P-HDI-03 Effect of Lubricant on Glide Avalanche Height and Slider Vibration

概要

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We experimentally investigated the effect of lubricant on both the glide avalanche height of disks and slider vibration due to slider-lubricant contacts using a flying height tester equipped with an acoustic emission (AE) sensor. Unfinished glass disks, which are used as magnetic disk substrates, are also used in flying height measurements. the glide avalanche height of the glass disk was defined as the flying height at which the AE signal increased sharply as flying height or disk velocity decreased. We also made use of glass substrates from the same manufacturing lot that were coated with diamondlike carbon, lubricated with perfluoropolyethers and annealed at various conditions to adjust the thickness and the bonding ratio. These lubricated glass disks were placed in the flying height tester and the AE signal was monitored as a function of disk velocity using the same slider. We determined that the lubricant thickness should be reduced to decrease the glide avalanche height and the bonding ratio should be increased to reduce slider vibration.