Numerical Analysis of Surface Force of Diamond-Like-Carbon Surface Covered with Monolayer Lubricant Film

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  • 単分子潤滑膜で被覆されたDiamond-Like-Carbon面の表面力の理論的解明
  • タンブンシ ジュンカツマク デ ヒフク サレタ Diamond-Like-Carbonメン ノ ヒョウメンリョク ノ リロンテキ カイメイ

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Abstract

<p>Diamond-like-carbon (DLC) is widely used as a hard protective layer with a relatively low surface energy. In the head/disk interface in magnetic disk storages, however, monolayer perfluoro-polyether lubricant with a high bond ratio is coated on DLC to avoid DLC‒DLC contact to secure head/disk wear reliability. This paper theoretically analyzes the effect of lubricant thickness and bond ratio on the adhesion force between head and disk surfaces in a sub-nanometer thickness regime. It was found that although the adhesion force can be reduced by increasing bond ratio to one, the adhesion force has the lowest sensitivity to lubricant thickness variations at 0.85 bond ratio. In addition, the maximum adhesion force can be minimized when lubricant thickness is ～0.6nm. This suggests that the current lubricant thickness of 1.0-1.2nm can be reduced to 0.6nm accompanying with a slight decrease in the adhesion force and a slight increase in allowance to lubricant thickness variation. This tribo-surface design concept can be applied to other fields such as micro/nano electrical-mechanical systems.</p>

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