Fluctuation-dissipation considerations and damping models for ferromagnetic materials

Abstract

The role of fluctuation-dissipation relations (theorems) for the magnetization dynamics with Landau-Lifshitz-Gilbert and Bloch-Bloembergen damping terms are discussed. We demonstrate that the use of the Callen-Welton fluctuation-dissipation theorem that was proven for Hamiltonian systems can give an inconsistent result for magnetic systems with dissipation.

References in corpus (3)

• Tensor form of magnetization damping
• Non-uniform thermal magnetization noise in thin films: application to GMR heads
• Local Relaxation and Collective Stochastic Dynamics

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