Abstract
A Mossbauer spectrometry study of bcc Fe-Co alloys was performed to measure the 57Fe hyperfine-field parameters from 77 to 900 K. The temperature dependence of the 57Fe hyperfine magnetic field in Fe-Co alloys was similar, although not identical, to that of 57Fe in pure Fe. These results are understood if the alignment of magnetic moments at Fe atoms is only slightly more temperature dependent than at Co atoms. This situation for Fe-Co is significantly different from that of Fe-Ni alloys, indicating that the interatomic exchange interactions in Fe-Co alloys are stronger than in Fe-Ni.
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