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Dependence of the magnetization relaxation time of single-domain ferromagnetic particles on damping in the Brown model

  • Magnetism and Ferroelectricity
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Abstract

Analytical expressions for the magnetization relaxation time τ of single-domain ferromagnetic particles with cubic or uniaxial anisotropy in a static transverse magnetic field are derived. The derivation is based on calculating the escape rate of a Brownian particle from a potential well; this technique is applicable at any damping and is generalized to the case of magnetic relaxation of superparamagnetic particles. The validity of the expressions obtained for τ is checked against a numerical solution of the Landau-Lifshitz-Gilbert equation over the whole range of damping (very low, intermediate, and high damping and the crossover region between low and intermediate damping).

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Authors and Affiliations

  1. Laboratoire Mathématiques et Physique pour les Systémes, Université de Perpignan, Perpignan Cedex, 66860, France

    Yu. P. Kalmykov

  2. Department of Electronic and Electrical Engineering, Trinity College, Dublin 2, Ireland

    W. T. Coffey

  3. Institute of Radio Engineering and Electronics, Russian Academy of Science, pl. Vvedenskogo 1, Fryazino, Moscow oblast, 141190, Russia

    S. V. Titov

Authors
  1. Yu. P. Kalmykov
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  2. W. T. Coffey
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  3. S. V. Titov
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__________

Translated from Fizika Tverdogo Tela, Vol. 47, No. 2, 2005, pp. 260–267.

Original Russian Text Copyright © 2005 by Kalmykov, Coffey, Titov.

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Kalmykov, Y.P., Coffey, W.T. & Titov, S.V. Dependence of the magnetization relaxation time of single-domain ferromagnetic particles on damping in the Brown model. Phys. Solid State 47, 272–280 (2005). https://doi.org/10.1134/1.1866406

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  • DOI: https://doi.org/10.1134/1.1866406

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