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The kinetic friction and wear at high sliding speeds is investigated usingthe head-disk interface of hard disk drives, wherein, the head and the disk areless than 10 nm apart and move at sliding speeds of 5-10 m/s relative to eachother. While the spacing between the sliding surfaces is of the same order ofmagnitude as various AFM based fundamental studies on friction, the slidingspeed is nearly six orders of magnitude larger, allowing a unique set-up for asystematic study of nanoscale wear at high sliding speeds. In a hard diskdrive, the physical contact between the head and the disk leads to friction,wear and degradation of the head overcoat material (typically diamond likecarbon). In this work, strain gauge based friction measurements are performed;the friction coefficient as well as the adhering shear strength at thehead-disk interface are extracted; and an experimental set-up for studyingfriction between high speed sliding surfaces is exemplified.

Nanoscale wear and kinetic friction between atomically smooth surfaces sliding at high speeds