Dynamics of Partial Contact Head Disk Interface

A nonlinear dynamic model is developed to analyze the bouncing vibration of partial contact air bearing sliders, which are designed for the areal density of 1 Tb/in². In this model, the air bearing with contact is modeled using the generalized Reynolds equation modified with the Fukui-Kaneko slip correction and a recent slip correction for the contact situation. The adhesion, contact, and friction between the slider and the disk are also considered in this model. The adhesion force is calculated using a modified intermolecular force model; the contact force is obtained through an elastic quasi-static contact model that considers the slider and disk roughness. Realistic measured roughness of the slider and the disk are used in the simulation. It is found that minimizing the trailing pad size can reduce the slider´s bouncing and crash likelihood. The surface roughness and adhesion have a strong effect on the slider´s bouncing vibration, while the friction between the slider and disk is found to have less effect