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Time Dependence of Magnetic Anisotropy at Finite Temperature for Homogeneous and Composite Media

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3 Author(s)
Pin-Wei Huang ; Dept. of Electr. & Comput. Eng., Univ. of Minnesota, Minneapolis, MN, USA ; Xi Chen ; Victora, R.H.

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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Magnetics, IEEE Transactions on  (Volume:48 ,  Issue: 11 )