Numerical Study of Spin Relaxation by Thermal Fluctuation: Effect of Shape Anisotropy

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Effects of the shape anisotropy on the thermally activated spin relaxation have been investigated using the stochastic Landau-Lifshitz-Gilbert equation. The relaxation times of a noninteracting particle and a thin film were compared with each other. In a noninteracting particle, the relaxation time largely increased with the shape anisotropy when the damping constant was smaller than a certain critical value. In this study, the critical damping constant was 0.02. However, the effect of the shape anisotropy on the energy barrier was negligible in a thin film. All of these results can be explained from the effect of magnetostatic interaction that is enhanced by precession motion at low damping constant. (C) 2001 American Institute of Physics.
Amer Inst Physics
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Article; Proceedings Paper

JOURNAL OF APPLIED PHYSICS, v.89, no.11, pp.7460 - 7462

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