Abstract
In this chapter, a brief historical overview of the itinerant electron magnetism is first presented. For later comparison with metallic magnetism, some typical magnetic properties of localized moment magnets are presented. It is known that these magnets are well described by the Heisenberg model. To see the effect of magnetic fluctuations, two approximate methods for the model are compared with each other. One is the well-known mean field approximation, and the other is based on the conservation of the local spin amplitudes. As an introduction to metallic magnetism, the temperature dependence and the effect of external magnetic field are treated based on the Stoner-Wohlfarth theory.
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Takahashi, Y. (2013). Introduction. In: Spin Fluctuation Theory of Itinerant Electron Magnetism. Springer Tracts in Modern Physics, vol 253. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-36666-6_1
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DOI: https://doi.org/10.1007/978-3-642-36666-6_1
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