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2005 Fiscal Year Final Research Report Summary

Development of nano-meter head-disk interface for the Tb/in^2 class ultrahigh-recording-density information storage systems

Research Project

Project/Area Number 15206019
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Research Field Design engineering/Machine functional elements/Tribology
Research InstitutionKansai University

Principal Investigator

TAGAWA Norio  Kansai University, faculty of Engineering, Professor, 工学部, 教授 (50298840)

Co-Investigator(Kenkyū-buntansha) KATO Takahisa  National Institute of AIST, Chief Scientist, 機械システム研究部門, 総括研究員 (60152716)
MORI Atsunobu  Kansai University, Faculty of Engineering, Professor, 工学部, 教授 (80026202)
ARAI Yasuhiko  Kansai University, Faculty of Engineering, Professor, 工学部, 教授 (80131415)
Project Period (FY) 2003 – 2005
Keywordsultra-high density data storage / hard disk drives / head-disk interface / nanotribology / ultra-thin liquid lubricant films / PFPE lubricant films / contact sliders / femtosecond laser processing
Research Abstract

In order to achieve more than 1Tb/in2 area recording density, it is necessary to develop nano-meter head disk interface (HDI) less than 10 nm. The goal of this research is to make clear the design guideline of next generation nano-meter spacing HDI. In addition, we studied the peculiar behavior of ultra-thin liquid lubricant films for contact sliders and developed the breakthrough technologies such as nanotextures fabricated by femtosecond laser processing on the air bearing slider surfaces to realize future contact recording. The obtained results are summarized as follows;
(1)The spreading characteristics of novel alkanolamine-terminated perfluoropolyether (PFPE) films as well as conventional lubricant films on carbon surfaces were investigated and evaluated experimentally by using a scanning micro-ellipsometer. The apparent diffusion coefficients of the novel lubricants were also studied and they were compared with the conventional lubricants. As a result, the effects of end-groups on … More the spreading characteristics of molecularly thin liquid lubricant films were clarified.
(2)The effects of molecularly thin liquid lubricant films on slider hysteresis behavior were investigated experimentally. In other words, the difference in the touchdown and takeoff velocities was monitored by varying the lubricant bonded ration and lubricant film thickness of the disks. As a result, it was suggested that the variation in the touchdown velocity is due to a variation in the intermolecular forces and that the variation in the takeoff velocity is caused by a variation in the friction forces between the slider and disk surface. In addition, the next generation design guideline was clarified for ultra-low spacing of less than 2-3 nm.
(3)The effects of ultra-thin liquid lubricant films on contact slider dynamics were investigated, using three types of lubricant, which have different end-groups and molecular weight as a function of lubricant film thickness. As a result, it was found that the lubricant film thickness instability occurs as a result of slider-disk contacts, when the lubricant film thickness is thicker than one monolayer. In addition, it is concluded that the lubricant film thickness should be designed to be one monolayer thickness region.
(4)A novel contact slider was proposed and developed. This has nanotextures fabricated by femtosecond laser processing. Contact experiments were also carried out using the fabricated sliders. The feasibility of the developed contact slider technology was confirmed for next-generation HDI design. Less

  • Research Products

    (13 results)

All 2007 2006 2005

All Journal Article (12 results) Patent(Industrial Property Rights) (1 results)

  • [Journal Article] Effects of ultra-thin liquid luvricant films on contact slider dynamics in hard-disk drives2007

    • Author(s)
      Norio Tagawa, Yoshiaki Tashiro, Atsunobu Mori
    • Journal Title

      Tribology International 40

      Pages: 770-779

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Effects of molecularly thin liquid lubricant films on slider hysteresis behavior in hard disk drives2007

    • Author(s)
      Norio Tagawa, Atsunobu Mori, Ken Senoue
    • Journal Title

      ASME Trans, Journal of Tribology To be published

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Effects of ultra-thin liquid lubricant films on contact slider dynamics in hard disk drives2007

    • Author(s)
      Norio Tagawa, Yoshiaki Tashiro, Atsunobu Mori
    • Journal Title

      Tribology International Vol. 40

      Pages: 770-779

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Effects of molecularly thin liquid lubricant films on slider hysteresis behavior in hard disk drives2007

    • Author(s)
      Norio Tagawa, Atsunobu Mori, Ken Senoue
    • Journal Title

      ASME Trans. Journal of Tribology

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Development of contact sliders with nanotextures by femtosecond laser processing2006

    • Author(s)
      N.Tagawa, M.Takada, A.Mori, H.Sawada, K.Kawahara
    • Journal Title

      Tribology Letters 24/2

      Pages: 143-149

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Development of contact sliders with nanotextures by femtosecond laser processing2006

    • Author(s)
      N.Tagawa, M.Takada, A.Mori, H.Sawada, K.Kawahara
    • Journal Title

      Tribology Letters Vol. 24, No.2

      Pages: 143-149

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Effects of Functional End-Groups on Nano-Tribology Characteristics of Ultra-Thin Liquid Lubricant Films in Hard Disk Drives2005

    • Author(s)
      Norio Tagawa, Atsunobu Mori
    • Journal Title

      IEEE Trans. MAGNETICS 41/2

      Pages: 825-830

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Interactions between nano-spacing flying head sliders and ultra-thin liquid lubricant films with non-uniform distribution in hard disk drives2005

    • Author(s)
      Norio Tagawa, Noritaka Yoshioka, Atsunobu Mori
    • Journal Title

      Microsystem Technologies 11

      Pages: 867-874

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Behavior of ultrathin liquid lubricant films for contact sliders in hard disk drives2005

    • Author(s)
      Norio Tagawa, Atsunobu Mori
    • Journal Title

      Tribology Letters 19/3

      Pages: 203-209

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Effects of Functional End-Groups on Nano-Tribology Characteristics of Ultra-Thin Liquid Lubricant Films in Hard Disk Drives2005

    • Author(s)
      Norio Tagawa, Atsunobu Mori
    • Journal Title

      IEEE Trans. MAGNETICS. Vol.41, No. 2

      Pages: 825-830

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Interactions between nano-spacing flying head sliders and ultra-thin liquid films with non-uniform distribution in hard disk drives2005

    • Author(s)
      Norio Tagawa, Noritaka Yoshioka, Atsunobu Mori
    • Journal Title

      Microsystem Technologies Vol. 11

      Pages: 867-874

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Behavior of ultrathin liquid lubricant films for contact sliders in hard disk drives2005

    • Author(s)
      N.Tagawa, A.Mori
    • Journal Title

      Tribology Letters Vol. 19, No. 3

      Pages: 203-209

    • Description
      「研究成果報告書概要(欧文)」より
  • [Patent(Industrial Property Rights)] 薄膜表面微細突起形成方法2005

    • Inventor(s)
      川原公介, 沢田博司, 多川則男
    • Industrial Property Rights Holder
      キャノンマシナリー
    • Industrial Property Number
      特許、特願2005-079891
    • Filing Date
      2005-03-18
    • Description
      「研究成果報告書概要(和文)」より

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Published: 2008-05-27  

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