Effect of molecular structure of PFPE lubricant on interaction at HDI in near contact operation

摘要

In magnetic hard disk drives, spacing between flying head and rotating disk is reaching below 5nm in order to achieve ultra high recording density over 300Gbit/inch2, At this extremely narrow head-disk spacing, reducing adhesive force between the head and disk is a dire requisite for the long-term reliability of the drive. In this study, we investigated the effect of molecular structure of the PFPE (per-fluoro-poly-ether) lubricant upon the adhesive force between the head and disk. In particular, we compared the head-disk adhesive forces experienced when lubricants of the same backbone terminated with a functional group at one and at both ends, respectively, were used.