Theory of Thermal Remagnetization of Permanent Magnets

Details Theory of Thermal Remagnetization of Permanent Magnets Theory of Thermal Remagnetization of Permanent Magnets

2001-02-05

arxiv.org/abs/cond-mat/0102056v1

Journal of Magnetism and Magnetic Materials 232 (2001) 231-243

Physics

Condensed Matter

Materials Science

28 pages, 9 figures, Latex2e, accepted for publication in JMMM

Scientific paper

10.1016/S0304-8853(01)00150-0

A self-consistent mean-field theory explaining the thermal remagnetization (TR) of polycrystalline permanent magnets is given. The influence of the environment of a grain is treated by an inclusion approximation, relating the field inside the grain to the local field outside by means of an internal demagnetization factor $n$. For the switching fields and the fluctuations of the local fields around the mean field Gaussian distributions of widths $\sigmas$ and $\sigmaf$ resp. are assumed. The isothermal hysteresis curve, the recoil curves, and the TR in dependence on the model parameters $n$, $\sigmas$, and $\sigmaf$ are calculated. Furthermore, the influence of the initial temperature and the strong dependence of the TR on the demagnetization factor of the sample are studied, and it is shown that for reasonable parameter sets TR effects up to 100 % are possible. The theoretical results correspond well with the experimental situation.

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