Abstract
A numerical study of thermal effects on the high-speed switching of the magnetization of perpendicular recording media is presented. The Langevin equation is solved numerically to determine the magnetic response of a single grain during motion through the field profile of a single pole head. We evaluate the effective time of the thermal relaxation process and the thermal reduction of the write coercivity. A transition from thermally activated to dynamic reversal occurs at some critical value v1 of the relative head-medium velocity. In the thermal regime (v<v1), the gyromagnetic precession enhances the energy barrier of reversal. In the dynamic reversal regime (v>v1), the thermal reduction of the write coercivity is independent of the velocity.
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