Nonlinear damping in spin systems: Ferromagnetic infinite range exchange interactions

T. Plefka

Physica A: Statistical Mechanics and its Applications, 1990, vol. 162, issue 3, 477-488

Abstract: To establish an appropriate form of the nonlinear, dynamical, effective field theory for strongly interacting spins a spin model with isotropic infinite-ranged exchange interaction driven by an external field and coupled to a bath is investigated. From a microscopic starting point the nonlinear equation of motion for the homogeneous magnetization is calculated. New nonlinear damping terms result from the spin-spin interaction in addition to the usual Landau-Lifshitz terms. An interpretation of the general results is presented in terms of an effective rotating field and some simplifications for special cases are worked out.

Date: 1990
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:162:y:1990:i:3:p:477-488

DOI: 10.1016/0378-4371(90)90429-V

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