Abstract
A model based on the idea of localized magnetic moments is presented which allows to calculate the local magnetic moment expectation values of FeNi alloys. The only parameters of the model are the exchange integralsJ FeFe,J FeNi,J NiNi. By assuming a “mixed” exchange interaction the concentration dependence of the exchange integralsJ FeFe andJ FeNi is calculated. The model allows the iron magnetic moments to orient parallel or antiparallel to the magnetization axis, depending on the local environment. It explains the magnetic abnormalies of FeNi Invar alloys as for example the concentration dependence of the mean magnetic moment and the Curie temperatures as well as the characteristic “flat” courves of the spontaneous magnetization.
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This paper is part of a thesis submitted in June 1982
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Müller, J.B., Hesse, J. A model for magnetic abnormalies of FeNi Invar alloys. Z. Physik B - Condensed Matter 54, 35–42 (1983). https://doi.org/10.1007/BF01507947
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DOI: https://doi.org/10.1007/BF01507947