Thermal Effects in the High-Speed Switching of the Magnetization of Fine Grains

概要

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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 $v_{1}$ of the relative head-medium velocity. In the thermal regime ($v<v_{1}$), the gyromagnetic precession enhances the energy barrier of reversal. In the dynamic reversal regime ($v>v_{1}$), the thermal reduction of the write coercivity is independent of the velocity.
INSTITUTE OF PURE AND APPLIED PHYSICSの論文
2003-04-15