Thermal magnetization fluctuations in thin films and a new physical form for magnetization damping

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The effect of thermal fluctuations on a thin film magnetoresistive element has been calculated. The technique involves adding to the basic spin dynamics a general form of interaction with a thermal bath. For a general anisotropic magnetic system the resulting equation can be written as a Langevin equation for a harmonic oscillator. Our approach predicts two times smaller noise power at low frequencies than the conventional stochastic Landau-Lifshitz-Gilbert equation. It is shown that equivalent results can be obtained by introducing a tensor phenomenological damping term to the gyromagnetic dynamics driven by a thermal fluctuating field.
Some minor changes with notations and comparison with Smith-Arnett result

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Materials Science, Statistical Mechanics

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http://salesiana.dossiersoluciones.com/handle/123456789/17550

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0103624
 http://arxiv.org/abs/cond-mat/0103624

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arXiv