Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : March 14, 2017 - March 15, 2017
Vibration characteristics of a head slider in hard disk drives in proximity and contact regimes attracts strong interest because head-disk spacing must be decreased to less than 1 nm in order to increase recording density. This study first e valuates head-disk interfacial force based on rough surface adhesion contact models and air-bearing force model. Then, microwaviness (MW)-excited vibration of single-degree-of-freedom slider model at touchdown was simulated by Runge-Kutta method. It was found that the slider exhibits a large spacing variation having low frequency components of less than 100 kHz near the boundary of with or without static unstable region. When a small static unstable region appears, occurrence of low frequency spacing variation is interrupted by temporal flying state (loss of contact). When the static unstable region further increases, low frequency spacing variation can appear only at the beginning of contact and contact vibration with a normal resonance peak appears in two spacing ranges separated by perfect flying (loss of contact) state. These calculated results are consistent with actual slider vibrations at touchdown process.
