In today's hard disk drive systems, a lubricant film of around 1 -2 nm thick is applied over the carbon overcoat on hard disk surfaces. Molecularly thin lubricant film is required to have both the retention and replenishment functions to achieve ultra-low head/disk interface spacing. So far, liquid polymeric films of PFPE lubricant such as Zdol have been used. On the other hand, new lubricant has been developed in order to improve further the durability of head/disk interface less than 10 nm. In this paper, the spreading characteristics of novel cyclotriphosphazine-terminated PFPE lubricant films on carbon surfaces are investigated experimentally by scanning micro-ellipsometry and clarified quantitatively. In addition, the comparison of the novel lubricant and conventional Zdol are discussed.
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