Irreversible thermodynamics of non-uniform insulating ferromagnets

Two types of damping are commonly applied to describe ferromagnets at the phenomenological level: one by Landau and Lifshitz, and the other by Gilbert. This work successively applies the methods of irreversible thermodynamics to insulators, insulating paramagnets, and uniform insulating ferromagnets...

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Published in:Journal of magnetism and magnetic materials 2008-11, Vol.320 (21), p.2622-2628
Main Authors: Saslow, Wayne M., Rivkin, Kirill
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
General theory and models of magnetic ordering
Gilbert damping
Landau–Lifshitz damping
Magnetic properties and materials
Non-uniform insulating ferromagnet
Physics
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description Two types of damping are commonly applied to describe ferromagnets at the phenomenological level: one by Landau and Lifshitz, and the other by Gilbert. This work successively applies the methods of irreversible thermodynamics to insulators, insulating paramagnets, and uniform insulating ferromagnets, in the last case uniquely obtaining Landau–Lifshitz damping. These methods are then applied to non-uniform insulating ferromagnets, for which new, non-current-related, spin fluxes and spin torques appear. These may be relevant to the dynamics of magnets in confined geometries, where boundary conditions impose complex non-trivial textures. Study of systems with very large damping might help distinguish between the two proposed forms of damping.
doi_str_mv 10.1016/j.jmmm.2008.05.027
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subjects Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
General theory and models of magnetic ordering
Gilbert damping
Landau–Lifshitz damping
Magnetic properties and materials
Non-uniform insulating ferromagnet
Physics
title Irreversible thermodynamics of non-uniform insulating ferromagnets
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