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Non-Linear Local Environment Effect in Ni3Fe Observed by Mössbauer Effect of Fe57

Masaru Kanashiro, Nobuhiko Kunitomi

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Abstract

In order to study the local environment effect, measurements of the Mössbauer effect of Fe 57 were made for Ni 79.5 Fe 20.5 , Ni 75.4 Fe 24.6 and Ni 69.7 Fe 30.3 alloys with various degrees of long range order. We have analysed the Mössbauer pattern with 7 or 8 configurations without any assumption of the functional relation between the hyperfine field and the number of Fe atoms in the nearest neighbor shell and determined the value of the hyperfine field for each environment from which the values of the magnetic moment on Fe atoms could be deduced in a self-consistent way. The results show that the variations of the hyperfine field and the magnetic moment are not linear, especially for highly ordered alloys. This behavior is discussed in terms of the cluster CPA theory.

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What this paper is about

In order to study the local environment effect, measurements of the Mössbauer effect of Fe 57 were made for Ni 79.5 Fe 20.5 , Ni 75.4 Fe 24.6 and Ni 69.7 Fe 30.3 alloys with various degrees of long range order. We have analysed the Mössbauer pattern with 7 or 8 configurations without any assumption of the functional relation between the hyperfine field and the number of Fe atoms in the nearest neighbor shell and determined the value of the hyperfine field for each environment from which the values of the magnetic moment on Fe atoms could be deduced in a self-consistent way. The results show that the variations of the hyperfine field and the magnetic moment are not linear, especially for highly ordered alloys. This behavior is discussed in terms of the cluster CPA theory.

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Available abstract

In order to study the local environment effect, measurements of the Mössbauer effect of Fe 57 were made for Ni 79.5 Fe 20.5 , Ni 75.4 Fe 24.6 and Ni 69.7 Fe 30.3 alloys with various degrees of long range order. We have analysed the Mössbauer pattern with 7 or 8 configurations without any assumption of the functional relation between the hyperfine field and the number of Fe atoms in the nearest neighbor shell and determined the value of the hyperfine field for each environment from which the values of the magnetic moment on Fe atoms could be deduced in a self-consistent way. The results show that the variations of the hyperfine field and the magnetic moment are not linear, especially for highly ordered alloys. This behavior is discussed in terms of the cluster CPA theory.

Key concepts: Hyperfine structure, Magnetic moment, Mössbauer effect, Materials science, Mössbauer spectroscopy, Cluster (spacecraft), Condensed matter physics, Field (mathematics)

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Non-Linear Local Environment Effect in Ni3Fe Observed by Mössbauer Effect of Fe57 — Research Paper | ScholarLens