Abstract
Regarding the measurement of dynamic characteristics of the lubricant bridge formed between the diamond tip and the magnetic disk surface, the accuracy in identifying the interference fringe has improved by employing a minute glass mirror in place of the silicon plate currently used, and the elongation and the adhesive force of 2-nm-thick PFPE lubricant films with/without the polar end group for different molecular weights have been compared. It was revealed that the mobile molecule of lubricant contributed to a larger elongation of the lubricant bridge and that the fixed molecule of lubricant to a decreased adhesive force. Furthermore, the same experiments with varying the bonding ratio of the polar lubricant Zdol2000 were performed. It was confirmed that the elongation and the adhesive force tended to decrease with the increasing bonding ratio.
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