuator system. Furthermore the secondary-actuator displacement was reduced 52 % on average.

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  • 超薄膜PFPE 潤滑膜の摩擦特性の温度依存性 Reviewed

    谷弘詞, 小金沢新治, 多川則男

    トライボロジスト   Vol.60, No.8, 2015, pp.538-548.   2015.4

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  • Degradation of Lubricant Film and Carbon Overcoat Subjected to Laser Heating in an Inert Gas Environment in Thermally Assisted Magnetic Recording

    Norio Tagawa, Hiroshi Tani, Shinji Koganezawa

    IEEE TRANSACTIONS ON MAGNETICS   51 ( 4 )   2015.4

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    This paper investigates the depletion of a thin lubricant film subjected to laser heating in an inert gas environment, and we experimentally elucidate the fundamental characteristics and mechanisms related to lubricant depletion in air and inert gas environments. In addition, fundamental experimental studies are conducted to understand the structural stability or degradation, such as through oxidation and graphitization of diamond-like carbon (DLC) thin films subjected to laser heating, in an inert gas environment compared to air environment. The degradation and its mechanisms are investigated using Raman spectroscopy. The results suggest that less degradation would occur by oxidation for a DLC thin film in an inert gas environment than air environment. It is found that, from the view point of the reliability in the head/disk interface, the lubricant depletion issue is more crucial than DLC thin-film degradation for thermally assisted magnetic recording in an inert gas environment.

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  • Application of vertically aligned carbon nanotubes on burnishing slider in cleaning process of magnetic disk surfaces Reviewed

    Hiroshi Tani, Keisuke Konishi, Wataru Norimatsu, Michiko Kusunoki, Norio Tagawa

    Microsyst Technol   Vol.21, 2015. pp.295-300.   2015.1

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  • Numerical and Experimental Study on Disk Flutter Reduction Using Disk-Spacer Dampers in Hard Disk Drives

    Shinji Koganezawa, Tetsuki Yamamoto, Hiroshi Tani, Norio Tagawa

    IEEE TRANSACTIONS ON MAGNETICS   50 ( 11 )   2014.11

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    This paper presents a disk-spacer damper (DSD), a new damper structure, for reducing disk flutter. Three types of DSD structures, which consist of an aluminum disk spacer having grooves embedded with viscoelastic (VE) films, have been developed in this paper. First, we investigated the material properties of the VE film, such as shear modulus and discrete relaxation spectra, and then carried out numerical analysis of the damping effect using the material properties. Further, we measured the damping effect of each DSD structure and confirmed that the proposed DSD reduces the disk flutter amplitude between the (0,1) mode and the (0,4) mode by 20%-30%.

    DOI: 10.1109/TMAG.2014.2318032

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  • External Electric Field Assisted Ultraviolet Irradiation for Bonding of Lubricant Film on Magnetic Disks

    Hiroshi Tani, Yasuo Sakane, Shinji Koganezawa, Norio Tagawa

    IEEE TRANSACTIONS ON MAGNETICS   50 ( 11 )   2014.11

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    In this paper, we sought to determine if, during ultraviolet (UV) exposure, the external electric field could control the bonded lubricant thickness. During UV irradiation, the effect of the external electric field on both the bonded lubricant thickness and surface free energy was studied. The lubricant films after UV irradiation were analyzed using time-of-flight secondary ion mass spectroscopy (TOF-SIMS). Because of the negative electric field, the polar component of the surface free energy was reduced, while the bonded lubricant thickness increased. Based on the results of the TOF-SIMS analysis, we concluded that these findings resulted from the negative electric field accelerating the photoelectron emission, and because of these photoelectrons, the bonding between the end groups and diamond-like carbon surface increased.

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  • Degradation of Carbon Overcoat Subjected to Laser Heating in an Inert Gas Environment in Thermally Assisted Magnetic Recording

    Norio Tagawa, Hiroshi Tani, Shinji Koganezawa

    IEEE TRANSACTIONS ON MAGNETICS   50 ( 11 )   2014.11

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    Because the diamond-like carbon (DLC) thin film overcoat on a hard disk surface plays an important role in maintaining the reliability and durability of the head-disk interface, DLC degradation is a critical issue in thermally assisted magnetic recording (TAMR). The use of helium in hard disk drives (HDDs) is being developed to decrease air-induced structural vibrations, windage loss, and temperature rise. TAMR technology is suggested to be put to practical use in a helium environment in HDDs. In this paper, fundamental experiments have been conducted to understand the structural stability or degradation of an ultrathin DLC overcoat subjected to laser heating in an inert gas environment. An inert gas environment was simulated using nitrogen gas. The degradation of DLC thin films fabricated through chemical vapor deposition was investigated by varying the laser irradiation duration and controlling the intensity of the laser, and it was evaluated through Raman spectroscopy. The differences in the damage mechanisms between an inert gas and air environments were elucidated. We found that the degradation of DLC thin films by oxidation would be significantly less in an inert gas environment than in an air environment.

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  • Structural stability of nanometer thick diamond-like carbon films subjected to heating for thermally assisted magnetic recording

    Norio Tagawa, Hiroshi Tani

    MICROSYSTEM TECHNOLOGIES-MICRO-AND NANOSYSTEMS-INFORMATION STORAGE AND PROCESSING SYSTEMS   20 ( 8-9 )   1405 - 1411   2014.8

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    In this study, the structural stability of ultra-thin diamond-like carbon (DLC) films subjected to heating was investigated experimentally. The thermal robustness of nanometer thick DLC films for thermally assisted magnetic recording was demonstrated, and their damage mechanisms were elucidated using chemical vapor deposition and filtered cathodic vacuum arc DLC films. In addition, the refractivity of disk substrates with heated DLC thin films was evaluated using a scanning microellipsometer. This measurement system is suggested to be an effective method for evaluating the thermal stability of DLC films. The effect of the heating duration on the thermal stability of DLC films was also investigated by this method. Further, it was suggested that DLC thin films on an air bearing surface may be affected by laser heating because this surface may be heated for a significantly longer duration owing to the magnetic head read/write operation. However, the DLC thin films on the disk substrate may not be affected as severely by laser heating.

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  • Tribological Properties of Ultrathin DLC-Coated Nanotextured Surface on a PET Film

    Hiroshi Tani, Hideyuki Takahashi, Shinji Koganezawa, Norio Tagawa

    TRIBOLOGY LETTERS   54 ( 3 )   221 - 227   2014.6

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    The wear resistance of two types of nanotextured surfaces, fabricated on polyethylene terephthalate films and coated subsequently with a diamond-like carbon (DLC) layer and then a self-assembled monolayer (SAM) film with perfluoropolyether main chains, was compared. Nanotextures with hole and pillar patterns were fabricated by a nanoimprint process. The hole nanotexture with DLC and SAM films showed better wear resistance than the pillar nanotexture, and that film showed higher oil repellency than the pillar nanotexture with DLC and SAM films. The von Mises and shear stresses of the pillar nanotexture were concentrated on the center and at the bottom of the asperity surface, and it was estimated from finite element method calculations that these stresses accelerate the wear of asperities.

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  • Slider Wear on Disks Lubricated by Ultra-Thin Perfluoropolyether Lubricants with Different Molecular Weights

    Nagayoshi Kobayashi, Hiroshi Tani, Tsuyoshi Shimizu, Shinji Koganezawa, Norio Tagawa

    TRIBOLOGY LETTERS   53 ( 1 )   43 - 49   2014.1

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    In this study, the wear properties of a magnetic head slider on disks lubricated by ultra-thin perfluoropolyether (PFPE) lubricants with different molecular weights were evaluated by the continuous sliding of magnetic head sliders using the slider contact by the dynamic flying height control. Two types of PFPE lubricants (Z-tetraol and D-4OH) with different molecular weights were evaluated. Results show that the slider wear depended on the coverage of the lubricant film; i.e., the lubricant film with sufficient coverage reduced slider wear. The lubricant film with a low molecular weight (low-Mw), including a lubricant material with a Fomblin and Demnum main chain, exhibited better coverage on a diamond-like carbon surface. Sliders with a low-Mw lubricant film showed less wear than those of a high molecular weight (high-Mw), and the depletion of the low-Mw lubricant film was less than that of the high-Mw lubricant film.

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  • Effect of Vapor Lubrication on Head Disk Clearance and Slider Wear in Inert Gas Environments Reviewed

    Hiroshi Tani, Jun Tomita, Shinji Koganezawa, N. Tagawa

    PROCEEDINGS OF THE ASME CONFERENCE ON INFORMATION STORAGE AND PROCESSING SYSTEMS, 2014   2014

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  • Tribological characteristics of novel branched perfluoropolyether lubricant films in hard disk drivers Reviewed

    TAGAWA, Norio, TANI, Hiroshi

    Microsyst. Technol   Vol.19, No.9, pp.1513-1518.   2013.8

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  • Drag Reduction of Laminar Airflow in Circular Pipe With Magnetic Field

    Hiroshi Tani, Shinji Koganezawa, Norio Tagawa

    IEEE TRANSACTIONS ON MAGNETICS   49 ( 7 )   3468 - 3471   2013.7

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    The drag friction of the laminar air flow in a steel pipe with permanent magnets attached was compared to that in a pipe without magnets. The drag reduction rate decreased as a function of the Reynolds number in the laminar flow regime, and it reduced to a low percentage when the Reynolds number was greater than 3000 in the turbulence air flow regime. These results suggest that the velocity of the boundary air flow on the pipe wall surface was accelerated by the magnetic field gradient produced by the permanent magnets attached to the outer pipe surface. The velocity of the boundary air flow, as roughly estimated by calculating the magnetic field distribution, could approximately express the experimental results.

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  • Relationship of Adhesion/Friction Forces and Slider Vibration in Surfing-Recording HDI System

    Hiroshi Tani, Toshiya Mitsutome, Daisuke Kamei, Norio Tagawa

    IEEE TRANSACTIONS ON MAGNETICS   49 ( 7 )   3752 - 3755   2013.7

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    In this study, the friction forces between a slider and disk surface with different lubricant thicknesses were measured at touchdown. Touchdown measurements of the friction and adhesion forces on a disk were made using a pin-on-disk tribotester. The friction force at touchdown could not be explained by a monotonic behavior, where the friction force gradually decreased with the lubricant thickness. Based on a comparison of the results measured using the pin-on-disk tribotester, it was estimated that the optimal adhesion force and a lower friction force are needed for the surfing regime at touchdown.

    DOI: 10.1109/TMAG.2013.2240660

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  • Adhesion and Friction Behavior of Magnetic Disks With Ultrathin Perfluoropolyether Lubricant Films Having Different End-Groups Measured Using Pin-on-Disk Test Reviewed

    Hiroshi Tani, Toshiya Mitsutome, Norio Tagawa

    IEEE TRANSACTIONS ON MAGNETICS   49 ( 6 )   2638 - 2644   2013.6

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    In this paper, the adhesion and friction forces between a glass pin and disk surfaces coated by lubricants with different numbers of hydroxyl endgroups (Z-03, Z-dol, Z-tetraol, and Z-TMD) were measured using a pin-on-disk microtribotester. The adhesion force decreased in the order of Z-dol, Z-TMD, Z-tetraol, and Z-03. The friction force at the applied load force of 0 mN decreased in the order of Z-TMD, Z-tetraol, Z-dol, and Z-03. These trends could not be obviously explained by the number of hydroxyl endgroups. Next, we investigated the relationship between the adhesion energy and the total surface energy. The adhesion force was roughly proportional to the surface energy, and the friction force was proportional to the friction factor defined by the friction coefficients of the carbon overcoat and the lubricant film, the lubricant film coverage, and the total surface energy. Based on the results, we suggested a friction model of the contact between the pin and disk surfaces.

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  • Structural stability of nanometer-thick diamond-like carbon films due to heating for thermally assisted magnetic recording Reviewed

    Norio Tagawa, Hiroshi Tani

    PROCEEDINGS OF THE ASME CONFERENCE ON INFORMATION STORAGE AND PROCESSING SYSTEMS, 2013   2013

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  • Application of Vertically-aligned Carbon Nano-tube for Burnishing Slider in Cleaning Process of Magnetic Disk Surface

    Hiroshi Tani, K. Konish, W. Norimatstu, M. Kusunoki, N. Tagawa

    PROCEEDINGS OF THE ASME CONFERENCE ON INFORMATION STORAGE AND PROCESSING SYSTEMS, 2013   Vol.21, pp.295-300.   2013

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    DOI: 10.007/s00542-014-2135-6

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  • Tribological properties of ultrathin DLC-Coated nanotextured surface on a PET film

    Hiroshi Tani, Hideyuki Takahashi, Shinji Koganezawa, Norio Tagawa

    5th World Tribology Congress, WTC 2013   1   251 - 254   2013

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  • Effect of lubricant materials on light contact between dynamic fly height control sliders and disk surfaces in hard disk drives

    Norio Tagawa, Hiroshi Tani, Kazumi Iwasaki

    5th World Tribology Congress, WTC 2013   2   1728 - 1731   2013

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  • Reduction in Adsorption of Bearing Oil From Fluid Dynamic Bearings of Hard Disk Drive Spindle Motor by Diamagnetism

    Hiroshi Tani, Ryosuke Habara, Norio Tagawa

    IEEE TRANSACTIONS ON MAGNETICS   48 ( 11 )   4152 - 4155   2012.11

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    In this study, we focused on the diamagnetism of ester lubricant oil for fluid dynamic bearings (FDBs) and investigated the effect of a magnetic field on oil vapors. We vaporized the lubricant oil and compared the amount of oil adsorbed on disk surfaces through two slits-one with magnets and the other without a magnet-in a preliminary experiment. As a result, we confirmed that it is possible to reduce the amount of oil adsorbed on a disk surface with the aid of a magnetic field. Based on the preliminary experiment, the outflow of the FDB oil fromthe hard disk drive (HDD) spindle was compared with regard to a narrow clearance with and without the magnetic field gradient of permanent magnets. The amount of outflow was decreased by the magnetic field gradient, and the reduction ratio depended on the environmental temperature. Finally, our results suggest the possibility of a gas seal generated by the magnetic field gradient.

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  • Adhesion and Friction Behaviors of Probes Approaching Magnetic Disk Surfaces

    Hiroshi Tani, Toshiya Mitsutome, Yusuke Tsujiguchi, Masayuki Kanda, Norio Tagawa

    IEEE TRANSACTIONS ON MAGNETICS   48 ( 11 )   4483 - 4486   2012.11

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    In this study, we focused on the adhesion and friction behaviors of probes approaching magnetic disk surfaces. In order to observe these behaviors, a micro-tribotester was newly developed to evaluate the friction and adhesion forces of the ultrathin lubricant film on magnetic disks. The contact area between the spherical glass surface and the disk surface was measured using light intensities and Newton's rings and approximated by the JKR model. An adhesion force corresponding to a pull-off force acted on the interface between the glass surface and the disk surface. The friction coefficients on disks with different lubricant thicknesses were measured and the coefficient was found to decrease as the lubricant thickness increased. The pull-off force gradually increased as lubricant thickness increased.

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  • Fundamental Study of Vapor Lubrication by PFPE Lubricants in Hard Disk Drives

    Norio Tagawa, Hiroshi Tani

    IEEE TRANSACTIONS ON MAGNETICS   48 ( 11 )   4479 - 4482   2012.11

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    Thus far, it has been shown that lubricant depletion occurs at a relatively low temperature of approximately 200 degrees C in thermally assisted magnetic recording (TAMR). Because the lubricant on the disk surface plays an important role in maintaining the reliability and durability of the head-disk interface (HDI), lubricant depletion is one of the critical issues in hard disk drives. Thus, there is a great need to develop technology that supplies lubricant to the HDI as the amount of lubricant decreases, so that the thickness of the lubricant film remains constant. In this study, we conducted a fundamental study of vapor lubrication using perfluoropolyether (PFPE) lubricants as the first step. In other words, we conducted an experimental study to elucidate the fundamental mechanism of vapor lubrication and to investigate the technological feasibility of applying vapor lubrication to hard disk drives. In addition, the possibility of using vapor lubrication in hard disk drives with contact sliders was also investigated. As a result, it was confirmed that vapor lubrication would be useful to overcome the lubricant depletion issue.

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  • Depletion of monolayer liquid lubricant films induced by high-frequency pulsed-laser heating in thermally assisted magnetic recording", Microsystem Technologies Reviewed

    Norio Tagawa, Takao Miki, Hiroshi Tani

    Microsystem Technologies   Vol.18, 2012, pp.1353-1357.   2012.8

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  • Depletion of Monolayer Liquid Lubricant Films Induced by Laser Heating in Thermally Assisted Magnetic Recording Reviewed

    Norio Tagawa, Takao Miki, Hiroshi Tani

    TRIBOLOGY LETTERS   47 ( 1 )   123 - 129   2012.7

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    In this study, lubricant depletion due to high-frequency pulsed-laser heating, with a heating rate of similar to 10(8)-10(9) K/s, was investigated for lubricant films with thicknesses of greater than and less than one monolayer. The conventional lubricants, Zdol2000 and Ztetraol2000, were used. It was found that the critical temperature at which the lubricants begin to deplete was strongly dependent on the lubricant film thickness. For lubricant film thicknesses of less than one monolayer, this temperature was approximately 170 A degrees C higher than that for thicknesses of greater than one monolayer. To analyze the lubricant depletion mechanism, we examined the tested lubricant films, using temperature-programmed desorption (TPD) spectroscopy, in which the heating rate was 0.3 K/s. It was found that the lubricant depletion characteristics could be explained using the experimental TPD results for the tested lubricant films. The depletion mechanism involves the desorption or decomposition of the lubricant molecules, which interact with the diamond-like carbon thin films when the lubricant film thickness is less than one monolayer. Therefore, we concluded that the TPD results were highly effective for evaluating the lubricant depletion characteristics induced by rapid laser heating, even though the heating rates are substantially different.

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  • Adhesion and Friction Properties of Molecularly Thin Perfluoropolyether Liquid Films on Solid Surface Reviewed

    Hiroshi Tani, Norio Tagawa

    LANGMUIR   28 ( 8 )   3814 - 3820   2012.2

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    The adhesion and friction properties of molecularly thin perfluoropolyether (PFPE) lubricant films dip-coated on a diamond-like carbon (DLC) overcoat of magnetic disks were studied using a pin-on-disk-type micro-tribotester that we developed. The load and friction forces were simultaneously measured on a rotating disk surface under an increasing/decreasing load cycle and slow sliding conditions. Experiments were performed using two types of PFPE lubricants: Fomblin Z-tetraol2000S with functional end-groups and Fomblin Z-03 without any end-group. The curves of the friction force as a function of the applied load agree with the curves estimated using the Johnson-Kendall-Roberts (JKR) model. The friction forces on the Z-03 films having different thicknesses were not found to decrease drastically; however, the friction forces on the Z-tetraol film were found to decrease drastically when the film thickness is more than similar to 1.2 nm. This drastic change in the case of the Z-tetraol film is estimated to be affected by the coverage of the lubricant film.

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  • Bonding Mechanism of Perfluoropolyether Lubricant Film with Functional Endgroup on Magnetic Disks by Ultraviolet Irradiation Reviewed

    H. Tani, H. Kitagawa, N. Tagawa

    TRIBOLOGY LETTERS   45 ( 1 )   117 - 122   2012.1

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    We studied the bonding mechanism of ultrathin perfluoropolyether (PFPE) lubricant (Fombline Z-tetraol and Moresco D-4OH) films with hydroxyl end groups by measuring the bonding film thickness after ultraviolet (UV) irradiation. Nonfunctional PFPE lubricants (Z-03 and D2 N) were compared to two types of functional PFPE lubricants. The bonded thickness of both functional lubricants increased after a short period of UV irradiation, whereas that of the nonfunctional lubricants did not increase after the same treatment. This result suggests the occurrence of three kinds of mechanisms. First, Z-tetraol and D-4OH bond because of the photodissociation of the end groups by the UV light. Second, they bond because of the interaction between the end groups and the photoelectron from the carbon surface generated by UV irradiation. Third, they bond because of the photodissociation of the main chain by the UV light. In contrast, the dynamic reaction coordinate calculations suggest that the end groups in the PFPE lubricant dissociate because of the electron capture by the lubricant. As a result, we infer that the bonding of PFPE lubricant films with hydroxyl end groups on magnetic disks occurs by selective dissociation of the end groups because of UV irradiation.

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  • Adhesion and Friction Behavior on Magnetic Disks with Ultrathin Perfluoropolyether Lubricant Film Having Different End-groups Measured using Pin-on-Disk Test

    H. Tani, T. Mitsutome, N. Tagawa

    2012 DIGEST ASIA-PACIFIC MAGNETIC RECORDING CONFERENCE (APMRC)   Vol.49, No.6, pp.2638-2644.   2012

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    In this study, we prepared some kinds of lubricants with different numbers of a hydroxyl end group (Z-03, Z-dol, Z-tetraol, and Z-TMD) and measured the adhesion and friction forces on the disks for different lubricant thicknesses. We successfully obtained these forces as a function of lubricant film thickness. The adhesion and friction forces were smallest on the disk with Z-03; the adhesion force was largest on disks with Z-dol, and the friction force was largest on disks with Z-TMD. Z-03 has no hydroxyl end group; hence, this was assumed to be the reason why Z-03 showed the smallest adhesion and friction forces relative to the other lubricants with hydroxyl end groups. The friction force roughly depended on the lubricant coverage or mobile lubricant thickness in the lubricants with hydroxyl end groups.

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  • Dependence of pin surface roughness for friction forces of ultrathin perfluoropolyether lubricant film on magnetic disks by pin-on-disk test

    H. Tani, Y. Mitsuya, T. Kitagawa, N. Tagawa

    Advances in Tribology   Vol.2012, Article ID 923818, p   2012

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    We fabricated supersmooth probes for use in pin-on-disk sliding tests by applying gas cluster ion beam irradiation to glass convex lenses. In the fabrication process, various changes were made to the irradiation conditions
    these included one-step irradiation of Ar clusters or two-step irradiation of Ar and N2 clusters, with or without Ar cluster-assisted tough carbon deposition prior to N2 irradiation, and the application of various ion doses onto the surface. We successfully obtained probes with a centerline averaged surface roughness that ranged widely from 1.08 to 4.30 nm. Using these probes, we measured the friction forces exerted on magnetic disks coated with a molecularly thin lubricant film. Perfluoropolyether lubricant films with different numbers of hydroxyl end groups were compared, and our results indicated that the friction force increases as the surface roughness of the pin decreases and that increases as the number of hydroxyl end groups increases. © 2012 H. Tani et al.

    DOI: 10.1155/2012/923818

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  • Depletion of monolayer liquid lubricant films induced by laser heating in thermally assisted magnetic recording

    Norio Tagawa, Takao Miki, Hiroshi Tani

    PROCEEDINGS OF THE ASME/STLE INTERNATIONAL JOINT TRIBOLOGY CONFERENCE - 2011   Vol.47, 2012, pp.123-129.   325 - 327   2012

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    In this study, the lubricant depletion caused by laser heating was investigated for lubricant films with thicknesses greater than and less than one monolayer. The conventional lubricants Zdol2000 and Ztetraol2000 were used. It was found that the critical temperature at which lubricants start to deplete by laser heating strongly depends on the lubricant film thickness. To analyze the lubricant depletion mechanism, we carried out temperature programmed desorption (TPD) spectroscopy on the tested lubricant films. It was found that the lubricant depletion characteristics induced by laser heating could be explained using the experimental TPD spectroscopy results for the tested lubricant films. It was also found that the depletion mechanism involved the desorption or decomposition of the lubricant molecules that interacted with the diamond-like carbon thin films when the lubricant film thickness was less than one monolayer.

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  • Experimental Investigation of Local Temperature Increase in Disk Surfaces of Hard Disk Drives Due to Laser Heating During Thermally Assisted Magnetic Recording Reviewed

    Norio Tagawa, Hiroshi Tani, Kenji Ueda

    TRIBOLOGY LETTERS   44 ( 1 )   81 - 87   2011.10

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    In this study, a novel method was developed to evaluate the local temperature increase under steady-state conditions on disk surfaces of hard disk drives due to laser heating during thermally assisted magnetic recording (TAMR). In particular, we evaluated changes in the refractive index and the extinction coefficient of disk substrates due to laser heating by varying the laser power, and determined the relationship between the laser power and the changes in these optical constants. Simultaneously, test disks were heated using a conventional heater, under heating conditions equivalent to those associated with laser heating, by varying the temperature. We evaluated the changes in the optical characteristics of the disk substrates due to heating, and formulated a relationship between the temperature and the changes in the optical characteristics. Then, the local temperature increase due to laser heating under steady-state conditions was evaluated by calibrating both sets of experimental results. In addition, the temperature increase was compared with the numerical simulation results, and good agreement was observed between the experimental and the simulation results. Thus, it was confirmed that, this method is useful and effective for estimating the temperature increase under steady-state conditions in disk surfaces of hard disk drives due to laser heating during TAMR. This method is also a first step toward understanding the occurrence of temperature phenomena in TAMR systems.

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  • Effect of duty ratio of patterned surface on planarization by gas cluster ion beams

    Keisuke Nagato, Noriaki Toyoda, Hiroki Naito, Hiroshi Tani, Yasuo Sakane, Isao Yamada, Masayuki Nakao, Tetsuya Hamaguchi

    Journal of Applied Physics   109 ( 7 )   2011.4

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    We studied the effect of the duty ratio, i.e., the ratio of hill width to pitch, of patterned diamondlike carbon (DLC) surfaces on Ar gas cluster ion beam (GCIB) planarization effect. The patterns of 40 nm depth were fabricated on Si substrates by electron beam lithography and CHF3 reactive-ion etching. The pitch of the line-and-space pattern was 300 nm and three duty ratios were adopted. Then, refilling materials were deposited to 50 nm thickness on the patterned substrates. The test samples were irradiated by Ar-GCIB and the resultant surface profiles were measured by atomic force microscopy. The acceleration energy for one cluster was 20 keV. The dose was set in the range from 5 × 1014 to 5 × 1016 ion/cm2. Although there was a difference in the dose, the patterns clearly disappeared upon irradiating GCIB. The reduction rate of the peak-to-valley height decreased as the width of the hill increased. We indicated that GCIB irradiation is effective for the planarization of patterned surfaces with various duty ratios. © 2011 American Institute of Physics.

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  • Lubricant Depletion Characteristics Induced by Rapid Laser Heating in Thermally Assisted Magnetic Recording Reviewed

    N. Tagawa, H. Tani

    IEEE TRANSACTIONS ON MAGNETICS   47 ( 1 )   105 - 110   2011.1

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    In this study, fundamental research was conducted on lubricant depletion due to rapid laser heating in thermally assisted magnetic recording (TAMR) systems. The effects of lubricant film thickness on lubricant depletion were investigated using a conventional lubricant, Zdol2000. The lubricant depletion characteristics resulting from laser heating were found to largely depend on the lubricant film thickness. Lubricant depletion mechanisms were also studied. In this study, it was found that lubricant depletion is predominantly due to lubricant evaporation for cases in which the lubricant film thickness is greater than one monolayer. In addition, the effect of laser irradiation duration on lubricant depletion was investigated using both continuous and 300-kHz pulsed laser irradiations, since actual TAMR systems require pulsed laser irradiation lasting a few nanoseconds. The differences between the fundamental lubricant depletion characteristics of continuous and pulsed laser irradiations were elucidated on the basis of the experimental results obtained in this study. Furthermore, it has been suggested that diamond-like-carbon (DLC) thin films on the disk surfaces are also affected by rapid laser heating, because the temperature of the films increases to more than 500 K upon laser heating. Therefore, we also studied the damage to DLC thin films due to rapid laser heating and found that the reflectivity of the DLC thin films changed; this change was presumably due to the decrease in the DLC density as well as the asperity in the laser-irradiated region.

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  • Study of Head-Disk Interface for Thermally-Assisted Magnetic Recording : Depletion characteristics of lubricant film induced by laser heating

    MIKI Takao, TAGAWA Norio, TANI Hiroshi

    ITE Technical Report   35   1 - 6   2011

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    To further increase recording density of disk storage drives, thermally-assisted magnetic recording can solve the fundametal issues of thermal fluctuation and is regarded as the keytechnology for achieving recording density of more than 1 Tb/in^2. In this technology, it is suggested that there is critical issues for the ultra-thin liquid lubricant films on the disk surfaces. Because they are heated to high temperature with laser beams. In this study, we focused on the thermal stability of the two lubricant film materials in thermally-assisted magnetic recording. In other words, the behavior of lubricant film under the laser heating was investigated and discussed experimentally. As a result, it was found that the effects of lubricant film thickness as well as the laser irradiation conditions on the lubricant film depletion were clarified. We also considered that the depletion mechanisms of lubricant film compared with the temperature programmed desorption spectroscopy (TPD) results.

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  • Electric-Field-Assisted Dip-Coating for Ultra-Thin PFPE Lubricant Film on Magnetic Disks- Molecular Conformation Change by Electric Field -

    Tani Hiroshi, Kubota Masami, Kanda Masayuki, Terao Motohiro, Tagawa Norio

    Tribology Online   6 ( 1 )   40 - 44   2011

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    The mechanism responsible for the effects of electric fields on the lubricant dip-coating process was investigated by comparing the lubricant film conformations obtained when applying an electric field for different durations. A QA-40 solution was prepared for dip-coating a magnetic disk under two conditions. The lubricant film thickness and surface free energy obtained under the two conditions were compared. It was found that the molecular conformation was changed by the electric field resulting in more end-groups being adsorbed on the disk surface when the electric field is applied during the withdrawal of the disk from the solution than during the normal dip process. As a result, the surface free energy decreased. As a consequence of applying the electric field during dipping and withdrawing, the thickness of the QA-40 layer increased 1 - 3 Å.

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  • Planarization of Nonmagnetic Films on Bit Patterned Substrates by Gas Cluster Ion Beams

    Keisuke Nagato, Hiroaki Hoshino, Hiroki Naito, Tomokazu Hirota, Hiroshi Tani, Yasuo Sakane, Noriaki Toyoda, Isao Yamada, Masayuki Nakao, Tetsuya Hamaguchi

    IEEE TRANSACTIONS ON MAGNETICS   46 ( 6 )   2504 - 2506   2010.6

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    We studied Ar gas cluster ion beam (GCIB) planarization effect on patterned surfaces refilled with Cr, Ta and SiO(2). The patterns of 20 nm in depth were fabricated on Si substrate by using electron beam lithography and CHF(3)-reactive-ion-etching. The bit pattern pitches and the height of peak-to-valley were 150/200/300/400 nm and 20 nm, respectively. Then, refilling materials were deposited 30 nm in thickness on the patterned substrates. The test samples were irradiated by Ar-GCIB and the resultant surface profiles were measured by atomic force microscopy. Acceleration energy for a cluster was 20 keV. The dose was set from 2 x 10(15) to 5 x 10(15) ion/cm(2). Although there was a difference in the dose, the patterns disappeared clearly by irradiating GCIB. The reduction rate of peak-to valley height decreased with decreases of the pattern pitch. We indicated that GCIB irradiation is effective for the planarization of patterned surface refilled with Cr, Ta, and SiO(2).

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  • Surface Characterization and Lubricant Performance on Amorphous Carbon Films Irradiated With Gas Cluster Ion Beams

    Noriaki Toyoda, Isao Yamada, Hiroshi Tani, Yasuo Sakane

    IEEE TRANSACTIONS ON MAGNETICS   46 ( 6 )   1464 - 1466   2010.6

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    Irradiations of gas cluster ion beams (GCIB) on amorphous carbon films formed with chemical vapor deposition (CVD) were performed, and the affinity with lubricant was studied. The surface roughness of as-deposited amorphous CVD carbon film was improved with N(2)-GCIB irradiation. By reducing the formation of multiply charged cluster ions, large crater formations can be minimized, which helps to obtain smooth surface. It was also shown that nitrogen rich surface was formed on the amorphous CVD carbon with N(2)-GCIB. From the study of lubricant affinity and the surface free energy measurements, nitrogen containing functional groups were formed with N(2)-GCIB irradiation, as a result, adhesion between the lubricant and the amorphous CVD carbon film increased.

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  • Study of Molecular Conformation of PFPE Lubricants With Multidentate Functional Groups on Magnetic Disk Surface by Experiments and Molecular Dynamics Simulations

    H. Tani, T. Shimizu, N. Kobayashi, Y. Taniike, K. Mori, N. Tagawa

    IEEE TRANSACTIONS ON MAGNETICS   46 ( 6 )   1420 - 1423   2010.6

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    The molecular height corresponding to monolayer thickness of several types of PFPE lubricants (Z-dol2000, Z-tetraol, A20H2000, ARJ-DS, ARJ-DD, and OHJ-DS) with different molecular structures was estimated from their spreading profiles. The molecular height of Z-dol2000 was smaller than that of Z-tetraol, even though these lubricants had almost equal molecular weights. This result shows that the molecular height of the lubricant with high-polarity end groups was higher than that of the lubricant with low-polarity end groups. ARJ-DD showed higher molecular height than ARJ-DS, because the polarity of the two OH end groups in ARJ-DS was lower than that of the four OH end groups in ARJ-DD. On the other hand, OHJ-DS showed a low molecular height even though it had the highest molecular weight and four OH functional groups. Thus, a lubricant molecule with a low polarity per segment of the main chain has a low molecular height and shows a low degree of conformation on a carbon surface. These experimental results agreed with molecular dynamics (MD) simulation results. Therefore, it can be hypothesized that lubricants with multidentate functional groups having strong polarities do not exhibit a flat conformation on a disk surface because the lubricant molecules form random coil shapes on account of the strong polarity. On the basis of these results, we propose a design rule for lubricant molecules to achieve flat conformation on magnetic disks, i.e., a flat molecular conformation can be achieved on a magnetic disk surface by using molecules that have multisegments with a weak polar function like as OHJ-DS.

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  • Study on Lubricant Depletion Induced by Laser Heating in Thermally Assisted Magnetic Recording Systems: Effect of Lubricant Thickness and Bonding Ratio Reviewed

    Norio Tagawa, Hideki Andoh, Hiroshi Tani

    TRIBOLOGY LETTERS   37 ( 2 )   411 - 418   2010.2

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    In this study, we have carried out fundamental research on lubricant depletion due to laser heating in thermally assisted magnetic recording. In particular, we investigated the effects of lubricant film thickness and lubricant bonding ratio on lubricant depletion. Conventional lubricants Zdol2000 and Ztetraol2000 were used. The lubricant depletion characteristics due to laser heating were found to depend largely on the lubricant film thickness and material. That is, for films thicker than one monolayer, the lubricant depletion depth increased with the laser-irradiation duration, whereas the thickness of the lubricant after laser irradiation on the diamond-like carbon (DLC) films tended to remain at a constant film thickness of one monolayer. The lubricant depletion width gradually increased as the laser irradiation duration increased. The increasing trends for the lubricant depletion width were quantitatively very similar and almost independent of the initial lubricant film thickness. However, for lubricant films with thicknesses less than one monolayer, the lubricant depletion depth was very small. The lubricant depletion width increased remarkably to several hundred micrometers as the laser irradiation duration increased. The lubricant depletion depth and width were much smaller for Ztetraol2000 than Zdol2000. In addition, the lubricant-bonding ratio was found to greatly affect the lubricant depletion characteristics due to laser heating. In other words, the lubricant depletion depth and width decreased as the bonding ratio increased. The lubricant depletion mechanism involves the evaporation of mobile lubricant molecules when the maximum attained temperature is less than 100 A degrees C. Another suggested lubricant depletion mechanism involves the thermocapillary stress effect, which is induced by the disk surface temperature gradient resulting from the non-uniformity of the laser spot intensity distribution.

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  • Conformation and fundamental properties of novel lubricant TA-30 for near contact magnetic recording Reviewed

    N. Tagawa, H. Tani

    Tribo. lett   Vol.40, No.1, 2010, pp.131-137.   2010.1

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  • S1604-1-5 Study on Hysteresis Behavior of Thermal Fly-Height Control Sliders in Hard Disk Drives

    TAGAWA Norio, MAENO Satoshi, TANI Hiroshi

    The proceedings of the JSME annual meeting   2010   131 - 132   2010

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    In this study, we conducted experiments to investigate the dynamic touchdown and takeoff hysteresis behavior of TFC sliders. The effect of lubricant film thickness on hysteresis dynamics of the TFC sliders was investigated in the experiments. We also performed similar experiments related to the hysteresis behavior of sliders without TFC and discussed the differences between the slider hysteresis dynamics for the various cases. A specific and interesting phenomenon was observed regarding the slider touchdown in the case of lubricant films with large thicknesses, suggesting the feasibility of developing surfing recording HDI based on thick lubricant films.

    DOI: 10.1299/jsmemecjo.2010.5.0_131

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  • Electric Field Assisted Dip-coating Process of Ultra-thin PFPE Lubricant Film on Magnetic Disks

    Hiroshi Tani, Masami Kubota, Masayuki Kanda, Motohiro Terao, Norio Tagawa

    JOURNAL OF ADVANCED MECHANICAL DESIGN SYSTEMS AND MANUFACTURING   4 ( 1 )   397 - 404   2010

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    The influence of an electric field on the dip-coating process was studied by using the lubricants Z-tetraol, D-4OH, TA-30, and QA-40. The electric field facilitated the adsorption of lubricant molecules onto the disk surface. It also resulted in an increase in the lubricant film thickness. The surface free energy and molecular height of the Z-tetraol lubricant film were not affected by the electric field; however, they decreased in the case of other lubricant films. To elucidate these results, we estimated that the molecular conformation of the lubricants changed due to the electric field and that the OH end-groups aligned to the carbon surface. These results suggest the possibility of resistance to outgas contamination and humidity through electric field assisted dip (EFAD) coating.

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  • Electric Field Assisted Dip-coating Process of Ultra-thin PFPE Lubricant Film on Magnetic Disks

    Hiroshi Tani, Masami Kubota, Masayuki Kanda, Motohiro Terao, Norio Tagawa

    JOURNAL OF ADVANCED MECHANICAL DESIGN SYSTEMS AND MANUFACTURING   4 ( 1 )   397 - 404   2010

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    The influence of an electric field on the dip-coating process was studied by using the lubricants Z-tetraol, D-4OH, TA-30, and QA-40. The electric field facilitated the adsorption of lubricant molecules onto the disk surface. It also resulted in an increase in the lubricant film thickness. The surface free energy and molecular height of the Z-tetraol lubricant film were not affected by the electric field; however, they decreased in the case of other lubricant films. To elucidate these results, we estimated that the molecular conformation of the lubricants changed due to the electric field and that the OH end-groups aligned to the carbon surface. These results suggest the possibility of resistance to outgas contamination and humidity through electric field assisted dip (EFAD) coating.

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  • Electric Field Assisted Dip-coating Process of Ultra-thin PFPE Lubricant Film on Magnetic Disks

    Hiroshi Tani, Masami Kubota, Masayuki Kanda, Motohiro Terao, Norio Tagawa

    JOURNAL OF ADVANCED MECHANICAL DESIGN SYSTEMS AND MANUFACTURING   4 ( 1 )   397 - 404   2010

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    The influence of an electric field on the dip-coating process was studied by using the lubricants Z-tetraol, D-4OH, TA-30, and QA-40. The electric field facilitated the adsorption of lubricant molecules onto the disk surface. It also resulted in an increase in the lubricant film thickness. The surface free energy and molecular height of the Z-tetraol lubricant film were not affected by the electric field; however, they decreased in the case of other lubricant films. To elucidate these results, we estimated that the molecular conformation of the lubricants changed due to the electric field and that the OH end-groups aligned to the carbon surface. These results suggest the possibility of resistance to outgas contamination and humidity through electric field assisted dip (EFAD) coating.

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  • S1604-1-4 Study of Molecular Conformation of PFPE Lubricants with Multidentate Functional Groups on Magnetic Disk Surface

    TANI Hiroshi, Shimizu Tsuyoshi, Kobayashi Nagayoshi, Taniike Yoshihiro, Mori Kazuya, TAGAWA Norio

    The proceedings of the JSME annual meeting   2010   129 - 130   2010

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    The molecular height corresponding to monolayer thickness of several types of PFPE lubricants (Z-do12000, Z-tetraol, A20H2000, ARJ-DS, ARJ-DD, and OHJ-DS) with different molecular structures was estimated from their spreading profiles. The molecular height of Z-do12000 was smaller than that of Z-tetraol, even though these lubricants had almost equal molecular weights. This result shows that the molecular height of the lubricant with high-polarity end groups was higher than that of the lubricant with low-polarity end groups. ARJ-DD showed higher molecular height than ARJ-DS, because the polarity of the two OH end groups in ARJ-DS was lower than that of the four OH end groups in ARJ-DD. On the other hand, OHJ-DS showed a low molecular height even though it had the highest molecular weight and four OH functional groups. Thus, a lubricant molecule with a low polarity per segment of the main chain has a low molecular height and shows a low degree of conformation on a carbon surface. These experimental results agreed with molecular dynamics (MD) simulation results. Therefore, it can be hypothesized that lubricants with multidentate functional groups having strong polarities do not exhibit a flat conformation on a disk surface because the lubricant molecules form random coil shapes on account of the strong polarity. On the basis of these results, we propose a design rule for lubricant molecules to achieve flat conformation on magnetic disks, i.e., a flat molecular conformation can be achieved on a magnetic disk surface by using molecules that have multisegments with a weak polar function like as OHJ-DS.

    DOI: 10.1299/jsmemecjo.2010.5.0_129

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  • Study on Lubricant Depletion Induced by Laser Heating in Thermally Assisted Magnetic Recording Systems; Effect of Lubricant Thickness Reviewed

    Norio Tagawa, Hideki Andoh, Hiroshi Tani

    PROCEEDINGS OF THE ASME/STLE INTERNATIONAL JOINT TRIBOLOGY CONFERENCE - 2009   423 - 425   2010

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    In this study, fundamental research on lubricant depletion due to laser heating in thermally assisted magnetic recording was conducted. In particular, the effect of lubricant film thickness on lubricant depletion was investigated. The conventional lubricant Zdol2000 was used. As a result, it was found that the lubricant depletion characteristics due to laser heating depend largely on the lubricant film thickness. In addition, it was suggested that the lubricant depletion mechanism involves the evaporation of the mobile lubricant molecules, when the maximum attained temperature is not very high. Another suggested lubricant depletion mechanism involves the thermocapillary stress effect induced by the disk surface temperature gradient resulting from the non-uniformity of the laser spot intensity distribution.

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  • Conformation of Ultrathin PFPE Lubricants With Different Structure on Magnetic Disks-Direct Observation and MD Simulation

    Hiroshi Tani, Kei Sakamoto, Norio Tagawa

    IEEE TRANSACTIONS ON MAGNETICS   45 ( 11 )   5050 - 5054   2009.11

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    Three types of PFPE lubricants (Z-tetraol, TA-30, and D-4OH) with different molecular structures were coated on magnetic disks and the conformations of these films were studied by atomic force microscopy using a fluoride-coated probe. The molecular conformations of these lubricant films were found to be different from each other. The Z-tetraol film showed the highest molecular height and lowest coverage among these lubricants. The TA-30 film showed a double-layer structure and the highest coverage among the lubricant films. The D-4OH film showed a monolayer structure and higher coverage than the Z-tetraol film. These observed were in agreement with the results of molecular dynamics simulations. In these simulations, the TA-30 film showed the highest coverage and lowest molecular height among the three lubricant films because the TA-30 molecules did not form a random coil shape and were adsorbed rigidly on the disk surface. The Z-tetraol molecules were adsorbed and formed a random coil shape. The D-4OH molecules were also adsorbed and formed a spiral shape.

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  • Advanced Head-Disk Interface System Assisted by Gas PFPE Lubrication

    Hiroyuki Matsumoto, Hiroshi Tani

    IEEE TRANSACTIONS ON MAGNETICS   45 ( 11 )   5077 - 5081   2009.11

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    Advanced head-disk interface (HDI) system assisted by gas perfluoropolyether (PFPE) lubrication is discussed in this paper. It is known that the lubricant spins off under the high rotation speed and high temperature. The lubricant redistribution after long-term head seeking with near-contact flying was studied. The spinoff and the redistribution of lubricant will be serious issues for the reliability of the hard disk drives. Our proposed HDI system shows high performance without the lubricant spinoff and redistribution. This is achieved by dripping only a small amount of lubricant on the suspension. This lubricant evaporates under high temperature and is adsorbed on to the disk surface. As a result, the spinoff, the redistribution, and the head contamination were significantly reduced. The lubricant on a magnetic disk could be maintained for a long time. The amount of this lubricant was optimized to maintain the constant thickness thorough the balance of the supplying and the decreasing. It was confirmed that the lubricant on the disks in this new HDI system maintained for about 10 000 hours at 70 degrees C.

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  • Electric-Field-Assisted Dip Coating Process of Ultrathin PFPE Lubricant Film for Magnetic Disks Reviewed

    Hiroshi Tani, Masami Kubota, Masayuki Kanda, Motohiro Terao, Norio Tagawa

    IEEE TRANSACTIONS ON MAGNETICS   45 ( 10 )   3636 - 3639   2009.10

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    In this paper, the influence of the electric field on the dip-coating process was studied by using lubricants Z-tetraol and TA-30. The electric field assisted the adsorption of both lubricant molecules on the disk surface. This electric field also resulted in an increase in the lubricant film thickness. A positive electric field increased the bonded ratio of the lubricant film. The surface-free energy, step height, and head-disk clearance of the Z-tetraol lubricant film were not affected by the electric field; however, those of the TA-30 lubricant film were improved by the electric field. By molecular dynamics simulation, we confirmed that the molecular mobility of the solution increased by applying the electric field. The lubricant molecules in the solution, which show higher mobility, should have more opportunity to adsorb onto a disk surface. These results show the possibility of reducing the head flying height by the electric-field-assisted dip (EFAD) coating process.

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  • Planarization of Bit-Patterned Surface Using Gas Cluster Ion Beams

    N. Toyoda, T. Hirota, K. Nagato, H. Tani, Y. Sakane, T. Hamaguchi, M. Nakao, I. Yamada

    IEEE TRANSACTIONS ON MAGNETICS   45 ( 10 )   3503 - 3506   2009.10

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    The planarization of the bit-patterned surface using gas cluster ion beams (GCIBs) was studied. By applying the features of gas cluster ions, such as low-energy irradiation and surface smoothing effects, it is possible to carry out effective smoothing of a patterned surface. We fabricated a dot pattern on the Si substrate as a model structure for bit-patterned media by electron beam lithography and inductive coupled plasma etching. A carbon overcoat covered the Si dots. On Ar-GCIB irradiation at an acceleration voltage of 20 kV, the Si dots with a diameter of 150 nm were planarized. The required ion dose for planarization was 5 x 10(14) ions/cm(2). The cross-sectional transmission electron microscope images showed that only the carbon overcoat layer was planarized without a change in the structure of Si dots. Etching depth of the overcoat increased linearly with the ion dose, indicating good reproducibility of the method with precise control of residual thickness.

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  • Study of Lubricant Depletion Induced by Laser Heating in Thermally Assisted Magnetic Recording Systems-Effect of Lubricant Film Materials

    Norio Tagawa, Ryo Kakitani, Hiroshi Tani, Naoyasu Iketani, Ikuo Nakano

    IEEE TRANSACTIONS ON MAGNETICS   45 ( 2 )   877 - 882   2009.2

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    Thermally assisted magnetic recording (TAMR) is one of the novel technologies that are employed for achieving magnetic recording densities higher than 1 Tb/in(2). With regard to this novel technology, it has been suggested that there exists a critical head-disk interface (HDI) issue associated with the use of ultrathin liquid lubricant films on the disk surface. This problem is attributed to the fact that these films are heated to high temperatures by using laser beams in order to reduce magnetic coercivity. In this study, a fundamental research on the lubricant depletion caused due to laser heating in TAMR systems was conducted. That is, the effect of lubricant film materials on lubricant depletion was investigated. In this experimental study, four types of lubricant film materials-Zdol2000, Zdol4000, Ztetraol2000, and A20H2000-were used, and the differences in the characteristics of lubricant depletion for each tested lubricant film were investigated. The effect of the molecular weight as well as the end group of the lubricant on the lubricant depletion was discussed and clarified by analyzing the obtained experimental results. In addition, it was found that the depletion characteristics of ultrathin liquid lubricant films could be explained by using experimental results obtained from the thermogravimetric analysis for each bulk lubricant material.

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  • Direct Observation of PFPE Lubricants on Magnetic Disks

    Hiroshi Tani, Norio Tagawa

    IEEE TRANSACTIONS ON MAGNETICS   45 ( 2 )   862 - 866   2009.2

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    Perfluoropolyether lubricant films on magnetic disks were observed by means of atomic force microscopy (AFM) with a fluoride-coated probe. The lubricant films could be observed directly because the adhesion force was decreased by the anti-wetting effect of the fluoride coating on the probes. We compared the molecular conformation of Z-dol (Mw: 2000, 3000, 6000, 8000) with that of Z-tetraol. Thus, we found that the film coverage of a lubricant with high molecular weight exhibited varying (i.e., higher and lower) step heights of the lubricant film boundary. The Z-tetraol film exhibited higher coverage and the higher step height as compared to Z-dol2000. To further study the step height measured by means of atomic force microscopy, we compared the step height with the shoulder height of the spreading profiles of the films. The step heights were almost equal to the shoulder height. We observed the lubricant film after shearing by using contact scanning mode atomic force microscopy. The coverage of the sheared lubricant film increased higher than the initial coverage before shearing. Subsequently, the lubricant molecular conformation was varied due to the shearing, and the coverage was increased.

    DOI: 10.1109/TMAG.2008.2010655

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  • S1604-1-2 Study of slider hysteresis behavior with dynamic flying height control

    MAENO Satoshi, TAGAWA Norio, TANI Hiroshi

    The proceedings of the JSME annual meeting   2009   211 - 212   2009

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    Recently, head-disk-interface(HDI) spacmg in hard disk drives(HDD) has been decreased to as low as 5 nm in order to achieve an ultra-high magnetic recording density. With the increase in magnetic recording density, the HDI spacing of the head has been reduced. To reduce the magnetic spacing, the active head slider with micro-thermal actuator was developed. The magnetic spacing of these sliders can be controlled in-situ during operation of the drive. The goal of this research is to clarify the slider hysteresis behavior of dynamic flying height (DFH) sliders. In this study, the slider hysteresis behavior was compared, varying the disk roughness. As a result, it was found the slider hysteresis behavior depends on the disk roughness.

    DOI: 10.1299/jsmemecjo.2009.5.0_211

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  • Study of slider-defect interaction at ultralow flying height by dynamic flying height control

    H. Tani, M. Kanda, M. Kubota, N. Tagawa

    Journal of Applied Physics   105 ( 7 )   2009

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    In this study, the interaction of the magnetic head slider and magnetic disk defects were studied as the function of the head flying height controlled by the dynamic flying height (DFH) control method. In the conventional glide test, the flying height is set as a function of the rotational velocity. However, in the glide test using the DFH control method, the flying height could be set as a function of DFH power on a constant rotational velocity. A magnetic disk with two types of defects-a crater and a 5 nm bump-was prepared. The acoustic emission (AE) signal at the slider-defect contacts from the conventional glide test and the DFH glide test were then compared. The results of the experiment indicated that the DFH glide test could detect these defects at a few nanometers flying height, but the conventional glide test could not detect them. This was because the AE signal burst below a flying height of 3 nm. The AE signal output of the DFH glide test was higher than that of the conventional glide test, and the AE signal of the defect contact increased at a greater rotational velocity. It was concluded that the DFH control glide testing was one of the most important techniques for the future high-density recording disks. © 2009 American Institute of Physics.

    DOI: 10.1063/1.3061827

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  • Advanced head disk interface system assisted by gas PFPE lubrication

    H. Matsumoto, T. Tani

    Asia-Pacific Magnetic Recording Conference, Digest of APMRC 2009   Vol.6, No.1, 2011, pp.96-100.   2009

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    Advanced head disk interface (HDI) system assisted by gas Perfluoropolyether (PFPE) lubrication was discussed in this paper. It is known that the lubricant spins-off under the high-rotation-speed and high temperature. Our proposing HDI system showed high performance without the lubricant spin-off and redistribution. That was to drip only small amount of lubricant on the slider suspension. This lubricant was evaporated into the head disk interface, and that in gas phase was adsorbed onto disk surface, where its thickness was decreased. As the results, the spin-off, the redistribution and also the head contamination were significantly reduced. The lubricant on magnetic disk is expected to be maintained for long time.

    DOI: 10.1109/APMRC.2009.4925386

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  • Planarization of amorphous carbon films on patterned substrates using gas cluster ion beams

    Noriaki Toyoda, Keisuke Nagato, Hiroshi Tani, Yasuo Sakane, Masayuki Nakao, Tetsuya Hamaguchi, Isao Yamada

    Journal of Applied Physics   105 ( 7 )   2009

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    Surface planarization and modification of a patterned surface were demonstrated using gas cluster ion beam (GCIB). Grooves with 100-400 nm intervals were formed on amorphous carbon films using focused ion beams to study the special frequency dependence of the planarization. Also, line and space patterns were fabricated on Si substrates, and amorphous carbons were deposited as a model structure of discrete track media. Subsequently, surface planarization using Ar-GCIB was carried out. After GCIB irradiations, all of the grooves were completely removed, and a flat surface was realized. And it showed that GCIB irradiation planarized grooves without huge thickness loss. From the power spectrum density of an atomic force microscope, GCIB preferentially removed grooves with small intervals. It was found from energy dispersive x-ray spectroscopy that surface planarization without severe damage in the amorphous carbon and magnetic layers was carried out with GCIB. © 2009 American Institute of Physics.

    DOI: 10.1063/1.3073665

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  • S1604-1-4 Study of Head-Disk Interface for Thermally Assisted Magnetic Recording Systems : Effect of Lubricant Thickness and Bonded Ratio

    TAGAWA Norio, ANDOH Hideki, TANI Hiroshi

    The proceedings of the JSME annual meeting   2009   215 - 216   2009

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    Language:Japanese   Publisher:The Japan Society of Mechanical Engineers  

    In this study, fundamental research on lubricant depletion due to laser heating in thermally assisted magnetic recording was conducted. In particular, the effect of lubricant film thickness as well as lubricant bonded ratio on lubricant depletion was investigated. The conventional lubricant Zdol2000 was used. As a result, it was found that the lubricant depletion characteristics due to laser heating depend largely on the lubricant film thickness and the lubricant film bonded ratio. In addition, it was suggested that the lubricant depletion mechanism involves the evaporation of the mobile lubricant molecules, when the maximum attained temperature is not very high. Another suggested lubricant depletion mechanism involves the thermocapiflary stress effect induced by the disk surface temperature gradient resulting from the non-uniformity of the laser spot intensity distribution.

    DOI: 10.1299/jsmemecjo.2009.5.0_215

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  • S1604-1-5 Study of Head-Disk Interface for Laser-Assisted Magnetic Recording : Effect of Lubricant Film Materials

    MIKI Takao, TAGAWA Norio, TANI Hiroshi

    The proceedings of the JSME annual meeting   2009   217 - 218   2009

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    Language:Japanese   Publisher:The Japan Society of Mechanical Engineers  

    To further increase recording density of disk storage drives, laser-assisted magnetic recording can solve the fundamental programs of thermal fluctuation and is regarded as the keytechnology for achieving recording density of more than 1 Tb/in^2. In this technology, it is suggested that there is serious issues for the ultra-thin liquid lubricant films on the disk surfaces. Because they are heated to high temperature with laser beams. In this study, we focused on the thermal stability of the three lubricant film materials in laser-assisted magnetic recording. In other words, the behavior of lubricant film under the laser heating was investigated and discussed experimentally. As a result, it was found that the effects of lubricant materials as well as the laser irradiation conditions on the lubricant film depletion were clantied.

    DOI: 10.1299/jsmemecjo.2009.5.0_217

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  • Study of Gas Cluster Ion Beam Planarization for Discrete Track Magnetic Disks

    Keisuke Nagato, Hiroshi Tani, Yasuo Sakane, Noriaki Toyoda, Isao Yamada, Masayuki Nakao, Tetsuya Hamaguchi

    IEEE TRANSACTIONS ON MAGNETICS   44 ( 11 )   3476 - 3479   2008.11

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    We studied planarization of carbon overcoat by gas cluster ion beam (GCIB) for discrete track magnetic disks. We fabricated discrete tracks with variant pitches by focused ion beam on a 30-nm-thick carbon overcoat deposited on magnetic disks, and we planarized them with an Ar GCIB using lateral sputtering effect. It was found that planarization by GCIB was more effective for lower wavelengths than for those with a few hundreds nanometers. On the discrete tracks with 100-nm pitch and 20-nm depth, the initial peaks and valleys were removed by GCIB; however, on the ones with over 200-nm pitch, the initial peaks and valleys remained though the heights were drastically decreased. These results indicate the capability of GCIB planarization as a process for the discrete track media. Furthermore, cross sections were observed by transmission electron microscopy. The GCIB with relatively low dose could also planarize the 120-nm-pitch carbon tracks without etching the magnetic layer.

    DOI: 10.1109/TMAG.2008.2001618

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  • Density Dependence of Carbon/Magnetic Layer for Corrosion/Scratch Resistance on Head-Disk-Interface

    H. Tani, A. Shoda

    IEEE TRANSACTIONS ON MAGNETICS   44 ( 11 )   3714 - 3717   2008.11

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    Each relative density of carbon overcoat and upper magnetic layer of perpendicular magnetic disks with different corrosion and scratch resistance was measured by transmission electron microscopy electron energy loss spectroscopy (TEM EELS). Corrosion resistance depends on the relative density of both layers, the carbon overcoat and the upper magnetic layer with higher density showed larger corrosion resistance. Scratch resistance did not depend on the density of carbon overcoat, but depended on the density of the upper magnetic layer. Higher density showed higher scratch resistance. This relationship between the relative density of upper magnetic layer and the scratch resistance suggests the deformation of upper magnetic layer affects to scratch damage. As the result of this study, the density evaluation by TEM EELS is useful to estimate the corrosion/scratch resistance tendency of perpendicular magnetic disks, and the higher density of upper magnetic layer is needed to improve the scratch robustness of perpendicular magnetic disks.

    DOI: 10.1109/TMAG.2008.2001884

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  • Contact hysteresis behavior of textured pad slider in head-disk interface

    Hiroshi Tani, Kennosuke Goshi, Kenji Suzuki, Tetsuya Hamaguchi

    IEEE TRANSACTIONS ON MAGNETICS   42 ( 10 )   2525 - 2527   2006.10

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    Takeoff performance of the magnetic head slider on head-disk interface is influenced by a stick-slip vibration of a slider enhanced by the friction of the head-disk contact. We studied this phenomenon using a simulation of slider vibration based on stick-slip analysis. Obvious degradation in the takeoff performance was estimated for the disks with large friction through the simulation of the contact hysteresis defined by the difference of takeoff height and touchdown height. In order to confirm that simulation result, several types of textured pad sliders by focused ion beam fabrication were evaluated by touchdown and takeoff measurement. These pad sliders were textured at a small area near the trailing edge on a trailing pad as a corresponding contact area. The texturing of a trailing pad did not disturb the flyability of slider because the textured area was very small and did not decrease the slider fly height. As a result, the contact hysteresis of textured sliders became smaller as a function of contact area and improved the takeoff performance.

    DOI: 10.1109/TMAG.2006.878644

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  • Study of head takeoff phenomenon influenced by stick-slip vibration of slider on head-disk interface

    H Tani, K Goshi, T Hamaguchi, K Suzuki

    JOURNAL OF APPLIED PHYSICS   99 ( 8 )   2006.4

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    Takeoff performance of the magnetic head slider on head-disk interface is influenced by a stick-slip vibration of slider enhanced by the friction of head-disk contact. We studied this phenomenon using altitude test and a simulation of slider vibration based on stick-slip analysis. Obvious degradation in the takeoff performance was observed for the disks with small roughness. This phenomenon can be explained using a simple stick-slip model of slider vibration enhanced by friction force, and investigated through the evaluation of the pressure hysteresis defined by the difference of takeoff pressure and touchdown pressure. Hysteresis simulation based on the stick-slip model revealed that large stick-slip vibration induces hysteresis for the disk with low roughness. We confirmed by the experiment and simulation that this stick-slip vibration of slider continues in the case of large friction coefficient after one slider-disk contact. We also confirmed that, slider-disk contact in low fly height occurs due to the trigger which the slider contacts on lubricant pooling. Reduction of friction force was found to be effective to improve the pressure hysteresis and takeoff performance. (C) 2006 American Institute of Physics.

    DOI: 10.1063/1.2172533

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  • Spin-off behavior of perfluoropolyether lubricant on magnetic disks

    H Tani, H Matsumoto

    TRIBOLOGY INTERNATIONAL   36 ( 4-6 )   397 - 403   2003.4

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    Spin-off model was suggested from the viewpoint of lubricant molecule migration. Lubricant molecules move from the inner diameter to outer diameter on the magnetic disk when the air shear force and the centrifugal force act on the molecules. The spin-off behavior was calculated using this model, and the experimental results were clearly explained by the results of that simulation. In addition, the adsorption energy of lubricant molecules onto magnetic disk was determined as the activation energy from the measurement of replenishing velocity of lubricant film. The adsorption energies of perfluoropolyether lubricant molecule were different from the nitrogenated amorphous carbon overcoat and the DLC overcoat. (C) 2003 Elsevier Science Ltd. All rights reserved.

    DOI: 10.1016/S0301-679X(02)00215-3

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  • Catastrophic damage of magnetic recording disk caused by slider-disk impact during loading/unloading

    Mitsuhiro Shoda, Hiroshi Tani

    IEEE Transactions on Magnetics   39 ( 2 )   893 - 897   2003

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    Catastrophic damage of a disk caused by impact between a slider and a disk during loading/unloading is investigated using many variations of disk samples with the different scratch resistances. At first, the accelerated loading/unloading test condition to increase disk damage was studied as the function of disk-runout during a disk rotating, rotational speed of a disk, and sweep velocity of a slider using disk samples with the same scratch resistance. Next, in accelerated test conditions, many kinds of disk samples with different scratch resistances were tested to find a relation between disk damage and scratch resistance of thin films. Flyability of a slider over a disk during a slider sweeping in these tests was monitored using an acoustic emission transducer. Disk surface and slider surface after the test was observed using an optical microscope and an optical surface analyzer. Scratch resistance of a disk was measured using a newly developed high-speed scratch tester. As a result, film-peeling damage was broken out at the loading position of a disk with increasing disk-runout. Film-peeling damage was broken out much more with decreasing scratch resistance of a disk. When scratch resistance of a disk was lower, flyability became bad suddenly during a slider sweeping over a disk
    a sweep zone of the disk surface after the test shows damage, such as cross scratches. It is found that disk damage results in not only environmental contamination but also scratch resistance of a disk. This damage is broken out catastrophically. Finally, a mechanism of catastrophic damage is discussed.

    DOI: 10.1109/TMAG.2003.808916

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  • Spreading mechanism of PFPE lubricant on the magnetic disks

    H Tani, H Matsumoto

    JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME   123 ( 3 )   533 - 540   2001.7

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ASME-AMER SOC MECHANICAL ENG  

    The lubrication mechanism when the magnetic head is sliding on the magnetic disk in the drag test with cyclic interval rest periods, is discussed. A long rest period decreased the wear of disks and friction force. This result indicated that the reflow of lubricant into the contact areas decreased the wear of texture asperities, Next, the molecular spreading behavior of a lubricant plm was calculated by Monte Carlo method to estimate the effect of lubricant recovering velocities. The lubricant replenishment into a thinner lubricant area made by an etching technique was measured The measured profiles of lubricant replenishment were approximately agreed with the calculated profiles using a spreading model. It was clearly estimated that the reflow velocities changed in various cases of the environmental temperature, the radius of removal lubricant area, and the thickness of the lubricant films. Experimentally, the dependencies of temperature, the radius of removal lubricant area, and the lubricant thickness were measured in the drag test. This lubricant-spreading model adequately explained these results.

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  • Adsorption Properties of Lubricant and Additive for High Durability of Magnetic Disks. Reviewed

    H. Matsumoto, H. Tani

    IEEE Trans. on Magn.   Vol.37, No4, pp.3059-3061.   2001.4

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  • Adsorption Properties of Lubricant and Additive for High Durability of Magnetic Disks. Reviewed

    H. Matsumoto, H. Tani

    IEEE Trans. on Magn.   Vol.36, No5, pp.2680-2682.   2000.5

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  • Ultrafilterd Perfluoropolyeter Lubricant under Molecular Weight Distribution Control Reviewed

    T. Nakakawaji, M. Ishida, Y. Ito, H. Matsumoto, H. Tani, H. Ishihara

    STLE Trib. Trans.   Vol.43, No.4, pp.671-676.   2000.4

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  • Design of carbon surface functional groups on the viewpoint of lubricant layer structure

    Toru Yatsue, Heigo Ishihara, Hiroyuki Matsumoto, Hiroshi Tani

    Tribology Transactions   43 ( 4 )   802 - 808   2000

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    Chemical modification technique with X-ray photoelectron spectroscopy has been used for a quantitative analysis of surface functional groups of the carbon overcoats. As the nitrogen content in the carbon overcoat layer increases, the total abundance of functional groups on the carbon overcoat surface increases. The increase of the functional groups leads to an increase of a physisorbed lubricant layer ratio. Increase of the physisorbed layer ratio on the carbon overcoat surface showed a higher durability on the head/disk interface, and decreased the spin-off of the lubricant on a high rotation of the disk. The increase of the physisorbed layer leads to a higher recovery of the lubricant defect by the wear, and the increase of functional groups on the carbon overcoat surface leads to a stronger interaction of the lubricant with the carbon overcoat surface is estimated.

    DOI: 10.1080/10402000008982411

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  • Observation of PFPE lubricant film on magnetic disk surface by atomic force microscopy

    Hiroshi Tani

    IEEE Transactions on Magnetics   35 ( 5 )   2397 - 2399   1999

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    We observed how PFPE lubricant film formed to magnetic disk surface using AFM with a fluoride coated probe. We found that PFPE lubricant did not uniformly cover the carbon protective surface but concentrated in valleys of surface roughness. The lubricant film has one to two step structure and the first step height is almost as same as the radius of molecular gyration. After the pin-on-disk test, the lubricant step height decreased and the coverage increased, compared to the initial state. © 1999 IEEE.

    DOI: 10.1109/20.800837

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  • Friction and Wear Behavior of Magnetic Recording Heads with Textured Air Bearing Surface Overcoats Reviewed

    H. Tani, Y. Ogawa

    J. Magn. Soci. Japan   21, S2, pp95-98.   1997

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  • Performance of Hard DLC Protective Film Prepared by PECVD Method for Thin Film Magnetic Disk

    Keigo Iechika, Yuichi Kokaku, Mitsuyoshi Ootake, Katsuo Abe, Hiroshi Tani

    IEEE Transactions on Magnetics   30 ( 6 )   4134 - 4136   1994

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    Performance of diamondlike carbon (DLC) film prepared by PECVD method has been investigated as the protective film of rigid thin film disk. An in-line sputtering PECVD multilayer deposition system was used for preparation of disk samples. The disks were found to be superior to those disks with conventionally sputtered carbon films in many points such as high durability against CSS tests, smooth coverage over the irregular points of magnetic layer, and as a result, good corrosion resistance even at the thickness of 15 nm or less. © 1994, American Institute of Physics

    DOI: 10.1109/20.334013

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  • 機械設計学入門

    ( Role: Sole author)

    数理工学社  2020.9 

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  • トライボトロニクス:―摩擦摩耗のアクティブ制御と摩擦発電・センサへの応用―

    谷 弘詞

    トライボロジスト 63(4), 260-268,  2018.4 

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  • トライボロジー分野の工学実験―転がり軸受の摩擦・摩耗

    呂 仁国, 谷 弘詞

    トライボロジスト 62 (5), 346-349,  2017.5 

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  • DEVELOPMENT OF PHOTOELECTRON-ASSISTED CHEMICAL VAPOR DEPOSITION Reviewed

    Kansai University  2017.3 

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  • 分子薄膜潤滑膜のトライボロジー

    谷 弘詞

    機械の研究 67 (8), 666-671,  2015.8 

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  • 物理障害を起こしたHDDのデータ復旧技術

    谷弘詞( Role: Sole author)

    月刊トライボロジー  2014 

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  • SiC表面分解法で作製したCNT/SiC複合材の摩擦特性と磁気ディスクバーニッシュヘッドへの応用

    谷弘詞( Role: Sole author)

    セラミックス 48 (9), 718-722,  2013.9 

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  • 磁気ディスク潤滑膜の紫外線処理

    谷弘詞( Role: Sole author)

    トライボロジスト 58 (3), 145-150,  2013.3 

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  • ヘッド・ディスク・インターフェースにおけるトライボロジーコーティング

    谷弘詞

    月刊トライボロジー 27 (1), 41-43,  2013.1 

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  • 磁気ディスクのコンタクトヒステリシス現象

    谷 弘詞, 合志健之助, 鈴木健司, 濱口哲也

    トライボロジー会議予稿集 2006-5,p.C 28,  2006 

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  • HDIにおける減圧ヒステリシス挙動に及ぼすヘッドテクスチャの効果

    谷 弘詞, 合志剣ノ助, 鈴木健司, 濱口哲也

    トライボロジー会議予稿集 2005-11, p.E37.  2005 

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  • HDIにおける気圧ヒステリシス挙動の研究

    谷 弘詞, 小川陽子

    トライボロジー会議予稿集 2004-11, p.2E10.  2004 

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  • 極薄膜DLC保護膜の表面構造と耐摩耗性

    谷 弘詞, 正田光広

    トライボロジー会議予稿集 2003-5, p.C9.  2003.5 

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  • 磁気ディスク媒体のHDI技術動向 (特集1 ハードディスクドライブ)

    谷 弘詞

    月刊トライボロジー 17 (3) ,15-17,  2003.3 

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  • PFPE潤滑剤の熱安定

    トライボロジー会議予稿集 2002-10, 289-290,  2002.10 

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  • ヘッド・ディスク・インターフェースに関するナノトライボロジー

    谷弘詞

    科学と工業 15 (11), 32-34,  2001.11 

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  • AFMを用いた磁気ディスク潤滑剤の評価

    (トライボロジスト)

    トライボロジスト 46 (6), 433-438,  2001.6 

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MISC

  • 情報知能精密機器部門における取組み < 特集> 学会横断テーマ 「機械・インフラの保守・保全, 信頼性強化」

    谷 弘詞

    日本機械学会誌   126 (1250), 28-29   2023.1

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  • 摩擦帯電センサの転がり軸受への応用

    谷 弘詞

    トライボロジスト   68 ( 12 )   848 - 853   2023

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  • 自動車用タイヤの摩耗管理と摩擦帯電センサー技術

    谷 弘詞

    月刊トライボロジー   36 (10), 30-33   2022.10

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  • 高架橋の健全性診断のための自立型振動センサの研究

    石井智丈, 池田幸穂, 小金沢新治, 谷弘詞, 多川則男, 呂仁国

    インフラメンテナンス国民会議   2021.7

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  • トライボトロニクス

    小金沢新治, 谷弘詞, 呂仁国, 多川則男

    技苑   ( 150 )   2020

  • 蜂を模倣した小型飛翔機構

    小金沢 新治, 張場 義仁, 谷 弘詞, 呂 仁国, 多川 則男

    関西大学先端科学技術シンポジウム講演集   21   59 - 61   2017.1

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    Language:Japanese   Publisher:関西大学先端科学技術推進機構  

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  • A-3-2 Structural Change of DLC Film Heated by Laser Irradiation, Analyzed using Surface Enhanced Raman Spectroscopy

    HORI Yasuhiro, TANI Hiroshi, KOGANEZAWA Shinji, LU Renguo, TAGAWA Norio

    Conference on Information, Intelligence and Precision Equipment : IIP   2016   "A - 3-2-1"-"A-3-2-4"   2016.3

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    Language:Japanese   Publisher:The Japan Society of Mechanical Engineers  

    Heat assisted magnetic recording (HAMR) is suggested as a technique to realize next-generation high-density magnetic recording. The heat resistance of lubrication film and the diamond like carbon (DLC) film of the magnetic disk surface for the laser irradiation is important factor to realize the HAMR. In this study, we focus on the structural change of DLC film on disk surface by laser heating. Then, we observed the Raman spectra using the surface enhanced Raman spectroscopy. As the results, we confirmed that the structural change of DLC film was reduced with the disk rotational speed and it was estimated that the structural change did not occur on the actual rotation speed of HDDs.

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  • H-2-1 Study of the vibration power generator using a triboelectric charging

    TSUJIOKA Koji, TANI Hiroshi, KOGANEZAWA Shinji, LU Lenguo, TAGAWA Norio

    Conference on Information, Intelligence and Precision Equipment : IIP   2016   "H - 2-1-1"-"H-2-1-2"   2016.3

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    Language:Japanese   Publisher:The Japan Society of Mechanical Engineers  

    Vibration electric power generator has been attracting attention as an energy harvesting technology. Energy harvesting technology is an effective approach for sustainable, maintenance-free, and green power source for wireless, portable, or implanted electronics. Power generation using triboelectric charging is similar to that using electret. However it is flexible and very low cost. This study, we focus on a simple and high power vibration generator used by triboelectric charging for wearable power generator.

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  • H-3-1 Study of tribological properties of carbon nanofiber formed by SiC surface decomposition method

    Yamashita Masahiro, Tani Hiroshi, Koganezawa Shinji, Lu Lenguo, Tagawa Norio

    Conference on Information, Intelligence and Precision Equipment : IIP   2016   "H - 3-1-1"-"H-3-1-2"   2016.3

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    Language:Japanese   Publisher:The Japan Society of Mechanical Engineers  

    Silicon carbide (SiC) is well known as a ceramic material which have superior friction and wear resistance characteristic in the water. That is used as a material for sliding bearings and mechanical seals. However, it have a problem that friction and wear become large in the ultra-pure water and during slow rotation. Then, we studied to improve the tribological properties of the carbon nanofiber (CNF) on the surface of sintered SiC grown by the SiC surface decomposition method. As a result, the friction force was reduced by the CNF on SiC surface.

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  • B-1-3 Reduction of flow-induced excitation force on head actuator in hard disk drives

    NAKAMURA Shuta, KOGANEZAWA Shinji, LU Renguo, TANI Hiroshi, TAGAWA Norio

    Conference on Information, Intelligence and Precision Equipment : IIP   2016   "B - 1-3-1"-"B-1-2-3"   2016.3

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    Currently, hard disk drives (HDDs) are widely used as an auxiliary storage device. HDDs are still in great demand owing to their large capacity and low price. To achieve more recording capacity in HDDs, a more precise positioning accuracy of the magnetic heads is necessary. However, rotation of the disks causes an air-flow between the disks, and the head positioning accuracy deteriorates due to the air-flow-induced carriage vibration. In previous studies, experimental results confirmed that positioning error was improved by attaching linear protrusions on the leading edge of the carriage arms. However, the mechanism of this phenomenon has not yet been elucidated. In the current research, we evaluated the effect of leading-edge protrusions on the flow-induced carriage vibration by finite element method (FEM) analysis.

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  • H-2-2 Control of Drag Friction on Pipe Wall by Permanent Magnet

    TANI Hiroshi, KOGANEZAWA Shinji, MATSUI Takuzo, TAGAWA Norio

    Conference on Information, Intelligence and Precision Equipment : IIP   2016   "H - 2-2-1"-"H-2-2-2"   2016.3

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    In our previous study, we confirmed the magnetic field of permanent magnet on the steel pipe could reduce the drag friction on the laminar flow of air in the pipe. Then, we focused that the magnetic field distribution affected the drag friction on the pipe wall. We prepared the ring type and cuboid type of magnets and compared the drag friction. As the results, the ring type magnets increased the drag friction, however, the cuboid type magnets reduce that. The estimated forces derived from the calculation of magnetic field distribution could explain the phenomena. We concluded that the magnetic field could control the drag friction of air flow in pipe flow.

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  • A-1-2 Observation of Thermal Decomposition Behavior of PFPE Lubricant Film on Magnetic Head Sliders

    ASADA Hiroaki, TANI Hiroshi, KOGANEZAWA Shinji, LU Renguo, TAGAWA Norio

    Conference on Information, Intelligence and Precision Equipment : IIP   2016   "A - 1-2-1"-"A-1-2-2"   2016.3

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    We successfully demonstrated the availability of TOF-SIMS (Time of flight-secondary ion mass spectroscopy) in studying the thermal decomposition of the lubricant film on magnetic head slider under heating in the vacuum chamber of TOF-SIMS. By comparing the positive mass spectrum of wide range, we found that the molecular weight distribution of lubricant changed by heating and we confirmed that the thermal decomposition of the lubricant could be accelerated by the catalysis of Al_2O_3.

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  • Progress and Prospect of Tribology in Magnetic Recording Disk Storage

    61 ( 10 )   659 - 664   2016

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  • S1620201 Development of separated pivot-shaft actuator with small skew-angle in hard disk drives

    Koganezawa Shinji, Meng Ying, Hariba Yoshihito, Tani Hiroshi, Tagawa Norio

    Mechanical Engineering Congress, Japan   2015   "S1620201 - 1"-"S1620201-5"   2015.9

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    In hard disk drives (HDDs), rotary-type voice coil motors (VCMs) are exclusively used for positioning head transducers on a target track. The rotary VCMs essentially have a skew angle, and its variation reaches more than 30° in the typical 3.5-in. HDDs. It is generally known that such a large skew angle deteriorates the flying stability of the head sliders and off-track capability. Recently, it has been considered that the large skew angle is capable of deteriorating the quality of the read-back signal in two-dimensional magnetic recording. The reduction in the skew angle, therefore, is strongly desired in HDDs. We previously proposed a new actuator structure, a separated pivot-shaft actuator (SPA), for reducing the skew angle, and its satisfactory capability for seeking and tracking actuations was demonstrated using finite element method analysis. In this study, we assembled a prototype SPA, measured the frequency response functions to reveal the actual mechanical characteristics.

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  • S1620101 Heat Resistance Improvement of PFPE Lubricant Film by Ultra Violet Irradiation with Bias Voltage

    TANI Hiroshi, SAKANE Yasuo, KOGANEZAWA Shinji, TAGAWA Norio

    Mechanical Engineering Congress, Japan   2015   "S1620101 - 1"-"S1620101-4"   2015.9

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    UV irradiation with the bias voltage between the magnetic disk and the counter electrode above disk surface increases the bonded ratio of the perfluoropolyether (PFPE) lubricant film on disk surface. In this study, two types of lubricant materials (Fomblin Z-tetraol and Moresco ADOH) were prepared and were coated on disk surface. After coating of lubricant film, the UV irradiation treatment with the bias voltage to lubricated disk surface was performed and the depletion of these lubricant films was compared by the pin-on-disk test with the laser heating mechanism. As the results, the lubricant film treated by UV irradiation without the bias voltage showed deeper lubricant depletion than that with the bias voltage, and the ADOH showed shallower lubricant depletion than Z-tetraol. On the other hand, the molecular weight distributions of ADOH film on disk surface treated by UV irradiation with and without the bias voltage were compared using the time of flight secondary ion mass spectroscopy (TOF-SIMS), and the bias voltage was estimated to increase the dissociation of hydroxyl end-groups and the chemical adsorption to disk surface.

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  • WeA-4-3 REDUCTION OF LUBRICANT PICKUP BY BIAS VOLTAGE BETWEEN SLIDER AND DISK SURFACES

    Tani Hiroshi, Koganezawa Shinji, Tagawa Norio

    Proceedings of ... JSME-IIP/ASME-ISPS Joint Conference on Micromechatronics for Information and Precision Equipment : IIP/ISPS joint MIPE   2015   "WeA - 4-3-1"-"WeA-4-3-3"   2015.6

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    We studied the effect of bias voltage between the slider and disk surfaces to reduce lubricant pickup by the slider. A perfluoropolyether (PFPE) lubricant film, which is coated on the disk surface, has been considered to be charged to a negative voltage by the air flow on the rotational disk surface. Because the PFPE lubricant film is negatively charged, the lubricant pickup should be reduced by a bias voltage with a negative voltage on the slider surface. We confirmed the lubricant pickup using a lubricant pickup test under different bias voltages. As a result, the positive voltage of the slider accelerated the lubricant pickup, and the negative voltage reduced it.

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  • MNM-1B-3 Instability of Head-Disk Interface on Light Contact Recording

    Tani Hiroshi, Yamaguchi Tom, Tagawa Norio

    2010 ( 2 )   33 - 34   2010.10

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    The instability of the slider touchdown process was observed by the sensitive method that uses PZT sensor mounted on a suspension. By using this method, we could differentiate between the contact between the slider and the lubricant surface, the stable regime beyond touchdown (surfing regime), and the contact between the slider and the bonded lubricant / the carbon surface. Z-dol2000S clearly showed the surfing regime, and the touchdown power depended on the lubricant thickness. PZT output signal at touchdown increased with the lubricant thickness.

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  • MNM-1B-2 Depletion characteristics of monolayer thickness liquid lubricant films induced by high frequency pulsed-laser heating

    TAGAWA Norio, MIKI Takao, TANI Hiroshi

    2010 ( 2 )   31 - 32   2010.10

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    Fundamental research on lubricant depletion due to 300-kHz rapid pulsed-laser heating was conducted, when the lubricant film thickness is less than one monolayer. The conventional lubricant Zdol2000 was used. As a result, it was found that the lubricant depletion mechanism involves the desorption or decomposition of the lubricant molecules. The lubricant depletion characteristics when the thickness of the lubricant film is less than that of a monolayer film can be explained by using the experimental results obtained from the temperature programmed desorption spectroscopy (TPD) for tested lubricant film.

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  • A-10 Interactions between probes and ultra-thin lubricant films using atomic force microscope

    FUKUNAGA Ryuji, TAGAWA Norio, TANI Hiroshi

    Conference on Information, Intelligence and Precision Equipment : IIP   2010   37 - 39   2010.3

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    Recently, it is important to clarify the interactive forces between slider and disk surfaces in nanometer head-disk interface region in HDD, in order to achieve ultra-high magnetic recording density. This paper describes the interactions between atomic force microscope (AFM) probes and ultra-thin liquid lubricant films. We investigated the difference in a response of the force curve and lateral force by varying the lubricant materials (Z-tetraol, TA-30, D-4OH) and lubricant film thickness. From the experimental results, it was found that meniscus bridge is easy to be extended at high lubricant film thickness. On the other hand, adhesive force and lateral force gradually decreased with an increase in the lubricant thickness. The interactive forces around monomolecular film thickness are affected the adsorption form the lubricant molecules.

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  • 616 Study on active aberration free micro actuator mechanisms for multilayer optical disks

    FUJIWARA Hitoshi, TAGAWA Norio, TANI Hiroshi

    2010 ( 85 )   "6 - 16"   2010.3

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  • 606 Study of slider hysteresis behavior with dynamic flying height control

    MAENO Satoshi, TAGAWA Norio, TANI Hiroshi

    2010 ( 85 )   "6 - 6"   2010.3

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  • 412 Tribological characteristics of DLC film on periodic nano-structure : Effect of periodic nano-structure on dry friction

    MUNEZAWA Kenichi, TAGAWA Norio, TANI Hiroshi

    2010 ( 85 )   "4 - 16"   2010.3

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  • 413 Tribological characteristics of Vertically Aligned Carbon Nanotube Film with PFPE lubricant magnetic disks

    MORI Masutaro, TANI Hiroshi, TAGAWA Norio, KUSUNOKI Michiko

    2010 ( 85 )   "4 - 17"   2010.3

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  • A-4 Study of Vapor Lubrication supplied to head disk interface

    Okano Takahiko, TAGAWA Norio, TANI Hiroshi

    Conference on Information, Intelligence and Precision Equipment : IIP   2010   17 - 18   2010.3

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    Head disk interface (HDI)system assisted by vapor Perfluoropolyether (PFPE)lubrication was discussed in this paper. PFPE on magnetic disks are widely used as the lubricants for hard disk drives to prevent from the wear at the head disk interface (HDI). The thickness of lubricant changes due to the spin-off and wear by the contact between head and disk. In this study, we confirmed that vapor lubrication replenishes the depletion of lubricant film and the adsorbed lubricant thickness saturated with disk rotation time.

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  • A-6 Visualization of lubricant pick-up phenomena by lubricant thickness mapping on slider surface

    TANI Hiroshi, KUBOTA Masami, TSUGIGUTI Yusuke, TAGAWA Norio

    Conference on Information, Intelligence and Precision Equipment : IIP   2010   24 - 25   2010.3

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    Recently, head-disk-interface (HDI) spacing in hard disk drives (HDDs) has been decreased under a few nanometers by the dynamic flying control (DFH) technology in order to achieve an ultra-high density magnetic recording. However, lubricant pick-up by head slider increases on the HDI with ultra-low flying height. In order to reduce the lubricant pick-up, the pick-up phenomena should be visualized by sensitive method, and that phenomena should be understand at the point of the pick-up mechanism. Therefore, we developed the slider surface analyzing (SSA) tester to observe the lubricant thickness distribution on the slider surface at unloading point. As the results, the lubricant is picked up by the DFH protrusion on trailing pad, when the back-off power is less than approximately 2 nm. On the other hand, the dewetting phenomena were observed on slider surface. The dewetting phenomena occurs the increase of the flying height at head loading after long soak at unloading position.

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  • A-12 Experimental study of Head Disk Interface instability for light contact recording

    YAMAGUCHI Tomu, TANI Hiroshi, TAGAWA Norio

    Conference on Information, Intelligence and Precision Equipment : IIP   2010   42 - 43   2010.3

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    To further increase recording density of hard disk drives (HDDs), it is necessary to reduce the flying height of magnetic head. Recently, the flying height of magnetic head is under 2nm by using Dynamic Flying Height (DFH) control. To more reduce the flying height, we studied the light contact recording which means that DFH protrusion is sliding on the lubricant film surface. We analyzed the DFH slider dynamics by acoustic emission (AE) from the Pzt element attached on the head suspension. As a result the different vibration modes were measured the contact of sliders with lubricant surface and carbon surface. In additions, it was found that the magnitude of the slider vibration at continuous contact with between the lubricant film depends on the lubricant material. In other words, Z-dol2000S showed lower vibration than Z-tetraol2000S.

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  • A-16 Study of Head-Disk Interface for Laser-Assisted Magnetic Recording : Experimental identification of local temperature increase on disk surface due to laser heating

    UEDA Kenji, TAGAWA Norio, TANI Hiroshi

    Conference on Information, Intelligence and Precision Equipment : IIP   58 - 60   2010

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    Laser-assisted magnetic recording is one of the novel technology for achieving a magnetic recording density of more than 1 Tb/in^2. In this technology, it is suggested that there is serious issues for the ultra-thin liquid lubricant films on the disk surfaces. This is because these films are heated to high temperature using laser beams. In this study, we focused on the local temperature on disk surface due to laser heating in laser-assisted magnetic recording. The local temperature increase was identified using the change of refractive index and absorption coefficient of the DLC film experimentally. In addition, the estimated temperature was compared with the computer simulation results and good agreement was obtained.

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  • 921 Study of Head-Disk Interface for Laser-Assisted Magnetic Recording : Effect of Lubricant Film Materials

    KAKITANI Ryo, TAGAWA Norio, TANI Hiroshi

    2009 ( 84 )   "9 - 21"   2009.3

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  • 923 Influence of ultra-thin liquid lubricant films on touch-down and take-off hysteresis behavior of flying sliders

    TABATA Takahiro, TAGAWA Norio, TANI Hiroshi

    2009 ( 84 )   "9 - 23"   2009.3

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  • 925 Study on nano-spreading characteristics of ultra-thin liquid lubricant films

    TANIIKE Yoshihiro, TAGAWA Norio, TANI Hiroshi

    2009 ( 84 )   "9 - 25"   2009.3

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  • 919 Study on hysteresis behavior of chemically modified slider

    KITAGUCHI Masahiro, TAGAWA Norio, TANI Hiroshi

    2009 ( 84 )   "9 - 19"   2009.3

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  • 922 Study of head-disk interface for discrete track magnetic recording

    OBAYASHI Takumi, TAGAWA Norio, TANI Hiroshi

    2009 ( 84 )   "9 - 22"   2009.3

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  • 920 Study of Head-Disk Interface for Laser-Assisted Magnetic Recording : Effect of Lubricant thickness and Bonded Ratio

    ANDO Hideki, TAGAWA Norio, TANI Hiroshi

    2009 ( 84 )   "9 - 20"   2009.3

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  • 924 Interactions between probes and ultra-thin lubricant films using environmentally controlled atomic force microscope

    ADACHI Yuki, TAGAWA Norio, TANI Hiroshi

    2009 ( 84 )   "9 - 24"   2009.3

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  • 926 Development of active slider mechanisms using composite multilayer PZT thin film based on MEMS technology

    ITOH Daisuke, TAGAWA Norio, TANI Hiroshi

    2009 ( 84 )   "9 - 26"   2009.3

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  • ガスクラスターイオンビーム照射による平坦化の表面形状依存性

    廣田智一, 豊田紀章, 山田公, 長藤圭介, 濱口哲也, 谷弘詞

    応用物理学会学術講演会講演予稿集   69th ( 2 )   2008

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Presentations

  • 極圧性を持つ硫黄複素環式化合物の潤滑性能

    山下 瑛都, 呂 仁国, 谷 弘詞, 小金沢 新治, 川田 将平

    日本機械学会 関西支部2023年度関西学生会卒業研究発表講演会, 第99期定時総会講演会  2024.3 

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    Event date: 2024.3

    Venue:大阪工業大学   Country:Japan  

    17AM1-2

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  • タイヤ組込み圧電フィルムによる車両荷重推定

    伊崎 吉紀, 谷 弘詞, 小金沢 新治, 呂 仁国, 川田 将平, 嶋内 友哉

    日本機械学会 関西支部2023年度関西学生会卒業研究発表講演会, 第99期定時総会講演会  2024.3 

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    Event date: 2024.3

    Venue:大阪工業大学   Country:Japan  

    17PM1-1

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  • レッドロビンの葉の表面構造とトライボロジー特性

    前山 恵美, 呂 仁国, 谷 弘詞, 小金沢 新治

    日本機械学会 関西支部2023年度関西学生会卒業研究発表講演会, 第99期定時総会講演会  2024.3 

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    Event date: 2024.3

    Venue:大阪工業大学   Country:Japan  

    15AM2-1

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  • PFPE 潤滑膜の摩擦摩耗特性に関する研究

    田中 佑弥, 谷 弘詞

    日本機械学会 関西支部2023年度関西学生会卒業研究発表講演会, 第99期定時総会講演会  2024.3 

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    Event date: 2024.3

    Venue:大阪工業大学   Country:Japan  

    16PM2-4

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  • 磁気ディスク装置の大容量化のための薄型かしめの設計

    濵 志昂, 小金沢 新治, 谷 弘詞, 呂 仁国, 川田 将平

    日本機械学会 関西支部2023年度関西学生会卒業研究発表講演会, 第99期定時総会講演会  2024.3 

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    Event date: 2024.3

    Venue:大阪工業大学   Country:Japan  

    18AM1-5

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  • 超磁歪型振動発電器の高出力化の検討

    荒木 貴弥, 小金沢 新治, 谷 弘詞, 呂 仁国, 川田 将平

    日本機械学会 関西支部2023年度関西学生会卒業研究発表講演会, 第99期定時総会講演会  2024.3 

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    Event date: 2024.3

    Venue:大阪工業大学   Country:Japan  

    18PM1-4

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  • グラフェン保護膜のHDIトライボロジー特性に関する研究

    森山 大吾, 谷 弘詞, 小金沢 新治, 呂 仁国, 川田 将平

    日本機械学会 関西支部2023年度関西学生会卒業研究発表講演会, 第99期定時総会講演会  2024.3 

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    Event date: 2024.3

    Venue:大阪工業大学   Country:Japan  

    17PM1-2

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  • マイクロカレント発生機能組込みインソールの開発

    山形 祥一朗, 谷 弘詞, 信岡 裕哉, 呂 仁国, 小金沢 新治, 川田 将平

    日本機械学会 関西支部2023年度関西学生会卒業研究発表講演会, 第99期定時総会講演会  2024.3 

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    Event date: 2024.3

    Venue:大阪工業大学   Country:Japan  

    15AM2-2

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  • 橋梁の振動波形の分析による大型車両の通行台数の計数に関する研究

    水谷 充志, 小金沢 新治, 谷 弘詞, 呂 仁国, 川田 将平

    日本機械学会 関西支部2023年度関西学生会卒業研究発表講演会, 第99期定時総会講演会  2024.3 

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    Event date: 2024.3

    Venue:大阪工業大学   Country:Japan  

    18PM1-5

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  • 脱可能なタイヤ組み込み用摩擦発電機の開発

    谷 弘詞, 杉本 睦樹, 藤原 崇博, 川田 将平, 呂 仁国, 小金沢 新冶

    日本機械学会情報・知能・精密機器部門講演会 IIP2024  2024.3 

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    Event date: 2024.3

    Venue:岡山   Country:Japan  

    IIPH-2-3

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  • 凹凸球面接触を利用した磁歪型振動センサの曲げ応力の低減

    畑中 雅也, 小金沢 新治, 谷 弘詞, 呂 仁国, 川田 将平

    日本機械学会情報・知能・精密機器部門講演会 IIP2024  2024.3 

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    Event date: 2024.3

    Venue:岡山   Country:Japan  

    IIPH-2-4

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  • 適応制御によるHDDの高周波数外乱の低減に関する研究

    船井 健生, 小金沢 新治, 谷 弘詞, 呂 仁国, 川田 将平

    日本機械学会情報・知能・精密機器部門講演会 IIP2024  2024.3 

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    Event date: 2024.3

    Venue:岡山   Country:Japan  

    IIPB-2-3

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  • 摩擦発電とそのIoT応用, MEMS デバイスの最新研究と応用技術講演会 第2回「エナジーハーベスタとそのIoT応用技術」

    谷 弘詞

    日本機械学会情報・知能・精密機器部門講演会 IIP2024  2024.3 

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    Event date: 2024.3

    Venue:岡山   Country:Japan  

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  • 振動駆動による斜板脚アクチュエータの研究

    坪井 穂宮, 小金沢 新治, 谷 弘詞, 呂 仁国, 川田 将平

    日本機械学会情報・知能・精密機器部門講演会 IIP2024  2024.3 

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    Event date: 2024.3

    Venue:岡山   Country:Japan  

    IIPK-2-1

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  • 熱アシスト磁気記録におけるAC電場を用いたヘッドスメア低減に関する研究

    幸 優人, 谷 弘詞, 川田 将平, 呂 仁国, 小金沢 新治

    日本機械学会情報・知能・精密機器部門講演会 IIP2024  2024.3 

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    Event date: 2024.3

    Venue:岡山   Country:Japan  

    IIPA-1-5

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  • タイヤ内面の圧電フィルムによるタイヤ荷重の推定

    嶋内 友哉, 谷 弘詞, 小金沢 新治, 呂 仁国, 川田 将平

    日本機械学会情報・知能・精密機器部門講演会 IIP2024  2024.3 

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    Event date: 2024.3

    Venue:岡山   Country:Japan  

    IPH-3-1

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  • 高温加熱された摩擦場におけるDC電場の影響

    泉谷 裕毅, 谷 弘詞, 小金沢 新治, 呂 仁国, 川田 将平

    日本機械学会情報・知能・精密機器部門講演会 IIP2024  2024.3 

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    Event date: 2024.3

    Venue:岡山   Country:Japan  

    IIPA-1-3

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  • テクスチャリングした表面におけるトライボフィルムの解析

    李 茜茹, 呂 仁国, 谷 弘詞, 川田 将平, 小金沢 新治

    日本機械学会情報・知能・精密機器部門講演会 IIP2024  2024.3 

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    Event date: 2024.3

    Venue:岡山   Country:Japan  

    IIPA-1-2

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  • AE 法によるスラスト軸受運転状態のセンシング

    宮本 佳祐, 呂 仁国, 谷 弘詞, 川田 将平, 小金沢 新治

    日本機械学会情報・知能・精密機器部門講演会 IIP2024  2024.3 

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    Event date: 2024.3

    Venue:岡山   Country:Japan  

    IIPJ-2-2

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  • 摩擦発電機で動作するエアタグ組み込みシューズの開発

    信岡 祐哉, 谷 弘詞, 小金沢 新治, 呂 仁国, 川田 将平

    日本機械学会情報・知能・精密機器部門講演会 IIP2024  2024.3 

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    Event date: 2024.3

    IIPH-2-1

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  • グリース劣化モニタリングセンサ組み込み転がり軸受の開発

    戸根 勇也, 谷 弘詞, 小金沢 新治, 呂 仁国, 川田 将平

    日本機械学会情報・知能・精密機器部門講演会 IIP2024  2024.3 

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    Event date: 2024.3

    Venue:岡山   Country:Japan  

    IIPH-2-2

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  • Improvement in Power Generation Capability of a Self-Powered Vibration Sensor for Bridge Structural Health Monitoring System International conference

    Masaya Hatanaka, Shinji. Koganezawa, Hiroshi. Tani, Renguo. Lu, Shouhei. Kawada

    The 22nd International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications (Power MEMS 2023)  2023.12 

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    Event date: 2023.12

    Language:English  

    Venue:Abu Dhabi  

    DOI: 10.1109/PowerMEMS59329.2023.10417614.

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  • Ionic liquid and pvdf composite films for triboelectric nanogenerator International conference

    Hiroshi Tani, Yangwei Zhu, Shouhei Kawada, Renguo Lu, Shinji Koganezawa

    The 22nd International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications (Power MEMS 2023)  2023.12 

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    Event date: 2023.12

    Language:English  

    Venue:Abu Dhabi  

    P2-15d

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  • LSTM-Driven Vehicle Counting for Bridge Health Monitoring with a Magnetostrictive Vibration Sensor

    Shinji Koganezawa, Futa Matsumoto, Hiroshi Tani, Renguo Lu, Shouhei Kawada

    2023 IEEE SENSORS  2023.10 

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    Event date: 2023.10 - 2023.11

    Language:English  

    Venue:Vienna   Country:Austria  

    DOI: 10.1109/SENSORS56945.2023.10325112.

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  • 摩擦帯電現象を利用したタイヤ周辺センサのバッテリーレス化技術の開発

    杉本睦樹, 黒田賢一, 藤原嵩博, 藤原謙吾, 亀川久恵, 谷弘詞

    自動車技術会2023年秋季大会  2023.10 

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    Event date: 2023.10

    Venue:名古屋   Country:Japan  

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  • Improvement of Perfluoropolyether Lubricant Adsorption on Graphene Overcoat by Ultraviolet and Heat Treatment International conference

    Hiroshi Tani, Keiji Kawata, Shohei Kawada, Renguo Lu, Shinji Koganezawa, Norio Tagawa

    9th international tribology conference Fukuoka 2023 (ITC2023)  2023.9 

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    Event date: 2023.9

    Venue:Fukuoka   Country:Japan  

    28-C-05

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  • Lubricating Mechanism of Silicone-containing Ionic Liquids as Lubricant Additives

    Makoto Morishita, Shouhei Kawada, Renguo Lu, Shinji Koganezawa, Hiroshi Tani, Gen Masuda

    9th international tribology conference Fukuoka 2023 (ITC2023),  2023.9 

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    Event date: 2023.9

    Language:English  

    Venue:Fukuoka   Country:Japan  

    26-PO-21

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  • In-situ Observation of Electric-Field-Driven Behavior of Lubricant Molecules

    Chencheng Wu, Kazufumi Kontani, Renguo Lu, Shohei Kawada, Hiroshi Tani, Shinji Koganezawa

    9th international tribology conference Fukuoka 2023 (ITC2023)  2023.9 

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    Event date: 2023.9

    Language:English  

    Venue:Fukuoka   Country:Japan  

    27-PO-13

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  • In-situ Observation of Electric-Current-Induced Decomposition of Lubricants International conference

    Kento Imai, Renguo Lu, Shohei Kawada, Hiroshi Tani, Shinji Koganezawa

    9th international tribology conference Fukuoka 2023 (ITC2023)  2023.9 

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    Event date: 2023.9

    Venue:Fukuoka   Country:Japan  

    27-PO-14

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  • 磁気ディスクPFPE潤滑剤の主鎖構造の違いによるHDIトライボロジー特性への影響

    2020.9 

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  • 潤滑油のトライボロジー特性に及ぼす電場の影響

    2020.9 

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  • investigation of smear formation mechanism from DLC film by heating

    2020.6 

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    Event date: 2020.6

    Venue:Virtual Meeting  

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  • Summary of Smear Behavior due to Laser Heating and Technical Countermeasures in HAMR

    2020.6 

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  • Effects of DLC Thin Films on the Smear Characteristics upon Laser Heating in Air and Helium in Heat-Assisted Magnetic Recording

    2020.5 

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    Venue:Montreal, Canada  

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  • Electromagnetic energy harvester for transportation infrastructure using vehicle tread force

    2020.5 

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    Venue:Montreal, Canada  

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  • タイヤ組込み摩擦帯電センサパッケージの耐久性

    2020.3 

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  • 主鎖構造の異なるPFPE潤滑剤の吸着特性

    2020.3 

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  • 摩擦帯電センサの発電出力に対するベースゴム硬度の影響

    2020.3 

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  • 摩擦帯電センサによる転がり軸受のアキシャル荷重の推定

    2020.3 

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  • 熱アシスト磁気記録におけるヘッドスメアのラマン分光分析

    2020.3 

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  • 摩擦帯電センサを用いた路面状態センシング可能性の検討

    2020.3 

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  • 熱アシスト磁気記録におけるヘッドスメアのTOF-SIMS分析

    2020.3 

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  • 摩擦発電を用いた発電床の開発

    2020.3 

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  • 摩擦発電機の出力向上

    2020.1 

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  • Energy Harvesting from Triboelectric Nanogenerator attached Inside Rolling Tire

    2019.12 

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    Event date: 2019.12

    Venue:Krakow, Poland  

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  • Tribofilm Characterization by Surface Enhanced Raman Spectroscopy

    2019.10 

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    Event date: 2019.10

    Venue:Chicago, USA  

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  • 電磁力による超薄型エネルギーハーベスタの研究

    盛井航太, 小金沢新治, 谷弘詞, 呂仁国, 多川則男, 石井智丈

    IIP2019 日本機械学会 情報・知能・精密機器部門講演会  2019.3 

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  • 複合潤滑膜の摩擦特性に関する研究

    上更家勇樹, 谷弘詞, 呂仁国, 小金沢新治, 多川則男

    IIP2019 日本機械学会 情報・知能・精密機器部門講演会  2019.3 

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  • 単方向スイッチを用いた摩擦発電機の出力電力変換効率の向上

    谷弘詞, 呂仁国, 小金沢新治, 多川則男

    IIP2019 日本機械学会 情報・知能・精密機器部門講演会  2019.3 

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  • 摩擦発電とセンサへの応用

    谷弘詞

    IIP2019 情報・知能・精密機器部門(IIP部門)講演会IoTシンポジウム  2019.3 

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    Event date: 2019.3

    Venue:川越  

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  • 空気及びヘリウム中におけるレーザ照射による磁気ディスクPFPE潤滑膜の分解挙動とスメア特性

    市川覚基, 市川覚基, 大多和晃司, 谷弘詞, 呂仁国, 小金沢新治, 多川則男

    IIP2019 日本機械学会 情報・知能・精密機器部門講演会  2019.3 

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  • 転がり軸受組込み型摩擦帯電センサの開発

    沖塩大樹, 谷弘詞, 呂仁国, 小金沢新治, 多川則男

    IIP2019 日本機械学会 情報・知能・精密機器部門講演会  2019.3 

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  • 片末端長鎖潤滑剤を含む磁気ディスク潤滑膜のトライボロジー特性

    安部和晃, 谷弘詞, 呂仁国, 小金沢新治, 多川則男

    日本機械学会 関西支部 第94期定時総会講演会  2019.3 

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  • 摩擦発電における接触帯電面形状の影響

    仇逸晨, 小金沢新治, 谷弘詞, 呂仁国, 多川則男

    日本機械学会 関西支部 第94期定時総会講演会  2019.3 

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  • 赤外分光用プラズモン結晶の開発

    木島恭平, 多川則男, 谷弘詞, 小金沢新治, 呂仁国

    日本機械学会 関西支部 第94期定時総会講演会  2019.3 

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  • 摩擦発電機の帯電フィルム界面における摩耗観察

    下向直樹, 谷弘詞, 多川則男, 小金沢新治, 呂仁国

    日本機械学会関西学生会2018年度学生員卒業研究発表講演会前刷集  2019.3 

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  • シンセティックジェットを用いた磁気ヘッドアクチュエータの流体加振力低減に関する研究

    川口裕司, 小金沢新治, 多川則男, 谷弘詞, 呂仁国

    日本機械学会関西学生会2018年度学生員卒業研究発表講演会前刷集  2019.3 

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  • 超磁歪材料を用いた発電装置の開発

    石井智丈, 小金沢新治, 多川則男, 谷弘詞, 呂仁国

    日本機械学会関西学生会2018年度学生員卒業研究発表講演会前刷集  2019.3 

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  • レーザ加熱された潤滑剤の分解挙動に関する研究

    野橋健佑, 多川則男, 谷弘詞, 小金沢新治, 呂仁国

    日本機械学会関西学生会2018年度学生員卒業研究発表講演会前刷集  2019.3 

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  • 摩擦帯電センサ出力に対する温湿度の影響

    吉岡駿, 谷弘詞, 多川則男, 小金沢新治, 呂仁国

    日本機械学会関西学生会2018年度学生員卒業研究発表講演会前刷集  2019.3 

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  • エーテル油類の摩擦特性に及ぼす添加剤の影響

    森本雅也, 呂仁国, 多川則男, 谷弘詞, 小金沢新治

    日本機械学会関西学生会2018年度学生員卒業研究発表講演会前刷集  2019.3 

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  • TOF-SIMSによる軸受鋼への水素侵入挙動の観察

    濱田昂幸, 塩出空, 呂仁国, 多川則男, 谷弘詞, 小金沢新治

    日本機械学会関西学生会2018年度学生員卒業研究発表講演会前刷集  2019.3 

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  • 赤外分光用プラズモン結晶の開発

    黒川想平, 木島恭平, 谷弘詞, 多川則男, 小金沢新治, 呂仁国

    日本機械学会関西学生会2018年度学生員卒業研究発表講演会前刷集  2019.3 

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  • PFPE Lubricant Film with High Thermal Stability Deposited by Photoelectron2968837 Assisted Chemical Vapor Deposition

    Hiroshi Tani, Lu Rengo, Shinji Koganezawa, Norio Tagawa

    2018 Asia-Pacific Magnetic Recording Conference (APMRC)  2018.11 

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    Event date: 2018.11

    Venue:Shanghai, China  

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  • LB法を用いたDLC・酸化物表面の吸着膜の膜厚測定

    谷弘詞, 呂仁国, 小金沢新治, 多川則男

    トライボロジー会議2018秋  2018.11 

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    Event date: 2018.11

    Venue:伊勢  

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  • グリースを電極間に介在させた摩擦帯電センサの出力

    沖塩大樹 (院), 谷弘詞, 呂仁国, 小金沢新治, 多川則男

    トライボロジー会議2018秋  2018.11 

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    Venue:伊勢  

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  • アルキルジフェニルエーテル(ADE)の境界潤滑特性に関する研究

    森本雅也, 呂仁国, 谷弘詞, 多川則男, 小金沢新治

    トライボロジー会議2018 秋  2018.11 

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    Venue:伊勢  

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  • DLCコーティングによる軸受鋼への水素侵入の抑制に関する研究 (第2報)-抑制効果のメカニズムの解明

    塩出空, 濱田昂幸, 呂仁国, 谷弘詞, 小金沢新治, 多川則男

    トライボロジー会議2018秋  2018.11 

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    Venue:伊勢  

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  • Organic Liquid Generated from DLC during Laser Heating

    Hiroshi Tani, Yuta Shibahara, Yuki Uesaraie, Renguo Lu, Shinji Koganezawa, Norio Tagawa

    Extended Abstract 2018TFC  2018.10 

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    Event date: 2018.10

    Venue:Chicago, USA  

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  • Friction reduction of SiC mechanical seal by carbon nanofiber film

    D. Okishio, H. Tani, R. Lu, S. Koganezawa, N. Tagawa

    Asiatrib 2018, Malaysia  2018.9 

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    Event date: 2018.9

    Venue:Malaysia  

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  • 片末端長鎖潤滑剤を含む磁気ディスク潤滑膜のトライボロジー特性

    安部 和晃, 谷 弘詞, 呂 仁国, 小金沢 新治, 多川 則男

    日本機械学会年次大会2018  2018.9 

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    Venue:大阪  

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  • 複合潤滑膜の摩擦特性に関する研究

    上更家 勇樹, 谷 弘詞, 呂 仁国, 小金沢 新治, 多川 則男

    日本機械学会年次大会2018  2018.9 

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    Venue:大阪  

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  • テクスチャ接触面を持つインソール組込みトライボチャージ発電機の開発

    谷 弘詞, 呂 仁国, 小金沢 新治, 多川 則男

    日本機械学会年次大会2018  2018.9 

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    Venue:大阪  

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  • Molecularly Structural Change of PFPE Lubricant Accumulated on Pin Surface at Laser Heating

    H.Tnani, Y.Shibahara, R.Lu, S. Koganezawa, N. Tagawa

    Intermag 2018, Singapore  2018.5 

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    Venue:Singapore  

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  • プラズモンレンズを用いた摩擦面の表面増強ラマン分析

    木島 恭平, 多川 則男, 谷 弘詞, 小金沢 新治, 呂 仁国

    トライボロジー会議2018春  2018.5 

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    Venue:東京  

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  • 摩擦帯電センサによる転がり軸受の回転速度と温度モニタ

    谷 弘詞, 沖塩 大樹, 呂 仁国, 小金沢 新治, 多川 則男

    トライボロジー会議2018春  2018.5 

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    Venue:東京  

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  • ポリエチレングリコール潤滑油中のカルシウム添加剤のトライボケミカル反応

    飯田 光, 谷 弘詞, 小金沢 新治, 呂 仁国, 多川 則男

    日本機械学会関西支部第 93 期定時総会  2018 

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    Venue:寝屋川  

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  • グラフェンを用いた超潤滑可能性についての研究

    内藤 領哉, 渡部 大煕, 谷 弘詞, 小金沢 新治, 呂 仁国, 多川 則男

    日本機械学会関西学生会2017年度学生員卒業研究発表講演会  2018 

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    Venue:寝屋川  

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  • 転がり軸受用摩擦帯電回転速度センサの開発

    谷 弘詞, 沖塩 大樹, 呂 仁国, 小金沢 新治, 多川 則男

    日本機械学会IIP部門講演会2018,埼玉  2018 

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    Venue:埼玉  

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  • 磁気ヘッドスライダ面の微小摩耗の定量化

    大多和 晃司, 安部 和晃, 谷 弘詞, 小金沢 新治, 呂 仁国, 多川 則男

    日本機械学会関西学生会2017年度学生員卒業研究発表講演会  2018 

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    Venue:寝屋川  

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  • レーザ加熱された潤滑剤の分解挙動に関する研究

    市川 寛基, 芝原 悠太, 谷 弘詞, 小金沢 新治, 呂 仁国, 多川 則男

    日本機械学会関西学生会2017年度学生員卒業研究発表講演会  2018 

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    Venue:寝屋川  

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  • SiC表面分解法により作製されたグラフェンの摩擦特性

    渡部 大煕, 谷 弘詞, 呂 仁国, 小金沢 新治, 多川 則男

    日本機械学会関西支部第 93 期定時総会  2018 

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    Venue:寝屋川  

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  • ロールプロセスにおける帯電防止に関する研究

    早川 泰正, 谷 弘詞, 呂 仁国, 小金沢 新治, 多川 則男

    日本機械学会関西支部第 93 期定時総会  2018 

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  • In situ Micro-FTIR Spectroscopic Observation on Shear-induced Molecular Orientation of Carboxylic Acids

    Renguo Lu, Shigeyuki Mori, Hiroshi Tani, Norio Tagawa, Shinji Koganezawa

    World Tribology Congress 2017  2017.9 

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    Event date: 2017.9

    Venue:Beijing,China  

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  • Taro-Leaf Inspired Patterning of Oleophobic Surfaces with High Wear Resistance

    Hiroshi Tani, Naoya Yamashita, Shinji Koganezawa, Norio Tagawa

    World Tribology Congress2017  2017.9 

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    Venue:Beijing China  

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  • Observation of Tribofilm Growth and Friction Coefficient Microscopy of Tribofilms

    Sora Shiode, Renguo Lu, Hiroshi Tani, Norio Tagawa, Shinji Koganezawa

    World Tribology Congress 2017  2017.9 

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    Event date: 2017.9

    Venue:Beijing,China  

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  • Adsorption Properties of an Ultrathin PFPE Lubricant with Ionic End-groups for DLC Surfaces

    Hiroshi Tani, Renguo Lu, Shinji Koganezawa, Norio Tagawa

    Eighth Advanced Forum on Tribology 2017  2017.9 

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    Event date: 2017.9

    Venue:Zhenjiang China  

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  • 昆虫サイズ飛翔体の自励振動を利用した羽ばたきの研究

    藤原嵩博, 川阪僚, 宇佐美太基, 小金沢新治, 谷弘詞, 呂仁国, 多川則男

    日本機械学会2017年度年次大会 講演論文集  2017.9 

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  • レーザー照射によるヘッドスメア成長におよぼす潤滑膜の影響

    上更家勇樹, 谷弘詞, 呂仁国, 小金沢新治, 多川則男

    日本機械学会2017年度年次大会 講演論文集  2017.9 

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  • EFECT OF LASER HEATING ON NANOSCALE WEAR OF DLC THIN FILMS IN AN AIR ENVIRONMENT

    Norio Tagawa, Hiroshi Tani, Shinji Koganezawa, Renguo Lu

    Proceedings of the ASME 2017 Conference on Information Storage and Processing Systems  2017.8 

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    Event date: 2017.8

    Venue:San Francisco,California,USA  

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  • SMEAR GROWTH OF SILOXANE OUTGAS AT LASER HEATING

    Hiroshi Tani, Norio Tagawa, Shinji Koganezawa, Renguo Lu

    Proceedings of the ASME 2017 Coference on Information Storong and Processing Systems  2017.8 

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    Event date: 2017.8

    Venue:San Francisco,California,USA  

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  • Adsorption Properties of an Ultrathin PFPE Lubricant with Ionic End-groups for DLC Surfaces

    Hiroshi Tani, Renguo Lu, Shinji Koganezawa, Norio Tagawa

    The 28th Magnetic Recording Conference 2017  2017.8 

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    Event date: 2017.8

    Venue:Tsukuba Japan  

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  • DLCコーティングによる軸受鋼への水素侵入の抑制に関する研究

    塩出空, 初鳥貴広, 呂仁国, 谷弘詞, 多川則男, 小金沢新治

    関西潤滑懇談会7月例会-第3回ポスター発表会  2017.7 

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    Event date: 2017.7

    Venue:神戸  

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  • A Study on Tribofilm Growth and the Friction Coefficient Microscopy

    Renguo Lu, Hiroshi Tani, Norio Tagawa, Shinji Koganezawa

    6th European COnference on TRIBology(ECOTrib2017)  2017.6 

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    Event date: 2017.6

    Venue:Ljubljana(Slovenia)  

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  • Macroscopic analysis for COC/Lub degradation mechanism in HAMR

    Norio Tagawa, Hiroshi Tani

    ASRC 2017 Summer Review Meeting (HAMR SWG)  2017.6 

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    Event date: 2017.6

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  • 境界潤滑におけるカルボン酸会合体摩擦特性の温度依存性

    塩出空, 呂仁国, 谷弘詞, 多川則男, 小金沢新治, 森誠之

    トライボロジー会議2017 春  2017.5 

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    Event date: 2017.5

    Venue:東京  

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  • カーボンナノファイバー膜を有するSiCのトライボロジー特性

    谷弘詞, 山下正博, 呂仁国, 小金沢新治, 多川則男

    トライボロジー会議2017 春  2017.5 

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    Event date: 2017.5

    Venue:東京  

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  • Drag FrictionControl in Laminar Airflow in Circular Pipe Using Permanents Magnets

    H.Tani, T.Matsui, S.Koganezawa, N.Tagawa

    IEE MGNETICS Digest Book,INTERMAG Europe 2017  2017.4 

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    Event date: 2017.4

    Venue:Dublin,Ireland  

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  • メニスカスフリー潤滑膜による磁気ヘッドのクリアランス特性向上

    谷 弘詞, 仲宗根 琢磨, 呂 仁国, 小金沢 新治, 多川 則男

    日本トライボロジー会議2017秋 高松  2017 

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    Venue:高松  

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  • TOF-SIMSを用いた超薄膜潤滑膜末端の深さ方向分析および分子量分布分析

    芝原 悠太, 谷 弘詞, 呂 仁国, 小金沢 新治, 多川 則男

    日本トライボロジー会議2017秋 高松  2017 

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    Venue:高松  

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  • 接触型トライボチャージ発電器の開発

    谷 弘詞, 呂 仁国, 小金沢 新治, 多川 則男

    日本トライボロジー会議2017秋 高松  2017 

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    Venue:高松  

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  • カーボンナノファイバーによるSiCメカニカルシールの低摩擦化

    沖塩 大樹, 谷 弘詞, 呂 仁国, 小金沢 新治, 多川 則男

    日本トライボロジー会議2017秋 高松  2017 

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    Venue:高松  

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  • Tribochemical Reaction and Tribofilm Formation on Friction-Activated Steel Surfaces

    Renguo Lu, Hiroshi Tani, Norio Tagawa, Shinji Koganezawa

    EMN Meeting on Surface and Interface  2016.9 

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    Event date: 2016.9

    Venue:Kuala Lumpur, Malaysia  

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  • トライボ反応膜のマイクロ摩擦特性

    塩出空, 呂仁国, 谷弘詞, 小金沢新治, 多川則男

    日本機械学会2016年度年次大会講演論文集  2016.9 

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  • シランカップリング末端を有する磁気ディスク潤滑膜の摩擦特性

    仲宗根琢磨, 谷弘詞, 呂仁国, 小金沢新治, 多川則男

    日本機械学会2016年度年次大会講演論文集  2016.9 

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  • 高周波数領域における粘弾性の直接測定法に関する研究

    小金沢新治, 勝田佑太, 谷弘詞, 呂仁国, 多川則男

    日本機械学会2016年度年次大会講演論文集  2016.9 

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  • イオン結合末端を有する極薄膜PFPE潤滑剤のDLC表面への吸着特性

    谷弘詞, 呂仁国, 小金沢新治, 多川則男

    日本機械学会2016年度年次大会講演論文集  2016.9 

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  • 銀薄膜を成膜したレンズを用いた表面増強ラマン分光分析方法の開発

    笹野大和, 谷弘詞, 呂仁国, 小金沢新治, 多川則男

    日本機械学会2016年度年次大会講演論文集  2016.9 

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  • Low Friction Properties of Associated Carboxylic Acids Induced by Molecular Orientation

    Renguo Lu, Shigeyuki Mori, Hiroshi Tani, Norio Tagawa, Shinji Koganezawa

    43rd Leeds-Lyon Symposium on Tribology  2016.9 

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    Event date: 2016.9

    Venue:Leeds, UK  

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  • 境界潤滑効果に及ぼすオレイン酸と基油との相互作用の影響

    塩出空, 近井奎介, 呂仁国, 谷弘詞, 小金沢新治, 多川則男

    関西潤滑懇談会 7月例会  2016.7 

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  • Decomposition of perfluoropolyether lubricant picked up on actual air bearing surface in heat-assisted magnetic recording

    Norio Tagawa, Hiroshi Tani, Hiroaki Asada, Renguo Lu, Shinji Koganezawa

    2016 Digest APMRC  2016.7 

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    Event date: 2016.7

    Venue:Korea  

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  • Ultrathin PFPE/DLC Hybrid Overcoat for Magnetic Disks by Photoelectron-assisted Chemical Vapor Deposition

    Hiroshi Tani, Lu Renguo, Shinji Koganezawa, Norio Tagawa

    2016 Digest APMRC  2016.7 

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    Event date: 2016.7

    Venue:Korea  

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  • Experimental study on degradation mechanisms and governing parameters of the life for COC/Lub due to laser heating in HAMR

    Norio Tagawa, Hiroshi Tani

    ASRC2016 Summer Review Meeting  2016.6 

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    Event date: 2016.6

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  • Study on the direct measurement of viscoelastic characteristics in the high-frequency range

    Shinji Koganezawa, Yuta Katsuta, Hiroshi Tani, Norio Tagawa

    Proceedings of the 16th international conference of the European society for precision engineering and nanotechnology  2016.5 

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    Event date: 2016.5 - 2016.6

    Venue:Nottingham, UK  

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  • 境界潤滑条件におけるカルボン酸会合体の摩擦特性

    呂仁国, 谷弘詞, 多川則男, 小金沢新治, 森誠之

    トライボロジー会議2016春  2016.5 

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    Event date: 2016.5

    Venue:東京  

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  • 光電子アシストCVD法による超薄膜DLC/PFPE複合膜

    谷弘詞, 呂仁国, 小金沢新治, 多川則男

    トライボロジー会議2016春  2016.5 

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    Event date: 2016.5

    Venue:東京  

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  • Effect of Molecular Orientation on Friction Properties of Associated Carboxylic Acids

    Sora Shiode, Renguo Lu, Shigeyuki Mori, Hiroshi Tani, Norio Tagawa, Shinji Koganezawa

    The 7th Advanced Forum on Tribology  2016.4 

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    Event date: 2016.4

    Venue:Nara, Japan  

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  • 摩擦帯電を利用した振動発電に関する研究

    辻岡鴻志, 谷弘詞, 小金沢新治, 呂仁国, 多川則男

    日本機械学会情報・知能・精密機器部門  2016.3 

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  • 永久磁石によるパイプ壁面摩擦のコントロール

    谷弘詞, 小金沢新治, 松井拓道, 多川則男

    日本機械学会情報・知能・精密機器部門  2016.3 

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  • 磁気ヘッドスライダ上でのPFPE潤滑剤の熱分解挙動の観察

    朝田浩明, 谷弘詞, 小金沢新治, 呂仁国, 多川則男

    日本機械学会情報・知能・精密機器部門  2016.3 

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  • 磁気ヘッドアクチュエータの流体加振力低減に関する研究

    中村周太, 谷弘詞, 小金沢新治, 呂仁国, 多川則男

    日本機械学会情報・知能・精密機器部門  2016.3 

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  • 表面増強ラマン測定によるレーザー加熱されたDLC膜の膜質変化

    堀泰裕, 谷弘詞, 小金沢新治, 呂仁国, 多川則男

    日本機械学会情報・知能・精密機器部門  2016.3 

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  • 粘弾性を正確に測定する装置の開発

    勝田佑太, 小金沢新治, 多川則男, 谷弘詞, 呂仁国

    日本機械学会,関西学生会学生員研究発表講演会講演前刷集  2016.3 

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  • 低浮上ヘッドディスクインターフェース用PFPE潤滑剤の検討

    渡部大熙, 谷弘詞, 呂仁国, 小金沢新治, 多川則男

    日本機械学会,関西学生会学生員研究発表講演会講演前刷集  2016.3 

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  • 電磁力による超薄型エネルギーハーベスタの研究

    津田翔太朗, 小金沢新治, 谷弘詞, 呂仁国, 多川則男

    日本機械学会,関西学生会学生員研究発表講演会講演前刷集  2016.3 

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  • ラマン分光分析用プラズモンレンズの開発

    芝原悠太, 谷弘詞, 多川則男, 小金沢新治, 呂仁国

    日本機械学会,関西学生会学生員研究発表講演会講演前刷集  2016.3 

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  • タッチパネルの防汚コーティング膜の耐摩耗性の検討

    早川泰正, 谷弘詞, 多川則男, 小金沢新治, 呂仁国

    日本機械学会,関西学生会学生員研究発表講演会講演前刷集  2016.3 

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  • ポリエチレングリコール潤滑油の耐摩耗性向上

    飯田光, 谷弘詞, 多川則男, 小金沢新治, 呂仁国

    日本機械学会,関西学生会学生員研究発表講演会講演前刷集  2016.3 

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  • Diamagnetic Oil Seal for Pivot Bearing of Hard Disk Drives.

    H. Tani, S. Koganezawa, N. Tagawa

    Abstracts of the MMM INTERMAG 2016 JOINT CONFERENCE  2016.1 

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    Event date: 2016.1

    Venue:SanDiego, California  

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  • Experimental study on degradation mechanisms and governing parameters of the life for COC/Lub due to laser heating in HAMR

    Norio Tagawa, Hiroshi Tani

    ASRC 2015 Winter Review Meeting  2015.12 

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  • Low interaction Pseudo-contact HDI system (Experimental study)

    Hiroshi Tani, Norio Tagawa

    ASRC 2015 Winter Review Meeting  2015.12 

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  • Development of equipment for direct measurement of viscoelastic characteristics in high-frequency range

    Shinji Koganezawa, Hiroshi Tani, Norio Tagawa

    The 6 TSME ICoME,International Conference on Mechanical Engineering  2015.12 

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    Event date: 2015.12

    Venue:Regent Cha-Am Beach Resort Phetchaburi Thailand  

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  • 磁気ディスク装置におけるトライボロジー技術の進展とその将来展望

    谷弘詞, 多川則男

    第三回日本機械学会情報機器のメカニクス制御に関する研究会  2015.11 

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  • Heat Resistance Improvement of Perfluoropolyether Lubricant Film on Magnetic Disks by UV Irradiation with Bias Voltage to Disk Surface

    H. Tani, Y. Sakane, S. Koganezawa, N. Tagawa

    2015 STLE Tribology Frontiers Conference  2015.10 

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    Event date: 2015.10

    Venue:Denver,USA  

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  • Effects of Lubricant Materials on Light Contact Between Dynamic Fly-height Control Sliders and Disk Surfaces in Hard-disk Drives

    N. Tagawa, H. Tani, S. Koganezawa

    2015 STLE Tribology Frontiers Conference  2015.10 

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    Event date: 2015.10

    Venue:Denver,USA  

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  • Thermal Decomposition of Ultra-thin PFPE films Analyzed by TOF-SIMS

    Hiroaki Asada, Hiroshi Tani, Shinji Koganezawa, Norio Tagawa

    Proceedings of the International Tribology Conference 2015  2015.9 

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    Event date: 2015.9

    Venue:Tokyo Japan  

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  • Tirbochemical Decomposition of Synthetic Oils under a High Vacuum Condition: Part 1,Induction Period for the Decomposition

    Renguo Lu, Hidetaka Nanao, Koji Takiwatari, Shigeyuki Mori, Yoshinori Fukushima, Youichi Murakami, Shozo Ikejima, Tadaaki Konno

    Proceedings of the International Tribology Conference 2015  2015.9 

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    Venue:Tokyo  

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  • 磁気ディスク装置における小スキュー角ヘッドアクチュエータの開発

    小金沢新治, 孟盈, 帳場義仁, 谷弘詞, 多川則男

    日本機械学会2015年度年次大会  2015.9 

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  • バイアス電圧印加紫外線照射によるPFPE潤滑膜の耐熱性向上

    谷弘詞, 坂根康夫, 小金沢新治, 多川則男

    日本機械学会2015年度年次大会  2015.9 

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  • REDUTION OF LUBRICANT PICKUP BY BIAS VOLTAGE BETWEEN SLIDER AND DISK SURFACES

    Hiroshi Tani, Shinji Koganezawa, Norio Tagawa

    Proceedings of the 2015 JSME-IIP/ASME-ISPS Joint Conference on Micromechatronics for Information and Precision Equipment (MIPE2015)  2015.6 

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    Event date: 2015.6

    Venue:Kobe Japan  

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  • THERMAL DECOMPOSITION OF ULTRA-THIN PFPE ANALYZED BY TOF-SIMS

    Hiroaki Asada, Hiroshi Tani, Shinji Koganezawa, Norio Tagawa

    Proceedings of the 2015 JSME-IIP/ASME-ISPS Joint Conference on Micromechatronics for Information and Precision Equipment (MIPE2015)  2015.6 

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    Venue:Kobe Japan  

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  • DEVELOPMENT OF SMALL SKEW ANGLE ACTUATOR FOR TDMR

    Yoshihito Hariba, Shinji Koganezawa, Hiroshi Tani, Norio Tagawa

    Proceedings of the 2015 JSME-IIP/ASME-ISPS Joint Conference on Micromechatronics for Information and Precision Equipment (MIPE2015)  2015.6 

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    Venue:Kobe Japan  

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  • HAMRにおけるCOC/Lub劣化メカニズム究明と寿命支配因子解明

    多川則男, 谷弘詞

    SRC第39回技術報告会  2015.6 

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  • Reduction of flow-induced excitation force on head actuator in hard disk drives

    Shuta Nakamura, Shinji Koganezawa, Hiroshi Tani, Norio Tagawa

    Proceedings of the 2015 JSME-IIP/ASME-ISPS Joint Conference on Micromechatronics for Information and Precision Equipment (MIPE2015)  2015.6 

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    Event date: 2015.6

    Venue:Kobe Japan  

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  • クラッシュしたディスクからのデータ復旧方法の開発

    前防周平, 谷弘詞, 小金沢新治, 多川則男

    トライボロジー会議2015春  2015.5 

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    Event date: 2015.5

    Venue:姫路  

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  • 磁気ディスク装置におけるトライボロジー技術の進展とその将来展望

    多川則男, 谷弘詞, 小金沢新治

    トライボロジー会議2015春  2015.5 

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    Venue:姫路  

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  • PFPE薄膜潤滑膜の摩擦特性と潤滑膜分子構造との関係

    谷弘詞, 小林永芳, 清水豪, 小金沢新治, 多川則男

    トライボロジー会議2015春  2015.5 

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    Venue:姫路  

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  • ハードディスクにおけるヘッドディスクインタフェース技術の現状と課題

    多川則男, 谷弘詞, 小金沢新治

    トライボロジー会議2015春  2015.5 

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    Venue:姫路  

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  • ヘッドディスクインタフェースにおけるスライダ摩耗低減のための気相潤滑の研究

    安井雅人, 谷弘詞, 小金沢新治, 多川則男

    トライボロジー会議2015春  2015.5 

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    Event date: 2015.5

    Venue:姫路  

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  • TOF-SIMSによる超薄膜PFPEの熱分解の分析

    朝田浩明, 谷弘詞, 小金沢新治, 多川則男

    トライボロジー会議2015春  2015.5 

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    Venue:姫路  

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  • 里芋葉状の表面形状の撥水・撥油効果

    谷弘詞, 山下直也, 小金沢新治, 多川則男

    トライボロジー会議2015春  2015.5 

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    Venue:姫路  

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  • 磁気ディスク潤滑膜の摩擦特性のレーザ加熱温度依存性に関する研究

    畑雄介, 谷弘詞, 小金沢新治, 多川則男

    トライボロジー会議2015春  2015.5 

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    Venue:姫路  

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  • SiC表面分解法で作成したカーボンナノファイバーのトライボロジー特性の検討

    山下正博, 谷弘詞, 小金沢新治, 呂仁国, 多川則男

    トライボロジー会議2015春  2015.5 

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    Event date: 2015.5

    Venue:姫路  

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  • 摩擦帯電を用いた発電に関する研究

    辻岡鴻志, 三木貴弘, 谷弘詞, 小金沢新治, 多川則男

    トライボロジー会議2015春  2015.5 

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    Event date: 2015.5

    Venue:姫路  

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  • レーザ加熱によるDLC膜の膜質変化に関する研究

    堀泰裕, 谷弘詞, 小金沢新治, 多川則男

    トライボロジー会議2015春  2015.5 

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    Venue:姫路  

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  • 磁気ディスク用マルチデンテイト潤滑剤の検討

    仲宗根琢磨, 谷弘詞, 清水豪, 小金沢新治, 多川則男

    トライボロジー会議2015春  2015.5 

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    Event date: 2015.5

    Venue:姫路  

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  • 撥水・撥油表面を有する導圧軸受の軸受特性に関する研究

    青木駿介, 谷弘詞, 小金沢新治, 多川則男

    日本機械学会関西支部第90期定時総会講演会  2015.3 

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    Event date: 2015.3

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  • ラマン分光用プラズモンセンサの開発

    細川翔太, 谷弘詞, 小金沢新治, 多川則男

    日本機械学会関西支部第90期定時総会講演会  2015.3 

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  • 防汚コーティング膜の表面形状に関する研究

    山下直也, 谷弘詞, 小金沢新治, 多川則男

    日本機械学会関西支部第90期定時総会講演会  2015.3 

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  • セルフクリーニングガラスの表面粗さ付与による防汚性向上

    池田昌弘, 谷弘詞, 小金沢新治, 多川則男

    日本機械学会関西支部第90期定時総会講演会  2015.3 

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  • TDMR用小スキュー角アクチュエータの開発

    孟盈, 小金沢新治, 谷弘詞, 多川則男

    日本機械学会関西支部第90期定時総会講演会  2015.3 

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  • 摩擦帯電を利用した振動発電に関する研究

    三木貴弘, 谷弘詞, 小金沢新治, 多川則男

    日本機械学会関西支部第90期定時総会講演会  2015.3 

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  • ナノインプリントテクスチャ上のSi02保護膜/撥水膜の耐摩耗性に関する研究

    福光洋一, 谷弘詞, 小金沢新治, 多川則男

    日本機械学会関西支部第90期定時総会講演会  2015.3 

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  • 電場と潤滑剤分子との相互作用による潤滑材ピックアップ抑制に関する研究

    名田晴亮, 谷弘詞, 多川則男, 小金沢新治

    日本機械学会関西支部第90期定時総会講演会  2015.3 

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  • 磁気力を用いた空気流の管壁面摩擦低減に関する研究

    松井拓道, 谷弘詞, 小金沢新治, 多川則男

    日本機械学会関西支部第90期定時総会講演会  2015.3 

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  • HAMRにおけるCOC/Lub劣化メカニズム究明と寿命支配因子解明

    多川則男, 谷弘詞

    SRC第38回技術報告会  2014.12 

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    Event date: 2014.12

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  • 超薄膜PFPE潤滑膜の摩擦特性の温度依存性

    谷弘詞, 小金沢新治, 多川則男

    トライボロジー会議2014秋  2014.11 

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    Event date: 2014.11

    Venue:盛岡  

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  • セルフクリーニングガラスの表面粗さ付与による防汚性向上

    池田昌弘, 谷弘詞, 桒原雄一, 小金沢新治, 多川則男

    トライボロジー会議2014秋  2014.11 

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    Event date: 2014.11

    Venue:盛岡  

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  • 不活性ガス環境下におけるレーザ照射による潤滑膜の減耗特性

    多川則男, 谷弘詞, 小金沢新治

    トライボロジー会議2014秋  2014.11 

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    Event date: 2014.11

    Venue:盛岡  

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  • 防汚コーティング膜の表面形状に関する研究

    山下直也, 谷弘詞, 小金沢新治, 多川則男

    日本機械学会第6回マイクロ・ナノ工学シンポジウム  2014.10 

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    Event date: 2014.10

    Venue:松江  

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  • 磁気ヘッドアクチュエータの流体加振力低減に関する研究

    中村周太, 小金沢新治, 谷弘詞, 多川則男

    日本機械学会2014年度年次大会  2014.9 

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  • 磁気ヘッドスライダ表面のナノテクスチャによる接触振動低減

    安井雅人, 渡邊裕昭, 谷弘詞, 小金沢新治, 多川則男

    日本機械学会2014年度年次大会  2014.9 

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  • 磁気ディスク装置における間隔リングダンパによるディスクフラッタの低減に関する研究

    小金沢新治, 山本哲輝, 谷弘詞, 多川則男

    日本機械学会2014年度年次大会  2014.9 

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  • 反磁性斥力によるピボットベアリングからのアウトガス低減

    谷弘詞, 小金沢新治, 多川則男

    日本機械学会2014年度年次大会  2014.9 

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  • DEGRADATION OF LUBRICANT FILM AND CARBON OVERCOAT SUBJECTED TO LASER HAEATING IN AN INERT GAS ENVIRONMENT IN THERMALLY ASSISTED MAGNETIC RECOREING

    Norio Tagawa, Hiroshi Tani, Shinji Koganezawa

    IEEE The 25th Magnetic Recording Conference (TMRC2014)  2014.8 

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    Event date: 2014.8

    Venue:Berkeley, California  

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  • Effect of Vapor Lubrication on Head-Disk Clearance and Slider Wear in Inert Gas Environments

    Hiroshi Tani, Jun Tomita, Shinji Koganezawa, Norio Tagawa

    ASME 2014 Conference on Information Storage and Processing Systems (ISPS2014)  2014.6 

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    Event date: 2014.6

    Venue:Santa Clara, California, USA  

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  • 不活性ガス環境下におけるレーザ加熱によるDLC超薄膜の劣化特性

    多川則男, 谷弘詞, 小金沢新治

    トライボロジー会議2014春  2014.5 

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    Event date: 2014.5

    Venue:東京  

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  • External Electric Field Assisted Ultraviolet Irradiation for Bonding of Lubricant Film on Magnetic Disks

    Hiroshi Tani, Yasuo Sakane, Shinji Koganezawa, Norio Tagawa

    IEEE International Magnetics Conference (INTERMAG EUROPE 2014)  2014.5 

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    Event date: 2014.5

    Venue:Dresden, Germany  

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  • Degradation of carbon overcoat subjected to laser heating in an inert gas environment in thermally assisted magnetic recording

    Norio Tagawa, Hiroshi Tani, Shinji Koganezawa

    IEEE International Magnetics Conference (INTERMAG EUROPE 2014)  2014.5 

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    Event date: 2014.5

    Venue:Dresden, Germany  

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  • A study on disk flutter reduction using disk-spacer dampers in hard disk drives

    Shinji Koganezawa, Tetsuki Yamamoto, Takaaki Kunisawa, Meng Ying, Hiroshi Tani, Norio Tagawa

    IEEE International Magnetics Conference (INTERMAG EUROPE 2014)  2014.5 

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    Event date: 2014.5

    Venue:Dresden, Germany  

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  • 102 Lubricant pickup in head-disk interface with applied electric field

    2014.3  The Japan Society of Mechanical Engineers

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    Language:Japanese  

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  • 103 Reduction of head slider vibration by microtexture on air bearing surface of magnetic head slider

    2014.3  The Japan Society of Mechanical Engineers

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    Event date: 2014.3

    Language:Japanese  

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  • レーザ加熱型ピンオンディスク試験機における加熱温度の同定

    畑雄介, 谷弘詞, 多川則男, 小金沢新治

    日本機械学会関西学生会学生員卒業研究発表講演会  2014.3 

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    Event date: 2014.3

    Venue:大阪府立大学  

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  • 里芋の葉を模した撥水撥油表面の開発

    横路鎮磯, 谷弘詞, 小金沢新治, 多川則男

    日本機械学会関西学生会学生員卒業研究発表講演会  2014.3 

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    Event date: 2014.3

    Venue:大阪府立大学  

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  • 水没汚染した磁気ディスクからのデータ復旧方法の開発

    吉田勇志, 谷弘詞, 多川則男, 小金沢新治

    日本機械学会関西学生会学生員卒業研究発表講演会  2014.3 

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    Event date: 2014.3

    Venue:大阪府立大学  

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  • 熱アシスト記録におけるレーザ照射時の潤滑膜減少の環境依存性

    堀泰裕, 多川則男, 谷弘詞, 小金沢新治

    日本機械学会関西学生会学生員卒業研究発表講演会  2014.3 

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    Event date: 2014.3

    Venue:大阪府立大学  

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  • 摩擦帯電を用いた発電の基礎検討

    辻岡鴻志, 谷弘詞, 小金沢新治, 多川則男

    日本機械学会関西学生会学生員卒業研究発表講演会  2014.3 

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    Event date: 2014.3

    Venue:大阪府立大学  

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  • 磁気ヘッドアクチュエーターの流体加振力低減に関する研究

    中村周太, 谷弘詞, 小金沢新治, 多川則男

    日本機械学会関西学生会学生員卒業研究発表講演会  2014.3 

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    Event date: 2014.3

    Venue:大阪府立大学  

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  • 焼結カーボン上へのカーボンナノチューブ生成方法の開発

    山下正博, 谷弘詞, 多川則男, 小金沢新治

    日本機械学会関西学生会学生員卒業研究発表講演会  2014.3 

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    Event date: 2014.3

    Venue:大阪府立大学  

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  • 磁気ディスクの超薄膜PFPE潤滑膜の潤滑剤分子構造とクリアランス特性の関係

    朝田浩明, 谷弘詞, 多川則男, 小金沢新治

    日本機械学会関西学生会学生員卒業研究発表講演会  2014.3 

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    Event date: 2014.3

    Venue:大阪府立大学  

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  • 両末端・片末端水酸基を有するPFPE超薄膜複合潤滑膜のタッチダウン・スライダ摩耗特性

    廣角直彦, 谷弘詞, 小金沢新治, 多川則男

    日本機械学会情報・知能・精密機器部門講演会論文集(CD-ROM)  2014.3 

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    Event date: 2014

    Venue:東京  

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  • 両末端・片末端水酸基を有するPFPE超薄膜複合潤滑膜の摩擦・凝着力特性

    豊田将史, 谷弘詞, 小金沢新治, 多川則男

    日本機械学会情報・知能・精密機器部門講演会論文集(CD-ROM)  2014.3 

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    Event date: 2014

    Venue:東京  

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  • 磁気ヘッドスライダのタッチダウン・摩耗に対する湿度の影響

    富田淳, 谷弘詞, 小金沢新治, 多川則男

    日本機械学会情報・知能・精密機器部門講演会論文集(CD-ROM)  2014.3 

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    Event date: 2014

    Venue:東京  

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  • Friction and Wear Properties of Thin Perfluoropolyether Film with Different Chemical Structure on Glass Substrate

    H. Tani, S. Koganezawa, N. Tagawa

    Tribology Frontier Conference 2014  2014 

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    Event date: 2014

    Venue:Chicago  

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  • 磁気ディスク装置における位置決め外乱を抑制するアクチュェータ機構の研究

    佐野紘史, 小原巧, 二川翔太, 平野雄大, 小金沢新治, 谷弘詞, 多川則男

    IIP情報・知能・精密機器部門講演会講演論文集 2014  2014 

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    Event date: 2014

    Venue:東京  

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  • 熱アシスト磁気記録におけるレーザ照射による潤滑膜減耗特性

    多川則男, 谷弘詞, 小金沢新治

    第5回マイクロ・ナノ工学シンポジウム  2013.11 

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    Event date: 2013.11

    Venue:仙台  

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  • クラッシュした磁気ディスク表面の摩耗粉クリーニングによるデータ復旧の研究

    谷弘詞, 小金沢新治, 多川則男

    第5回マイクロ・ナノ工学シンポジウム  2013.11 

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    Event date: 2013.11

    Venue:仙台  

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  • Effect of lubricant materials on light contact between dynamic fly height control sliders and disk surfaces in hard disk drives

    Norio Tagawa, Hiroshi Tani, Kazumi Iwasaki

    World Tribology Congress 2013  2013.9 

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    Event date: 2013.9

    Venue:Torino, Italy  

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  • Tribological Properties of Ultrathin DLC-Coated Nanotextured Surface on a PET Film

    Hiroshi Tani, Hideyuki Takahashi, Shinji Koganezawa, Norio Tagawa

    World Tribology Congress 2013  2013.9 

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    Event date: 2013.9

    Venue:Torino, Italy  

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  • Head-Media Clearance and Slider Wear on Disks with Chemically Bonded Lubricant

    H. Tani, N. Hirosumi, S. Koganezawa, N. Tagawa

    TMRC 2013  2013.8 

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    Event date: 2013.8

    Venue:Tokyo, JAPAN  

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  • Structural stability of nanometer-thick diamond-like carbon films due to heating for thermally assisted magnetic recording

    Norio Tagawa, Hiroshi Tani

    ASME 2013 Conference on Information Storage and Processing Systems  2013.6 

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    Event date: 2013.6

    Venue:Santa Clara, USA  

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  • Application of Vertically-aligned Carbon Nano-Tube Burnishing Slider in Cleaning Process of Magnetic Disk Surface

    Hiroshi Tani, K. Konishi, W. Norimatsu, N. Tagawa

    ASME 2013 Conference on Information Storage and Processing Systems  2013.6 

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    Event date: 2013.6

    Venue:Santa Clara, USA  

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  • Stress Analysis of Head Mounting Block in Swaging Process for Hard Disk Drives

    Hiroshi Tani, Shinji Koganezawa

    Proceedings of The 5th International Conference on Manufacturing, Machine Design and Tribology  2013.5 

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    Event date: 2013.5

    Venue:Busan, Korea  

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  • 磁気ディスク上のPFPE潤滑膜の吸着形態とスライダ摩耗に関する研究

    廣角直彦, 谷弘詞, 小金沢新治, 多川則男

    トライボロジー会議2013春  2013.5 

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    Event date: 2013.5

    Venue:東京  

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  • ピンオンディスク試験による磁気ディスク上のPFPE潤滑膜の吸着形態と摩擦力に関する研究

    豊田将史, 谷弘詞, 小金沢新治, 多川則男

    トライボロジー会議2013春  2013.5 

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    Event date: 2013.5

    Venue:東京  

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  • ガラス基板上のPFPE潤滑剤のトライボロジー特性

    新名正和, 池田昌弘, 谷弘詞, 小金沢新冶, 多川則男

    日本機械学会IIP2013情報・知能・精密機器部門講演会講演論文集No.13-11  2013.3 

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    Event date: 2013.3

    Venue:東洋大学白山キャンパス  

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  • レーザ照射による磁気ディスク上潤滑膜の減少量について

    岡健吾, 谷弘詞, 小金沢新冶, 多川則男

    日本機械学会IIP2013情報・知能・精密機器部門講演会講演論文集No.13-11  2013.3 

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    Event date: 2013.3

    Venue:東洋大学白山キャンパス  

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  • 自由度接触振動計算による軽荷重接触磁気記録の安定性の検討

    岡田浩輝, 谷弘詞, 小金沢新冶, 多川則男

    日本機械学会IIP2013情報・知能・精密機器部門講演会講演論文集No.13-11  2013.3 

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    Event date: 2013.3

    Venue:東洋大学白山キャンパス  

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  • 高密度垂直配向カーボンナノチューブのバーニッシュヘッドへの応用

    村田将明, 谷弘詞, 小金沢新冶, 多川則男

    日本機械学会IIP2013情報・知能・精密機器部門講演会講演論文集No.13-11  2013.3 

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    Event date: 2013.3

    Venue:東洋大学白山キャンパス  

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  • 撥水性を高めた表面上でのエレクトロウェッティング法による液滴搬送の研究

    米谷諒, 谷弘詞

    日本機械学会関西支部第88期定時総会講演会講演論文集No.134-1  2013.3 

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    Event date: 2013.3

    Venue:大阪工業大学  

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  • レーザー加熱によるカーボン材料の構造変化に関する研究

    戒能昴行, 谷弘詞, 小金沢新冶, 多川則男

    日本機械学会関西支部第88期定時総会講演会講演論文集No.134-1  2013.3 

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    Event date: 2013.3

    Venue:大阪工業大学  

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  • 微細凸凹形状を形成したSiウエハ表面の撥水性に関する研究

    多田翔太, 谷弘詞, 小金沢新冶, 多川則男

    日本機械学会関西支部第88期定時総会講演会講演論文集No.134-1  2013.3 

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    Event date: 2013.3

    Venue:大阪工業大学  

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  • ナノインプリント法により形成したPETフィルム上のナノテクスチャの耐摩耗性に関する研究

    高橋英之, 谷弘詞, 小金沢新冶, 多川則男

    日本機械学会関西支部第88期定時総会講演会講演論文集No.134-1  2013.3 

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    Event date: 2013.3

    Venue:大阪工業大学  

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  • ナノインプリント法により形成したPETフィルム上のナノテクスチャの耐摩耗性に関する研究

    福光洋一, 高橋英之, 谷弘詞, 小金沢新治, 多川則男

    日本機械学会関西学生会学生員卒業研究発表講演会講演前刷集  2013.3 

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    Event date: 2013.3

    Venue:大阪工業大学  

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  • 水流の磁気力を用いた管壁面摩擦低減に関する研究

    三木貴弘, 谷弘詞, 小金沢新治, 多川則男

    日本機械学会関西学生会学生員卒業研究発表講演会講演前刷集  2013.3 

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    Event date: 2013.3

    Venue:大阪工業大学  

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  • 電界印加によるPFPE潤滑剤の吸着量制御に関する研究

    名田晴亮, 谷弘詞, 小金沢新治, 多川則男

    日本機械学会関西学生会学生員卒業研究発表講演会講演前刷集  2013.3 

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    Event date: 2013.3

    Venue:大阪工業大学  

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  • 永久磁石による空気流の壁面摩擦係数の低減効果

    松井拓道, 谷弘詞, 小金沢新治, 多川則男

    日本機械学会関西学生会学生員卒業研究発表講演会講演前刷集  2013.3 

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    Event date: 2013.3

    Venue:大阪工業大学  

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  • 超撥水表面を有する動圧軸受の軸受特性に関する研究

    青木駿介, 多川則男, 谷弘詞, 小金沢新治

    日本機械学会関西学生会学生員卒業研究発表講演会講演前刷集  2013.3 

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    Event date: 2013.3

    Venue:大阪工業大学  

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  • タッチパネルの防汚コーティング膜の防汚機能に関する研究

    池田昌弘, 新名正和, 谷弘詞, 小金沢新治, 多川則男

    日本機械学会関西学生会学生員卒業研究発表講演会講演前刷集  2013.3 

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    Event date: 2013.3

    Venue:大阪工業大学  

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  • 微細凸凹形状を形成したSiウエハ表面の撥水性に関する研究

    山下直也, 多田翔太, 谷弘詞, 小金沢新治, 多川則男

    日本機械学会関西学生会学生員卒業研究発表講演会講演前刷集  2013.3 

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    Event date: 2013.3

    Venue:大阪工業大学  

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  • エレクトロウェッティングによる液滴搬送技術の検討

    細川翔太, 谷弘詞

    日本機械学会関西学生会学生員卒業研究発表講演会講演前刷集  2013.3 

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    Event date: 2013.3

    Venue:大阪工業大学  

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  • 片末端/両末端水酸基を有する超薄膜境界潤滑膜の摩擦特性

    谷弘詞, 豊田将史, 小林永芳, 清水豪, 小金沢新治, 多川則男

    日本トライボロジー学会トライボロジー会議予稿集(CD-ROM)  2013.10 

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    Event date: 2013

    Venue:福岡  

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  • Relationship of Adhesion/Friction Forces and Slider Vibration in Surfing-Recording HDI System

    12th Joint MMM-Intermag Conference  2013 

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    Event date: 2013

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  • Drag Reduction of Laminar Airflow in Circular Pipe with Magnetic Field

    Hiroshi Tani, Shinji Koganezawa, Norio Tagawa

    Intermag 2013  2013 

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    Event date: 2013

    Venue:Chicago  

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  • Adhesion and Friction Behavior of Magnetic Disks with Ultrathin Perfluoropolyether Lubricant Films Having Different End-Groups Measured using Pin-on-Disk Test

    Hiroshi Tani, Toshiya Mitsutome, Norio Tagawa

    APMRC 2012  2012 

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    Event date: 2012

    Venue:Singapore  

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  • ナノインプリントした樹脂表面の表面形状と耐摩耗性の関係

    高橋英之, 谷弘詞, 小金沢新冶, 多川則男

    第4回マイクロ・ナノ工学シンポジウム  2012 

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    Event date: 2012

    Venue:北九州  

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  • Study of Gas Cluster Ion Beam Planarization for Discrete Track Magnetic Disks

    Keisuke Nagato, Hiroshi Tani, Yasuo Sakane, Noriaki Toyoda, Isao Yamada, Masayuki Nakao, Tetsuya Hamaguchi

    IEEE TRANSACTIONS ON MAGNETICS  2008.11  IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC

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    Event date: 2008.11

    Language:English  

    We studied planarization of carbon overcoat by gas cluster ion beam (GCIB) for discrete track magnetic disks. We fabricated discrete tracks with variant pitches by focused ion beam on a 30-nm-thick carbon overcoat deposited on magnetic disks, and we planarized them with an Ar GCIB using lateral sputtering effect. It was found that planarization by GCIB was more effective for lower wavelengths than for those with a few hundreds nanometers. On the discrete tracks with 100-nm pitch and 20-nm depth, the initial peaks and valleys were removed by GCIB; however, on the ones with over 200-nm pitch, the initial peaks and valleys remained though the heights were drastically decreased. These results indicate the capability of GCIB planarization as a process for the discrete track media. Furthermore, cross sections were observed by transmission electron microscopy. The GCIB with relatively low dose could also planarize the 120-nm-pitch carbon tracks without etching the magnetic layer.

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  • Direct observation of PFPE lubricants on magnetic disks

    H. Tani, K. Sakamoto, N. Tagawa

    2008 

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  • Study of Lubricant Depletion Induced by Laser Heating in Thermally Assisted Magnetic Recording Systems—Effect of Lubricant Film Materials

    N. Tagawa, R. Kakitani, H. Tani, N. Iketani, I. Nakano

    2008 

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  • Contact hysteresis behavior of textured pad slider in head-disk interface

    Hiroshi Tani, Kennosuke Goshi, Kenji Suzuki, Tetsuya Hamaguchi

    IEEE TRANSACTIONS ON MAGNETICS  2006.10  IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC

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    Event date: 2006.10

    Language:English  

    Takeoff performance of the magnetic head slider on head-disk interface is influenced by a stick-slip vibration of a slider enhanced by the friction of the head-disk contact. We studied this phenomenon using a simulation of slider vibration based on stick-slip analysis. Obvious degradation in the takeoff performance was estimated for the disks with large friction through the simulation of the contact hysteresis defined by the difference of takeoff height and touchdown height. In order to confirm that simulation result, several types of textured pad sliders by focused ion beam fabrication were evaluated by touchdown and takeoff measurement. These pad sliders were textured at a small area near the trailing edge on a trailing pad as a corresponding contact area. The texturing of a trailing pad did not disturb the flyability of slider because the textured area was very small and did not decrease the slider fly height. As a result, the contact hysteresis of textured sliders became smaller as a function of contact area and improved the takeoff performance.

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  • Study of head takeoff phenomenon influenced by stick-slip vibration of slider on head-disk interface

    H Tani, K Goshi, T Hamaguchi, K Suzuki

    JOURNAL OF APPLIED PHYSICS  2006.4  AMER INST PHYSICS

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    Event date: 2006.4

    Language:English  

    Takeoff performance of the magnetic head slider on head-disk interface is influenced by a stick-slip vibration of slider enhanced by the friction of head-disk contact. We studied this phenomenon using altitude test and a simulation of slider vibration based on stick-slip analysis. Obvious degradation in the takeoff performance was observed for the disks with small roughness. This phenomenon can be explained using a simple stick-slip model of slider vibration enhanced by friction force, and investigated through the evaluation of the pressure hysteresis defined by the difference of takeoff pressure and touchdown pressure. Hysteresis simulation based on the stick-slip model revealed that large stick-slip vibration induces hysteresis for the disk with low roughness. We confirmed by the experiment and simulation that this stick-slip vibration of slider continues in the case of large friction coefficient after one slider-disk contact. We also confirmed that, slider-disk contact in low fly height occurs due to the trigger which the slider contacts on lubricant pooling. Reduction of friction force was found to be effective to improve the pressure hysteresis and takeoff performance. (C) 2006 American Institute of Physics.

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  • Spin-off Behavior of PFPE Lubricant on Magnetic Disks

    H. Tani, H. Matsumoto

    Tribology International  2003.4 

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    Event date: 2003.4

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  • Improvement of DLC overcoat by controlling hydrogen content and its application to lower flying height hard disk medium

    T. Ono, H. Matsumoto, M. Shoda, H. Tani, T. Kozaki, Y. Kokaku

    2003 

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  • The Glide Noise Caused by Organic Hydrocarbon on DLC Overcoat of Magnetic Recording Disk

    M. Shoda, T. Kozaki, T. Ono, H. Matsumoto, H. Tani

    2003 

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  • Study on the effect of the 3d topographic characteristics to the performance of the glass hard disk

    S. Hara, K. Yanagi, H. Tani

    2003 

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    Event date: 2003

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  • Catastrophic damage of magnetic recording disk caused by slider-disk impact during loading/unloading

    Mitsuhiro Shoda, Hiroshi Tani

    IEEE Transactions on Magnetics  2003 

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    Event date: 2003

    Language:English  

    Catastrophic damage of a disk caused by impact between a slider and a disk during loading/unloading is investigated using many variations of disk samples with the different scratch resistances. At first, the accelerated loading/unloading test condition to increase disk damage was studied as the function of disk-runout during a disk rotating, rotational speed of a disk, and sweep velocity of a slider using disk samples with the same scratch resistance. Next, in accelerated test conditions, many kinds of disk samples with different scratch resistances were tested to find a relation between disk damage and scratch resistance of thin films. Flyability of a slider over a disk during a slider sweeping in these tests was monitored using an acoustic emission transducer. Disk surface and slider surface after the test was observed using an optical microscope and an optical surface analyzer. Scratch resistance of a disk was measured using a newly developed high-speed scratch tester. As a result, film-peeling damage was broken out at the loading position of a disk with increasing disk-runout. Film-peeling damage was broken out much more with decreasing scratch resistance of a disk. When scratch resistance of a disk was lower, flyability became bad suddenly during a slider sweeping over a disk
    a sweep zone of the disk surface after the test shows damage, such as cross scratches. It is found that disk damage results in not only environmental contamination but also scratch resistance of a disk. This damage is broken out catastrophically. Finally, a mechanism of catastrophic damage is discussed.

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  • Lubrication Mechanism of PFPE Lubricant on Magnetic Disks in Head Disk Interface

    H. Tani

    2001 

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  • Adsorption Model of PFPE Lubricanton Magnetic Disks

    H. Tani, H. Matsumoto

    2001 

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    Event date: 2001

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  • Molecular Weight Dependence of Lubricant on Performance of Magnetic Disk.

    H. Matsumoto, H. Tani, T. Nakakawaji

    2001 

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    Event date: 2001

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  • Observation of PFPE lubricant film on magnetic disk surface by atomic force microscopy

    H Tani

    IEEE TRANSACTIONS ON MAGNETICS  1999.9  IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC

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    Event date: 1999.9

    Language:English  

    We observed how PEPE lubricant film formed to magnetic disk surface using AFM with a fluoride coated probe. We found that PEPE lubricant did not uniformly cover the carbon protective surface but concentrated in valleys of surface roughness. The lubricant film has one to two step structure and the first step height is almost as same as the radius of molecular gyration. After the pin-on-disk test, the lubricant step height decreased and the coverage increased, compared to the initial state.

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  • イオン液体を用いた摩擦制御システム構築への現状

    川田 将平, 呂 仁国, 小金沢 新治, 谷 弘詞, 佐々木 信也

    第5回ナノトライボロジー研究センターシンポジウム  2024.3 

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    Venue:電気通信大学   Country:Japan  

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  • タイヤ内面に取付けた圧電センサを用いたタイヤ路面間摩擦係数の推定

    谷 弘詞, 川上 凌, 川田 将平, 呂 仁国, 小金沢 新治

    日本機械学会年次大会2023  2023.9 

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    Venue:神奈川  

    S162-01

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  • Adsorption and Tribological Properties of Perfluoropolyether Lubricant Films Having Main-Chains With Different Carbon Number

    Hiroshi Tani, Yuki Yamaji, Ryosuke Sagata, Tomomi Hatta, Renguo Lu, Shinji Koganezawa, Norio Tagawa

    The 32nd ASME Annual Conference on Information Storage and Processing Systems (ISPS 2023)  2023.8 

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    Venue:Milpitas, CA  

    (2023) ISPS2023-109769.

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  • 電食防止軸受の開発

    谷 弘詞, 戸根勇也, 川田将平, 呂仁国, 小金沢新治

    日本トライボロジー会議2023春東京  2023.5 

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    Venue:東京  

    D7

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  • 摩擦帯電センサ組込軸受の開発

    谷 弘詞, 戸根勇也, 川田将平, 呂仁国, 小金沢新治

    日本トライボロジー会議2023春東京  2023.5 

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    Venue:東京  

    D8

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  • Effect of Humidity on Head Smear Generation in Head Assisted Magnetic Recording

    H. Tani, H. Kurafuji, N. Tagawa, S. Kawada, R. Lu, S. Koganezawa

    Intermag 2023  2023.5 

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    Venue:Sendai  

    (2023) OPA-07

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  • Arガスクラスターイオンビームを用いた超薄膜弾性率の測定

    谷 弘詞, 呂 仁国, 小金沢 新治, 多川 則男, 清水毅

    日本機械学会関西支部第98期定時総会講演会[支部賞受賞記念講演]  2023.3 

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    Venue:京都  

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  • 橋梁の構造健全性診断システムの開発

    寺井 駿矢, 小金沢 新治

    2022年度関西学生会学生員卒業研究発表講演会  2023.3 

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    Venue:京都  

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  • 電場における油性剤分子挙動のその場観察

    吴陳誠, 紺谷和史, 呂仁国, 川田将平, 谷弘詞, 小金沢新治

    日本機械学会関西支部2022年度学生員卒業研究発表講演会  2023.3 

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    Venue:京都  

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  • 摩擦発電機を用いた通過人数計測マットの開発

    信岡 祐哉, 川上 凌, 谷 弘詞, 川田 将平, 呂 仁国, 小金沢 新治

    日本機械学会関西支部2022年度関西学生会卒業研究発表講演会  2023.3 

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    Venue:京都  

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  • 潤滑油のトライボ化学分解に及ぼす摺動面電流の影響

    今井健人, 呂仁国, 川田将平, 谷弘詞, 小金沢新治

    日本機械学会関西支部2022年度学生員卒業研究発表講演会  2023.3 

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    Venue:京都  

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  • 並列圧電フィルムによるタイヤ摩耗の推定

    嶋内 友哉, 細田 昂希, 谷 弘詞, 川田 将平, 呂 仁国, 小金沢 新治

    2022年度関西学生会卒業研究発表講演会  2023.3 

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    Venue:京都  

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  • 潤滑油添加剤としてのフッ素フリーイオン液体の摩擦摩耗低減メカニズム

    森下真琴, 川田将平, 呂仁国, 小金沢新治, 谷弘詞, 増田 現

    2022年度関西学生会卒業研究発表講演会  2023.3 

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    Venue:京都  

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  • 橋梁の健全性診断のための自立型振動センサの発電性能の改善

    池田 幸穂, 小金沢 新治, 谷 弘詞, 呂 仁国, 川田 将平

    情報・知能・精密機器部門講演会 IIP2023  2023.3 

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    Venue:北九州  

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  • Ar-GCIB を用いた HDI における有効弾性率測定

    谷 弘詞, 川田 将平, 呂 仁国, 小金沢 新治, 多川 則男

    情報・知能・精密機器部門講演会  2023.3 

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    Venue:北九州  

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  • ToF-SIMSによるポリフェニルエーテルのトライボ反応膜の解析

    紺谷和史, 吴陳誠, 呂仁国, 川田将平, 谷弘詞, 小金沢新治

    日本機械学会 情報・知能・精密機器部門講演会IIP2023  2023.3 

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    Venue:北九州  

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  • グラフェン保護膜の潤滑膜の吸着とヘッドスメアに関する研究

    河田 圭司, 谷 弘詞, 小金沢新治, 呂 仁国, 川田 将平

    情報・知能・精密機器部門講演会IIP2023  2023.3 

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    Venue:北九州  

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  • 並列配置型圧電フィルムによるタイヤ摩耗状態の推定

    細田 昂希, 嶋内 友哉, 谷 弘詞, 小金沢 新治, 呂 仁国, 川田 将平, 藤原 崇博, 杉岡 恭太, 黒田 賢一, 杉本 睦樹

    情報・知能・精密機器部門講演会 IIP2023  2023.3 

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    Venue:北九州  

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  • 電食防止軸受の開発

    谷 弘詞, 戸根 勇也, 川田将平, 呂 仁国, 小金沢 新治

    情報・知能・精密機器部門講演会 IIP2023  2023.3 

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    Venue:北九州  

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  • 摩擦発電マットを用いた入退室判別システムの開発

    川上 凌, 谷 弘詞, 小金沢 新治, 呂 仁国, 川田 将平, 黒木崇史, 中尾 凌, 南山 偉明

    情報・知能・精密機器部門講演会 IIP2023  2023.3 

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    Venue:北九州  

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  • イオン液体添加 PVDF ポーラス膜による摩擦発電出力の向上

    朱 洋威, 谷 弘詞, 小金沢新治, 呂 仁国, 川田 将平

    情報・知能・精密機器部門講演会 IIP2023  2023.3 

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    Venue:北九州  

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  • 橋梁振動波形解析による橋上通行車両の車種分析

    松本 楓太, 小金沢 新治, 谷 弘詞, 呂 仁国, 川田 将平

    情報・知能・精密機器部門講演会 IIP2023  2023.3 

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    Venue:北九州  

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  • カプセル内視鏡の自走化アクチュエータの研究

    一圓 貴晶, 小金沢 新治, 谷 弘詞, 呂 仁国, 川田 将平

    情報・知能・精密機器部門講演会 IIP2023  2023.3 

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    Venue:北九州  

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  • タイヤに組込んだ圧電フィルム出力による路面摩擦係数の推定

    川上 凌, 谷 弘詞, 川田 将平, 呂 仁国, 小金沢 新治

    第27回関西大学先端科学技術シンポジウム  2023.1 

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    Venue:大阪  

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  • 橋梁の健全性診断のための磁歪式振動センサの改良設計

    畑中雅也, 小金沢 新治, 谷 弘詞, 川田 将平, 呂 仁国

    第27回関西大学先端科学技術シンポジウム  2023.1 

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    Venue:大阪  

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  • レーザ加熱・交流電場下におけるDLC摩擦によるポリイン・グラフェン複合膜の生成

    谷弘詞, 泉谷裕毅, 池本真規, 川田将平, 呂仁国, 小金沢新治, 多川則男

    日本トライボロジー会議2022秋  2022.11 

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    Venue:福井  

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  • 潤滑油添加剤としてのイオン液体の開発

    川田将平, 呂仁国, 小金沢新治, 谷弘詞, 佐藤魁星, 宮武正明, 佐々木信也, 増田現

    トライボロジー会議2022 秋  2022.11 

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    Venue:福井  

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  • 橋梁の健全性診断のための自立型振動センサの改良設計

    畑中雅也、小金沢新治、谷弘詞、呂仁国、川田将平

    日本機械学会2022年度年次大会  2022.9 

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    Venue:富山  

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  • 適応制御によるHDD冷却ファン起因振動による位置決め誤差の低減

    船井健生、小金沢新治、谷弘詞、呂仁国、川田将平

    日本機械学会2022年度年次大会  2022.9 

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    Venue:富山  

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  • 熱分解GC/MSによるPFPE潤滑剤の熱分解分析

    谷 弘詞、館 健治、多川 則男、川田 将平、呂 仁国、小金沢 新治

    日本機械学会2022年度年次大会  2022.9 

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    Venue:富山  

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  • 電流印加時の潤滑油分子挙動のその場観察

    紺谷 和史、吴 陳誠、呂 仁国、川田 将平、谷 弘詞、小金沢 新治、多川 則男

    日本機械学会2022年度年次大会  2022.9 

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    Venue:富山  

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  • ヘッドディスクインターフェースから摩擦発電へ

    谷 弘詞

    日本機械学会2022年度年次大会  2022.9 

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    Venue:富山  

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  • 機械・インフラの保守・保全、信頼性強化 ~ 部門連携・学会連携への期待 ~[学会横断テーマ「機械・インフラの保守・保全,信頼性強化」情報・知能・精密機器部門

    谷 弘詞

    日本機械学会2022年度年次大会  2022.9 

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    Venue:富山  

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  • ヘッドディスクインターフェースから摩擦発電へ

    谷 弘詞

    日本機械学会2022年度年次大会  2022.9 

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    Venue:富山  

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  • 熱分解GC/MSによるPFPE潤滑剤の熱分解分析

    谷 弘詞, 館 健治, 多川 則男, 川田 将平, 呂 仁国, 小金沢 新治

    日本機械学会2022年度年次大会  2022.9 

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    Venue:富山  

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  • Relationship between lubricating properties and relative humidity under lubrication with ionic liquids

    Shouhei Kawada, Shunsuke Tanji, Jyo Kobayashi, Masaaki Miyatake, Shinya Sasaki, Renguo Lu, Shinji Koganezawa, Hiroshi Tani,

    THE 22ND INTERNATIONAL VACUUM CONGRESS (IVC-22)  2022.9 

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    Venue:Sapporo  

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  • EFFECT OF ELECTRIC CURRENT ON FRICTION BEHAVIOR OF LUBRICANT MOLECULES

    Renguo Lu, Kazufumi Kontani, Hiroshi Tani, Shohei Kawada, Shinji Koganezawa,Norio Tagawa

    2022 JSME-IIP/ASME-ISPS Joint International Conference on Micromechatronics for Information and Precision Equipment (MIPE2022)  2022.8 

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    Venue:Nagoya  

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  • Effects of Oxygen Concentration on Smear Formation in HAMR System

    Kenji Yakata, Hiroshi Kurafuji, Hiroshi Tani, Renguo Lu, Shinji Koganezawa, Shouhei Kawada, Norio Tagawa

    2022 JSME-IIP/ASME-ISPS Joint Conference on Micromechatronics for Information and Precision Equipment (MIPE2022)  2022.8 

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    Venue:Nagoya  

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  • External electric field effect to head smear generated from disk with PFPE lubricant film in heat-assisted magnetic recording

    Hiroshi Tani, Makoto Toyoda, Shouhei Kawada, Renguo Lu, Shinji Koaganezawa, Norio Tagawa

    2022 JSME-IIP/ASME-ISPS Joint Conference on Micromechatronics for Information and Precision Equipment (MIPE2022)  2022.8 

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    Venue:Nagoya  

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  • Elastic Modulus Measurement of Ultrathin Diamond-Like Carbon Film Using Gas Cluster Ion Beam

    Norio Tagawa, Hiroshi Tani, Shinji Koganezawa, Renguo Lu

    2022 JSME-IIP/ASME-ISPS Joint Conference on Micromechatronics for Information and Precision Equipment (MIPE2022)  2022.8 

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    Venue:Nagoya  

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  • “Improvement of self-powered vibration sensing device for structural health monitoring”

    Saho Ikeda, Masaya Hatanaka, Shinji Koganezawa, Shohei Kawada, Renguo Lu, Hiroshi Tani, Norio Tagawa

    2022 JSME-IIP/ASME-ISPS Joint Conference on Micromechatronics for Information and Precision Equipment (MIPE2022)  2022.8 

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    Venue:Nagoya  

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  • Monitoring radial load force of rolling bearing using triboelectric sensor

    Yuya Tone, Hiroshi Tani, Shinji Koganezawa, Renguo Ru, Shohei Kawada

    2022 JSME-IIP/ASME-ISPS Joint Conference on Micromechatronics for Information and Precision Equipment (MIPE2022)  2022.8 

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    Venue:Nagoya  

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  • Development of counting system of people passing on floor mat using triboelectric power generation

    Ryo Kawakami, Hiroshi Tani, Shohei Kawada, Rengo Lu, Shinji Koganezawa, Norio Tagawa 弘詞

    2022 JSME-IIP/ASME-ISPS Joint Conference on Micromechatronics for Information and Precision Equipment (MIPE2022)  2022.8 

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    Venue:Nagoya  

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  • Arガスクラスターイオンビームを用いた脂肪酸吸着膜の弾性率測定

    谷弘詞,川田将平,呂仁国,小金沢新治,多川則男

    トライボロジー会議2022春東京 オンライン  2022.5 

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    Venue:東京  

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  • 熱アシスト記録におけるヘッドスメア発生に対する外部電場の影響

    豊田弘詞, 川田 将平, 呂 仁国, 小金 眞實, 谷 沢 新治, 多川 則男

    2022.3 

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  • 熱アシスト磁気記録におけるヘッドスメア発生メカニズムに関する研究(湿度の影響)

    蔵藤 裕志, 谷 弘詞, 川田 将平, 呂 仁国, 小金沢 新治, 多川 則男

    2022.3 

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  • 交流電場中のDLC膜の摩擦特性

    池本 真規, 谷 弘詞, 呂 仁国, 小金沢 新治, 川田将平

    2022.3 

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  • 摩擦帯電センサを用いた転がり軸受のラジアル荷重モニタ

    戸根 勇也, 谷 弘詞, 小金沢 新治, 呂 仁国, 川田 将平, 多川 則男

    2022.3 

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  • 通過人数計測用摩擦発電マットの開発

    川上 凌,谷 弘詞,小金沢 新治,呂 仁国,川田 将平,多川 則男

    2022.3 

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  • Ar-GCIB法を用いた加熱された DLC薄膜のヤング率測定

    谷 弘詞,呂 仁国, 小金沢 新治,多川 則男

    2022.3 

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  • Ar-GCIBを用いた磁気ディスクの有効弾性率測定 1.

    谷 弘詞,呂 仁国, 小金沢 新治,多川 則男

    2022.3 

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  • 複数の摩擦帯電センサによるタイヤ摩耗状態の推定

    細田 昂希,谷 弘詞,呂 仁国,小金沢 新治, 川田 将平,多川 則男,藤原崇博, 杉岡恭太, 黒田 賢一,杉本 睦樹,中尾幸夫

    2022.3 

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  • 摩擦帯電センサを用いた転がり軸受のラジアル荷重モニタ

    岡崎 涼平,谷 弘詞,金沢 新治,呂 仁国,川田 将平,多川 則男

    2022.3 

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  • イオン液体添加PVDF複合膜による摩擦発電出力の向上

    朱 洋威,谷 弘詞,小金沢 新治,呂 仁国,川田 将平, 多川 則男

    2022.3 

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  • 摺動部の通電による脂環式カルボン酸減摩効果の向上

    紺谷和史,宮本 隆之介,呂仁国,川田 将平,谷弘詞,小金沢新治,多川則男

    2022.3 

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  • Arガスクラスターイオンビームを用いた吸着膜の弾性率測定

    谷 弘詞

    2022.3 

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  • 摩擦帯電センサによるタイヤ摩耗量の推定

    細田昂希,谷 弘詞,杉本 睦樹,藤原 崇博,杉岡 恭太,中尾 幸夫,川田 将平,呂 仁国,小金沢 新治,多川 則男

    2021.10 

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  • ポリフェニルエーテル系合成油のトライボロジー特性と分子構造の関係

    呂仁国,谷弘詞,小金沢新治,多川則男

    2021.10 

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  • 外部電場によるレーザ加熱されている DLC の摩擦係数制御

    谷 弘詞,泉谷 裕毅,呂 仁国,小金沢 新治,多川 則男

    2021.10 

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  • 光電子アシストCVD法で成膜した潤滑膜によるDLCスメアの低減

    谷 弘詞、呂 仁国、小金沢 新治、多川 則男

    2021.9 

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    光電子アシストCVD法で成膜した潤滑膜によるDLCスメアの低減

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  • 冷却ファンからの音圧による磁気ディスク装置筐体の振動の低減

    池田 幸穂,小金沢 新治,多川 則男,谷 弘詞,呂 仁国

    2021.9 

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    冷却ファンからの音圧による磁気ディスク装置筐体の振動の低減

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  • 表面増強ラマンを用いた加熱されたDLC表面の構造変化

    河田 圭司、谷 弘詞、呂 仁国、多川 則男、小金沢 新治

    2021.9 

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    表面増強ラマンを用いた加熱されたDLC表面の構造変化

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  • 通電時の潤滑特性に及ぼす潤滑油構造の影響に関する研究

    紺谷和史,呂仁国,谷弘詞,小金沢新治,多川則男

    2021.9 

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    通電時の潤滑特性に及ぼす潤滑油構造の影響に関する研究

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  • DLCにおける基油と添加剤の分子鎖長の相関性

    紺谷和史,呂仁国,谷弘詞,多川則男,小金沢新治

    2021.7 

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    DLCにおける基油と添加剤の分子鎖長の相関性

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  • Control of Head Smear Generated from Dlc Films Using an External Electric Field

    Hiroshi Tani, Renguo Lu, Shinji Koganezawa, Norio Tagawa

    2021.6 

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    Control of Head Smear Generated from Dlc Films Using an External Electric Field,

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  • “Electromagnetic energy harvester for transportation infrastructure using vehicle-tread force,”

    Shinji Koganezawa, Kota Morii, Hiroshi Tani, Renguo Lu, Norio Tagawa

    2021.6 

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  • タイヤ圧力モニタリングシステム用摩擦帯電発電機の開発

    谷弘詞,杉本睦樹,藤原崇博,杉岡恭太,中尾幸夫,呂仁国,小金沢新治,多川則男

    2021.5 

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    タイヤ圧力モニタリングシステム用摩擦帯電発電機の開発

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  • 加熱されたDLCからの炭化水素油生成プロセス

    谷弘詞,呂仁国,小金沢新治,多川則男

    2021.5 

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    加熱されたDLCからの炭化水素油生成プロセス

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  • 機械設計学入門

    2020.9 

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  • TOF-SIMS Analysis of Accumulated PFPE Lubricant Smear at Laser Heating

    谷 弘詞

    ISPS/MIPE 2018, San Francisco  2018.8 

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    Venue:San Francisco  

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  • Low-interaction Pseudo-contact HDI System (Experimental Study)

    Hiroshi Tani, Norio Tagawa

    2017.6 

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  • SiC表面分解法で作成したカーボンナノファイバーのトライボロジー特性の検討

    山下正博, 谷弘詞, 小金沢新治, 呂仁国, 多川則男

    日本機械学会情報・知能・精密機器部門  2016.3 

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  • 磁気ディスク上の超薄膜液体潤滑膜への電場中での紫外線照射

    谷弘詞, 坂根康夫, 小金沢新冶, 多川則男

    トライボロジー会議2014春  2014.5 

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    Venue:東京  

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  • 磁気ヘッドスライダのマイクロテクスチャによるスライダ振動の低減

    渡辺裕昭, 谷弘詞, 小金沢新治, 多川則男

    2014.3 

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    Venue:大阪府立大学  

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  • ヘッドディスクインターフェイス間の電場の潤滑剤ピックアップ特性への影響

    中井翔一, 谷弘詞, 多川則男, 小金沢新治

    2014.3 

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    Venue:大阪府立大学  

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  • クラッシュしたプラッタからのデータ修復技術

    谷 弘詞

    第3回デジタル・フォレンジック製品&トレーニング概要説明会  2013.9 

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  • DFH突出部にFIB加工を施したスライダの軽荷重接触HDIトライボロジーの研究

    富田淳, 谷弘詞, 小金沢新冶, 多川則男

    第4回マイクロ・ナノ工学シンポジウム  2012.10 

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    Venue:北九州  

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  • ピンオンディスク試験による磁気ディスク上の超薄膜液体潤滑膜の摩擦力・凝着力の測定

    谷弘詞, 満留利哉, 辻口雄介, 神田雅之, 多川則男

    日本機械学会2012年度年次大会  2012.9 

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    Venue:金沢  

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  • 軽荷重接触記録に及ぼす超薄膜液体潤滑膜の影響

    多川 則男, 谷 弘詞, 岩崎和巳

    日本機械学会2012年度年次大会  2012.9 

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    Venue:金沢  

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  • 異なる末端基を有する超薄膜PFPE潤滑膜を塗布した磁気ディスクの摩擦力・凝着力

    谷弘詞, 満留利哉, 多川則男

    日本トライボロジー学会トライボロジー会議予稿集(北海道室蘭2012-9)  2012.8 

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    Venue:室蘭  

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  • 表面ナノテクスチャーの方向と摩擦機構に関する研究

    高橋英之, 谷弘詞, 小金沢新治, 多川則男

    日本トライボロジー学会トライボロジー会議予稿集(北海道室蘭2012-9)  2012.8 

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    Venue:室蘭  

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  • 磁気ディスク上の薄膜液体潤滑膜の紫外線によるボンド機構に関する研究

    谷 弘詞, 北川裕章, 多川則男

    日本トライボロジー学会トライボロジー会議予稿集(東京2012-5)  2012.4 

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    Venue:東京  

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  • 熱アシスト磁気記録におけるPFPE潤滑剤のベーパ潤滑に関する基礎研究

    多川 則男, 谷 弘詞

    日本トライボロジー学会トライボロジー会議予稿集(東京2012-5)  2012.4 

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    Venue:東京  

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  • Fundamental Study of Thermal Stability of Nanometer-Thick Diamond-Like Carbon Films for Thermally Assisted Magnetic Recording

    Norio Tagawa, Hiroshi Tani, Takao Miki

    INTERNATIONAL CONFERENCE ON DIAMOND AND CARBON MATERIALS 

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    Venue:GRANADA, SPAIN  

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  • Estimation of tire wear using multiple tribocharge sensors mounted inside tire

    Koki Hosoda, Hiroshi Tani, Renguo Lu, Shinji Koganezawa, Shohei Kawada, Norio Tagawa, Takahiro Fujiwara, Kyota Sugioka, Kenichi Kuroda, Mutsuki Sugimoto, Yukio Nakao

    2022 JSME-IIP/ASME-ISPS Joint Conference on Micromechatronics for Information and Precision Equipment (MIPE2022) 

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    Venue:Nagoya  

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  • “An inclined-legs actuator inspired by Setaria viridis”

    Hotaka Tsuboi, Shinji Koganezawa, Hiroshi Tani, Renguo Lu, Shohei Kawada

    2022 JSME-IIP/ASME-ISPS Joint Conference on Micromechatronics for Information and Precision Equipment (MIPE2022) 

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    Venue:Nagoya  

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  • Adhesion and friction behaviors of probes approaching a magnetic disk surface

    Hiroshi Tani, Toshiya Mitsutome, Yusuke Tsujiguchi, Masayuki Kanda, Norio Tagawa

    Intermag 2012 

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    Venue:Vancouver  

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  • Fundamental study of vapor lubricantion by PFPE lubricants in thermally assisted magnetic redcording

    Norio Tagawa, Hiroshi Tani

    Intermag 2012 

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    Venue:Vancouver  

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  • Tribological characteristics of novel branched PFPE lubricant films in hard disk drives

    Norio Tagawa, Hiroshi Tani

    MIPE 2012 

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    Venue:Santa Clara, California, USA  

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  • Reduction in Adsorption of Bearing Oil From Fluid Dynamic Bearings of Hard Disk Drive Spindle Motor by Diamagnetism

    Hiroshi Tani, Ryosuke Habara, Norio Tagawa

    Intermag 2012 

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    Venue:Vancouver  

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Industrial property rights

  • 軸受、モータ、および状態検出システム

    谷 弘詞

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    Application no:特願2024-022331  Date applied:2024.2

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  • 軸受、モータ、および状態検出システム

    谷 弘詞

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    Application no:特願2023-172279  Date applied:2023.10

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  • 転がり軸受及びセンサ付き転がり軸受

    谷弘詞,袴田博之,澁谷勇介,山口創太

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    Application no:特許第7298837号  Date applied:2023.6

    Patent/Registration no:特許第7298837号  Date registered:2023.6 

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  • 磁気記録媒体の製造方法

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    Application no:特許第7292671号  Date applied:2023.6

    Patent/Registration no:特許第7292671号  Date registered:2023.6 

    谷弘詞,酒井浩志,山川栄進,進藤一樹

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  • タイヤ組立体、タイヤのモニタリングシステム及び方法

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    Application no:特許第7292644号  Date applied:2023.6

    Patent/Registration no:特許第7292644号  Date registered:2023.6 

    越智淳,杉本睦樹,谷弘詞

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  • 着用具、および身体に電流を供給する方法

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    Application no:特願2022-001151  Date applied:2022

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  • 通行量計測センサー

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    Application no:特願2022- 1554  Date applied:2022

    東洋アルミニウムとの共願

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  • 状態計測装置、センシング軸受、状態計測システム、状態計測方法、およ び状態計測プログラム

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    Application no:特願2022-13726  Date applied:2022

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  • Power generation body

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    Application no:US Patent 11,569,761  Date applied:2022

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  • タイヤの摩耗状態の推定方法,タイヤ接地状態の推定方法,タイヤの摩耗状態の推定システムおよびタイヤの接地状態の推定システム

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    Application no:特願2021-165111  Date applied:2021

    住友ゴム工業との共願

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  • 発電機能付軸受装置

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    Application no:特願2021-161140  Date applied:2021

    NTNとの共願

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  • 帯電フィルムおよび摩擦発電機

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    Application no:特願2021-207253  Date applied:2021

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  • 荷重検出機能付軸受装置

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    Application no:特願2020-037355  Date applied:2020

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  • 発電機能付軸受装置

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    Application no:特願2020-041262  Date applied:2020

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  • 発電体

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    Application no:特願2020-024033  Date applied:2020

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  • 発電体

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    Application no:特願2020-024032  Date applied:2020

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  • 磁気記録媒体の製造方法

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    Application no:特願2019-112236  Date applied:2019

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  • タイヤ組立体、タイヤのモニタリングシステム及び方法

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    Application no:特願2019-132038  Date applied:2019

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  • 転がり軸受及びセンサ付き転がり軸受

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    Application no:特願2019-043678  Date applied:2019

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  • タイヤ組立体

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    Application no:特願2018-135191  Date applied:2018

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  • Systems and methods for applying electric fields during ultraviolet exposure of lubricant layers for hard disk media

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    Application no:US Patent 9,953,665, 2018  Date applied:2018

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  • 状態計測装置

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    Application no:特願2018-038692  Date applied:2018

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  • 薄膜製造方法、磁気ディスクの製造方法およびナノインプリント用モールドの製造方法

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    Application no:特願2017-046316  Date applied:2017

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  • 発電体、発電装置及び圧力センサ

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    Application no:特願2017-093274  Date applied:2017

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  • ピボットアッシー用軸受装置およびこれを用いた磁気ヘッド駆動装置

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    Application no:特願2014-026694  Date applied:2014

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  • スピンドルモータおよびハードディスク駆動装置

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    Application no:特願2014-156394  Date applied:2014

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  • 撥水撥油性物品

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    Application no:特願2013-053698  Date applied:2013

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  • 磁気ディスク及び磁気記憶装置の復旧方法

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    Application no:特願2013-102816  Date applied:2013

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  • 2面間相互作用力あるいは摩擦力測定用の摺動子、及び摺動子の製造方法、及び測定装置

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    Application no:特願2010-236470  Date applied:2010

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  • 磁気記録媒体の製造方法及び磁気記録媒体の製造装置

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    Application no:特願2009-044432  Date applied:2009

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  • 小型高感度微小傾斜検出器

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    Application no:特願平11-336090  Date applied:1999

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  • 情報記憶再生媒体、情報記憶再生装置並びに磁気ディスク、磁気ディスク装置、潤滑剤分子量制御法、潤滑剤分子量制御装置

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    Application no:特願平11-125022  Date applied:1999

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  • 潤滑剤分子量制御法並びに磁気ディスク,磁気ディスク装置

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    Application no:特願平11-339288  Date applied:1999

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  • スクラッチ強度試験装置および試験方法

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    Application no:特願平11-273789  Date applied:1999

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  • 原子間力顕微鏡、それを用いた表面形状の測定方法及び磁気記録媒体の製造方法

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    Application no:特願平10-330564  Date applied:1998

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  • 磁気ヘッド及びその製造方法並びに磁気ディスク装置

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    Application no:特願平10-192660  Date applied:1998

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  • 磁気ディスクの表面欠陥検出装置及び摩擦試験装置

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    Application no:特願平10-237623  Date applied:1998

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  • 記録再生装置及びその装置の製造方法

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    Application no:特願平10-109620  Date applied:1998

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  • 磁気ヘッド及び磁気ディスク装置

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    Application no:特願平10-250704  Date applied:1998

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  • 磁気記録媒体および磁気記録媒体の製造方法

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    Application no:特願平10-128473  Date applied:1998

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  • 記録再生装置

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    Application no:特願平10-193962  Date applied:1998

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  • 記録再生装置

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    Application no:特願平10-199027  Date applied:1998

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  • 磁気ディスク用基板、磁気ディスク媒体、磁気ディスク媒体製造装置、及び磁気ヘッド

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    Application no:特願平09-275526  Date applied:1997

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  • スライダ及び磁気ディスク装置

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    Application no:特願平09-100005  Date applied:1997

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  • 磁気ヘッドおよびその製造方法及び磁気ディスク装置

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    Application no:特願平09-024791  Date applied:1997

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  • 磁気記録媒体及びその製造方法

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    Application no:特願平09-128280  Date applied:1997

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  • 磁気ヘッド及びそれを用いた磁気記録装置

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    Application no:特願平09-171462  Date applied:1997

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  • 磁気ディスク装置と磁気記録媒体及び磁気記録媒体の製造方法

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    Application no:特願平09-134725  Date applied:1997

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  • 記録ディスクの製造方法,その製造装置及び記録ディスク

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    Application no:特願平09-271131  Date applied:1997

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  • 磁気ディスク装置及び磁気ディスク

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    Application no:特願平09-246860  Date applied:1997

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  • 磁気ディスク装置

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    Application no:特願平09-303990  Date applied:1997

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  • 磁気ヘッドスライダ及び該磁気ヘッドスライダの製造方法

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    Application no:特願平08-167102  Date applied:1996

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  • 磁気ヘッドスライダおよび磁気記録装置

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    Application no:特願平08-010649  Date applied:1996

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  • 磁気ヘッドおよび磁気ディスク装置

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    Application no:特願平08-060580  Date applied:1996

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  • 磁気ヘッド

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    Application no:特願平08-025012  Date applied:1996

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  • 吸着防止磁気ヘッド

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    Application no:特願平08-162727  Date applied:1996

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  • 磁気記録媒体及びその製造方法

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    Application no:特願平08-150704  Date applied:1996

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  • 磁気ディスク装置

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    Application no:特願平08-249757  Date applied:1996

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  • 磁気ヘッド

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    Application no:特願平07-210417  Date applied:1995

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  • 磁気記録媒体

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    Application no:特願平07-012177  Date applied:1995

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  • 磁気ディスク媒体

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    Application no:特願平07-033324  Date applied:1995

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  • 磁気ディスク媒体の欠陥検査方法

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    Application no:特願平07-033325  Date applied:1995

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  • 磁気記録媒体の製造方法及び磁気記録再生装置

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    Application no:特願平07-020022  Date applied:1995

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  • コンタクト型磁気ヘッドおよび磁気ディスク装置

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    Application no:特願平07-051376  Date applied:1995

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  • 磁気ディスク装置、磁気ディスクおよび磁気ディスクの製造方法

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    Application no:特願平06-036723  Date applied:1994

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  • 磁気ディスク装置

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    Application no:特願平06-177992  Date applied:1994

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  • 磁気記録媒体

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    Application no:特願平06-195122  Date applied:1994

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  • 磁気記録媒体及び磁気記憶装置

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    Application no:特願平05-334622  Date applied:1993

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  • 磁気ディスク装置

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    Application no:特願平05-334621  Date applied:1993

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  • 磁気記録媒体

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    Application no:特願平05-196165  Date applied:1993

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  • 磁気ディスク基板、磁気ディスク、磁気ディスク装置及び磁気ディスク基板の製造方法

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    Application no:特願平05-026327  Date applied:1993

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  • 磁気ディスク

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    Application no:特願平04-230311  Date applied:1992

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  • 磁気ディスク及びその製造方法並びに磁気ディスク装置

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    Application no:特願平03-275193  Date applied:1991

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  • 磁気記録媒体、磁気記録媒体の製造方法、磁気記録媒体の製造装置及び磁気記録装置

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    Application no:特願平03-154351  Date applied:1991

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  • 磁気記録媒体

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    Application no:特願平02-230702  Date applied:1990

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  • 磁気記録再生装置

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    Application no:特願平02-011935  Date applied:1990

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  • 磁気ディスク装置

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    Application no:特願平01-241965  Date applied:1989

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  • 磁気記録媒体及びその製造方法

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    Application no:特願平01-035069  Date applied:1989

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  • 磁気ディスク装置の駆動方法

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    Application no:特願平01-060956  Date applied:1989

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  • 磁気ディスク

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    Application no:特願昭62-323928  Date applied:1987

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  • 発電機能付軸受装置

    谷 弘詞, 袴田 博之, 山口 創太

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    Patent/Registration no:特許特許第7397441号  Date registered:2023.12 

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  • 発電体

    杉本 睦樹, 谷 弘詞

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    Patent/Registration no:特許第7432889号  Date registered:2024.2 

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  • ROLLING BEARING AND SENSOR-EQUIPPED ROLLING BEARING

    Hiroshi Tani, Hiroyuki Hakamata, Yusuke Shibuya, Sota Yamaguchi

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    Patent/Registration no:特許US20220154774A1  Date registered:2024.1 

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Awards

  • 日本機械学会情報知能瀬光機器部門 優秀研究講演賞

    2024.3   日本機械学会  

    谷 弘詞

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  • 2022年度日本機械学会関西支部賞研究賞

    2023.3   日本機械学会  

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  • 日本機械学会IIP部門功績賞(部門賞)

    2023.3   日本機械学会  

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  • 防災・減災×サステナブル大賞 防災・減災×SDGs賞 アカデミー&ジュニアアカデミー部門ジャパン賞

    2022   減災サステナブル技術協会  

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  • サステナブル大賞2022

    2021.3   防災・減災  

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  • 日本機械学会 フェロー

    2020  

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  • Best Paper Award at the 28th ASME Annual Conference on Information Storage and Processing Systems 2019年6月

    2019   Storage and Processing Systems Division ASME  

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  • Best Paper Award at the 29th ASME Annual Conference on Information Storage and Processing Systems 2019年6月

    2019   Information Storage and Processing Systems Division ASME  

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  • 日本機械学会 情報・知能・精密機器部門,部門貢献表彰

    2015  

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  • 情報ストレージ研究推進機構 SRC論文賞2011

    2012  

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  • 日本機械学会情報知能精密部門 優秀講演論文賞

    2011  

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  • 日本トライボロジー学会賞 技術賞

    2011  

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Research Projects

  • Improvement of triboelectricf power generator output and study of tribological phenomena in large electricfield

    Grant number:21H01240  2021.4 - 2024.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

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    Grant amount:\17680000 ( Direct Cost: \13600000 、 Indirect Cost:\4080000 )

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  • Development of photoelectron assisted organic thin film CVD and ultrathin DLC hybrid lubricant film

    Grant number:15H02216  2015.4 - 2018.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

    Tani Hiroshi

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    Grant amount:\44720000 ( Direct Cost: \34400000 、 Indirect Cost:\10320000 )

    Objectives in this study are to develop the ultrathin diamond like carbon(DLC) hybrid lubricant film with PFPE film deposited by the photoelectron assisted chemical vapor deposition method using the phenomenon that organic monomer gas molecules capture photoelectrons emitted from the DLC surface applied a bias voltage. Specifically, in order to increase the recording density of hard disk drives, we developed (1) hybrid lubricant film by atmospheric photoelectron assisted UV irradiation, (2) the photoelectron assisted organic thin film CVD method, (3) ultrathin DLC hybrid lubricant film. Then, (4) Tribochemical reaction of DLC film and lubricant &middot; additive related with triboelectrons was studied.

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  • Study on thermal stubility of ultra-thin DLC thin films due to rapid laser heating

    Grant number:24360063  2012.4 - 2015.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    TAGAWA Norio, TANI Hiroshi

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    Grant amount:\19240000 ( Direct Cost: \14800000 、 Indirect Cost:\4440000 )

    Thermal stability and degradation of DLC thin films and ultra-thin liquid lubricant films on conventional magnetic disk surfaces due to rapid laser heating were investigated, using Raman microscope. The effects of high temperature caused by laser heating and inert gas environments were elucidated experimentally. In addition, we developed a novel plasmon sensor and it became possible to evaluate more detailed Raman spectroscopy analysis using our novel plasmon sensors, by increasing the intensity of Raman scattered light.

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  • Study to inovate molecularly ultra-thin lubricant monolayer on surfaces with ultra-low adhesion and high durability

    Grant number:24360062  2012.4 - 2015.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    TANI Hiroshi, TAGAWA Norio

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    Grant amount:\18590000 ( Direct Cost: \14300000 、 Indirect Cost:\4290000 )

    The film structure of ultra-thin perfluoropolyether lubricant film adsorbed on solid surfaces and the micro/nano textured surfaces were studied in order to achieve the molecularly ultra-thin lubricated surface with the low adhesion and high durability. As the results, (1) the coverage of lubricant film less than the monolayer thickness much affects to the adhesion and friction forces, and (2) the flexibility of lubricant molecules on rigid surfaces with lubricant film thicker than the monolayer affects to the friction coefficient. Furthermore, the photoelectron assisted ultraviolet irradiation process was developed to improve the coverage and chemical bonded ratio of lubricant film, and it was confirmed that the hole pattern texture showed much higher oil repellency.

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  • Development of deta recovery technology from crushed hard disk drives

    Grant number:24656115  2012.4 - 2014.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Challenging Exploratory Research

    TANI Hiroshi

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    Grant amount:\4030000 ( Direct Cost: \3100000 、 Indirect Cost:\930000 )

    techniques of the data recovery from crushed hard disk drives were studied as follows, (1)the wash process to reduce the adhered particles on disk surface, (2)the cleaning processes of wear particles on disk surface using polishing tape and vertically alinged carbon nanotube burnishing head, (3)re-coating process of lubricant film on magnetic disks, and (4)comparison of data recovery rate using tape cleaning process. Finally, we confirmed these datarecovery techniques were much effective to improve the data recovery rate.

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Social Activities

  • 日本機械学会IIP部門 総務部委員会委員長

    2022

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  • 日本機械学会 関西支部 代表会員

    2021 - 2022

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  • 日本機械学会IIP部門 部門長

    2021

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  • 日本機械学会 学術編修部会邦文 委員

    2019 - 2022

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  • 日本機械学会IIP部門 IoT技術に関する研究分科会 主査

    2019 - 2021

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  • 日本機械学会 英文ジャーナル 委員

    2019 - 2020

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  • 日本機械学会IIP部門 編集委員会 委員長

    2019

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  • 吹田市地元企業協同研究開発事業審査会 委員

    2018.7 - 2021.6

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  • おおさか地域産業資源活用助成審査 審査員

    2018.7 - 2021.3

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  • 日本機械学会IIP部門 事業委員会 委員長

    2018

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  • 関西大学 知財センター長

    2017.10 - Present

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  • 関西大学 産学官連携センター長

    2017.10 - 2020.9

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  • 関西大学社会連携部 副部長

    2017.10 - 2020.9

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  • 日本トライボロジー学会 編集委員会 委員長

    2017

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  • 日本機械学会IIP部門 広報委員会 委員長

    2017

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  • 関西大学機械工学科 教育主任

    2016.4 - 2017.3

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  • 日本トライボロジー学会 理事

    2016 - 2017

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  • 日本トライボロジー学会 編集委員会 副委員長

    2016

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  • 日本機械学会IIP部門 学術委員会 委員長

    2016

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  • 日本機械学会IIP部門 学術委員会 副委員長

    2015

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  • 日本機械学会 関西支部 商議員

    2014 - 2015

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  • 日本機械学会IIP部門 MIPE2015実行委員会 幹事

    2013 - 2015

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  • 日本機械学会 関西支部 代議員

    2009 - 2012

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  • 日本機械学会IIP部門 情報・知能・精密機器(ⅡP)部門 運営委員

    2009

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Devising educational methods

  • 講義として、ナノマイクロトライボシステム概論、ナノ表面制御・分析工学概論の二つを2009年から行っている。いずれの講義においても、テキストと論文とを並行させて生徒に予習してもらい、授業時間内で他の生徒に理解してもらうというスタンスで発表してもらっている。さらに、それを聞いた生徒はその発表に対して質問することを義務付けており、この授業の流れの中で、専門知識の習得はもちろん、人に理解してもらえる発表技術の習得、質問するために考える技術の習得を促している。さらに、期末のレポートでは、授業内でレビューした論文や他の論文に基づいて、自分で発想したアイデアを特許明細書と言う形でまとめてもらう。こうすることで、エンジニアに必要な独創性、物を作るための方法、技術、プロセスについて考える機会を与え、自分で考えることの大事さを学んでもらっている。 研究室の研究では、毎週1度のゼミでの発表と個別の進捗状況報告と議論とを各学生に課し、学生毎の研究への意欲向上と、方向付け、考え方の指導を行っている。講義、研究指導、どちらも社会に出た時にエンジニアとして必要な考え方、基礎知識を与えることを目標として取り組んでいる。

Teaching materials

  • ? ナノマイクロトライボシステム概論:トライボロジーの基礎(加藤泰久・益子正文:培風館)一般的なトライボロジーのみならず、マイクロスケールのトライボロジーについての記載があるため、テキストとして使用している。別途、関連する最新の論文をその都度用意している。 ? ナノ表面制御・分析工学概論:表面分析ハンドブック(コベルコ科研編)表面の代表的な分析手法を簡単にまとめてあり、分かりやすい例もあるのでテキストとして使用している。別途、関連する最新の論文をその都度用意している。

Teaching method presentations

  • ? ヘッドディスクインターフェースにおけるベーパー潤滑に関する研究, 岡野孝彦D, 多川則男, 谷弘詞, IIP2010, A-4, 2010. ? 磁気ヘッドスライダ面上の潤滑膜厚分布計測による潤滑剤ピックアップ現象の可視化, 谷弘詞, 久保田昌美(クボタコンプス), 辻口裕介(クボタコンプス), 多川則男, IIP2010, A6, 2010. ? AFMを用いたプローブと超薄膜液体潤滑膜との相互作用に関する研究, 福永隆二D, 多川則男, 谷弘詞, IIP2010, A10, 2010. ? 軽荷重接触記録におけるHDI不安定性に関する研究, 山口登夢D, 多川則男, 谷弘詞, IIP2010, A12, 2010. ? 光アシスト磁気記 におけるヘッドディスクインターフェースに関する研究, 上田健司D, 多川則男, 谷弘詞, IIP2010, A16, 2010. ? 微細周期構造上のDLC膜のトライボロジー特性~周期構造形状の乾燥摩擦への影響~宗澤健一D, 多川則男,谷弘詞, 機械学会関西支部第85期定時総会, 412, 2010. ? 磁気ディスクにおけるPFPE潤滑剤を塗布した垂直配向CNT膜のトライボロジー特性, 森益太郎D, 谷弘詞, 多川則男, 楠美智子, 機械学会関西支部第85期定時総会, 413, 2010. ? 多層光ディスク用アクティブ収差補正マイクロアクチュェータ機構に関する研究, 藤原仁D, 多川則男, 谷弘詞, 機械学会関西支部第85期定時総会, 616, 2010.

Special notes on other educational activities

  • 出張講義:12月10(金)13:30~14:30(60分講義)派遣先:上宮太子高等学校 講義内容:身近なトライボロジー