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Chapter XV Theoretical Remarks on Ferromagnetism at Low Temperatures

Elsevier Science & Technology
DOI: 10.1016/s0079-6417(08)60090-6
  • Chemistry
  • Physics


Publisher Summary One may either have independent grains that are usually obtained by chemical means, or ferromagnetic grains that are dispersed in a non-magnetic phase, and which are obtained during segregation by cooling a homogeneous phase that is stable at high temperatures. There are only two extreme examples for which it is possible to give a clear and satisfactory picture of the magnetization process inside the hysteresis region. On one hand there is the case of a finely divided substance, the grains of which are so small that they contain only a single elementary Weiss domain, and which are sufficiently separated from each other, such that their interactions may be neglected. The other case is that of a solid substance which is sufficiently pure and homogeneous, such that the elementary domains are large and well-formed, and such that the walls that separate them are approximately plane and at a distance from each other that is large compared to their thickness.

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