Combined Effects of Surface Roughness Mode and Accommodation Coefficient of Air-Bearing Film in the Head/Disk Interface

In a modern hard disk drive (HDD), when the spacing between slider and disk is on the order of 1 or 2 nm, the gaseous rarefaction effects, surface roughness, and surface accommodation effects must be taken into account. Effects of gaseous rarefaction with either surface roughness or surface accommodation were reported in literature. However, only a few of the published works have considered the combined effects simultaneously. This paper investigates the combined effects of the surface roughness mode and the surface accommodation as well as the gaseous rarefaction effects on the static characteristics of the air-bearing film in both the cases of symmetric molecular interaction and asymmetric molecular interaction.