Transition Characteristics of Longitudinal Heat-Assisted Magnetic Recording Systems

The current magnetic recording technology is approaching its theoretical boundary known as a super-paramagnetic limit. Heat-assisted magnetic recording (HAMR) is one of the promissing technologies enabling higher recording capacity beyond this limit. In HAMR, the heat is applied in a medium during writing process resulting unique transition characteristics if compared to a conventional scheme. In this paper, we investigate the effect of different parameters, including the peak temperature, medium coercivity, a write head gap, a deep gap field, and a distance from pole to medium (or a fly height), on the transition characteristics of the longitudinal HAMR system. Numerical results indicate that there exists an optimal parameter setting which minimizes the transition enter and the transition parameter so as to provide high storage capacity.