Abstract
The role of ambient air, nitrogen and water on the frictional behavior of a micro-contact recording head against an amorphous nitrogenated carbon (a-C:N) overcoat disk was investigated. Water was found to play a major role in the time evolution of the friction between the disk and diamond-like carbon wear pads. No substantial differences between friction with and without oxygen in the system were noted. A long-term fixed track friction test in an extremely dry atmosphere showed friction force build-up over time and resulted in magnetically recorded side-band frequency increases due to similar beam vibration. Atomic force microscopy on a track in continuous sliding contact for 910 h revealed that the track summits became smooth over time. Lateral force microscopy of these summit areas showed high friction relative to unworn areas.
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