Dynamic Viscoelastic Measurement of Monolayer Lubricant Films Using an Oscillating Optical Fiber Probe(Mechanical Systems)

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  • HAMAMOTO Yuya
    Department of Mechanical and Science Engineering, Nagoya University
  • ITOH Shintaro
    Department of Mechanical and Science Engineering, Nagoya University
  • FUKUZAWA Kenji
    Department of Mechanical and Science Engineering, Nagoya University
  • ZHANG Hedong
    名古屋大学大学院情報科学研究科

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Other Title
  • 光ファイバープローブを用いた単分子厚さの液体潤滑薄膜の動的粘弾性計測(機械力学,計測,自動制御)
  • 光ファイバープローブを用いた単分子厚さの液体潤滑薄膜の動的粘弾性計測
  • ヒカリ ファイバー プローブ オ モチイタ タンブンシ アツサ ノ エキタイ ジュンカツ ハクマク ノ ドウテキネンダンセイ ケイソク

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Abstract

To increase the recording density of hard disk drives (HDDs), the gap between the magnetic head and the disk must be reduced less than 10nm. Due to the reduced gap, a lubricant film which is coated on the disk must be a monolayer with a thickness of 1-2nm and it should play more significant role in the lubrication of the head disk interface (HDI). For the lubrication design of the HDI by using monolayer lubricant films, it is essential to evaluate those viscoelastic properties under a shearing motion. However, a method that can be applied to the viscoelastic measurement of such a thin film has not yet been established. In our previous study, we have developed a highly sensitive shear force measuring method that utilized a ball-ended optical fiber as a shearing probe, which we called the fiber wobbling method (FWM). In this study, we expanded the capability of the FWM and achieve the viscoelastic measurement of monolayer lubricant films by developing new methods which realized the highly accurate gap control of 0.1nm order.

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