Abstract
A theoretical description of the magnetic properties in disordered alloys Fe-M (M=A1, Si, Sn, Ga) on the basis of a two-band model of the Hubbard type is presented. It is shown that at T=0 the local magnetic moment is determined by the number of metalloid atoms in the nearest environment and weakly depends on the concentration, which allows to use the Jaccarino-Walker model for the description of the experimental results. The thermodynamical Stoner excitations have essential effect at high concentration of the metalloid. The spin density fluctuations should be taken into account in a calculation of the concentration dependence of the Curie temperature at low concentration. So, at all concentrations, the itinerant character of the magnetism of these alloys does not allow to use localized models.
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Arzhnikov, A.K., Dobysheva, L.V. (1998). The Formation of the Magnetic Properties in Disordered Binary Alloys of Metal-Metalloid Type. In: Wagner, D., Brauneck, W., Solontsov, A. (eds) Itinerant Electron Magnetism: Fluctuation Effects. NATO Science Series, vol 55. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-5080-4_24
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DOI: https://doi.org/10.1007/978-94-011-5080-4_24
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