Friction and wear issues in magnetic recording

Abstract

Magnetic recording is accomplished by the relative motion between a read/write head and a magnetic medium. Flying heights are roughly 5-15 micro inches which are on the order of surface roughnesses of the mating members. The need for higher and higher recording densities requires that surfaces be as smooth as possible and flying heights be as small as possible. Smoother surfaces at low flying height lead to an increase in friction and interface wear. All magnetic media have to be sufficiently lubricated to minimize head and medium wear. A review is presented of the theories of friction, wear, and lubrication relevant to magnetic recording. Examples of both polymeric and nonpolymeric magnetic media are presented.