Effects of the Structure of NiP/Al Substrate on Shock Resistance

Abstract

The effects of the structure of a conventional NiP/Al substrate on shock resistance were investigated. In this study, a 2.5-inch-type hard disk drive with a thin-film 70%-micro-slider head was used. The tested shock was supplied by a pendulum shock-testing machine with a half-sine shock pulse and a duration of l.0 ms. We defined the shock resistance as the maximum acceleration in a shock for which head slap was not formed. The results showed that the shock resistance increased with increasing hardness of the Al alloy and thickness of the NiP underlayer.