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Interplay between mesoscopic and microscopic fluctuations in ferromagnets

Author

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  • Yukalov, V.I.

Abstract

A model of a ferromagnet is considered, in which there arise mesoscopic fluctuations of paramagnetic phase. The presence of these fluctuations diminishes the magnetization of the ferromagnet, softens the spin-wave spectrum, increases the spin-wave attenuation, shortens the magnon free path, lowers the critical point, and can change the order of phase transition. A special attention is paid to the interplay between these mesoscopic paramagnetic fluctuations and microscopic fluctuations due to magnons. One of the main results of this interplay is an essential extension of the region of parameters where the ferromagnet–paramagnet phase transition is of first order.

Suggested Citation

  • Yukalov, V.I., 1999. "Interplay between mesoscopic and microscopic fluctuations in ferromagnets," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 262(3), pages 467-482.
    • Handle: RePEc:eee:phsmap:v:262:y:1999:i:3:p:467-482
    DOI: 10.1016/S0378-4371(98)00426-9
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