浮動ヘッドスライダの近接・接触領域におけるマイクロウエービネス励起振動の解析

抄録

Vibration characteristics of a head slider in hard disk drives in proximity and contact regimes becomes important because head-disk spacing must be decreased to less than 1 nm in order to increase recording density. This study first elucidates head-disk interfacial (HDI) force as a function of static head spacing based on rough surface adhesion contact models and air-bearing force model. Then, selecting the most probable surface force model, microwaviness (MW)-excited vibration of single-degree-of-freedom slider model was simulated by Runge-Kutta method. It was found that the slider snaps-into a contact state at a certain flying spacing but it snaps-out to a flying state when static head spacing is further decreased by increasing heater power. When MW amplitude is large, a large spacing variation which contains low frequency components of less than 100 kHz appears in this unstable region. It was discussed that these calculated results help us understand the mechanisms of various prior experimental evidences.