Study of formation and development of lubricant bridge in head-disk interface using molecular dynamic method

Abstract

The lubricant bridge connecting the slider and disk will significantly deteriorate the read-write stability of the hard disk drive (HDD). This paper builds a model of disk-lubricant-slider system. The coarse-grained bead-spring model is used to represent perfluoropolyethers (PFPE) molecules. And the molecular dynamic method is used to study the formation time and the molecule number of the lubricant bridge under different disk rotation speeds and slider flying heights. Furthermore, the influence of lubricant bridge on the pressure acting on the slider pad is also studied. Index Terms -Head disk interface, lubricant bridge, molecular dynamic method