Abstract
We have carried out a systematic investigation of the structure and magnetism of Fe75-xCr25Gax (11 < x < 33) and Fe50Cr50-yGay (0 < y < 33) series of compounds. The results show that the parent Fe50Cr25Ga25 phase has a higher tolerance for Ga replacing Cr than replacing Fe atoms. An abrupt decrease of the Curie temperature and magnetization was observed at the composition of Fe50Cr25Ga25. This can be explained by anti-site occupation and transition of magnetic structure in these series. The induced structure is energetically favorable according to first-principles calculations. This work clarifies our understanding of the interdependence between the atomic configurations and magnetism in Fe-based Heusler compounds, and provides a method to deduce the atomic configurations through the evolution of magnetism.
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