A novel laser bump design for low glide/low stiction disk

Abstract

The effects of different geometry of the laser bump in contact start/stop (CSS) and glide avalanche performance were investigated. Traditionally, a lower laser bump height can reduce the glide avalanche, but if the height is lower than a specific value there will appear a “stiction barrier‘’. In order to overcome this barrier, a novel design of obtaining cavities on the disk is proposed. In this design, changing the depth and relative position of the laser bump can obtain a lower stiction and glide avalanche. The effects of lubricant film thickness and environmental temperature/humidity were also observed.