Contact Hysterisis Behavior of Textured Pad Slider in Head-Disk-Interface

摘要

The magnetic disk recording is considered to be the most useful storage system in recent days. In order to increase recording density, fly height of magnetic head is to be reduced, as much as possible. However, the reduction of fly height is limited by the interference in head-disk-interface, like as a large slider vibration at a head contact on smooth disk surface. J. Xu et. al.1,2 and L. Zhou et. al.3 investigated a textured head slider, that showed smaller head vibration at contact. K. Ono et. al. 4 analyzed the bouncing vibration of a slider in near- contact regime by considering a friction force as well as attraction force. Their freedom model with two-degrees including pitch and vertical motions could describe the slider bouncing vibration induced by slider-disk contact. However, their model includes the friction coefficient as unknown parameter, so we can't estimate directly how the slider vibration is on disks with different friction force. We studied about this phenomenon by simulation of slider vibration with based on stick-slip analysis, and resulted that the contact hysterisis became smaller as the friction force decreased. In order to confirming that simulation result, several types of textured pad slider by FIB fabrication were evaluated by touch down and take-off measurement.