Abstract
A simple torque-based method for calculating the transient behavior of temperature-dependent magnetic anisotropy is introduced. Using this method we obtain several physical quantities at finite temperature, including effective anisotropy, anisotropy field, and their fluctuations, that are crucial to heat-assisted magnetic recording (HAMR). We show that use of a composite grain that includes a high Curie temperature soft layer reduces the anisotropy fluctuations.
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