Abstract
Applied field Mössbauer spectrometry is used to investigate the magnetic structure in two amorphous Sm–Fe–B ribbons with measured compositions Sm 7.2Fe 72.8B 20 and Sm 12Fe 68B 20. The applied field dependence of the hyperfine field agrees with the ferromagnetic coupling between the Fe and Sm magnetic moments. For the Sm 7.2Fe 72.8B 20 ribbon, the magnetic moments are aligned in the applied field direction for fields higher than 4 T. For the Sm 12Fe 68B 20 ribbon, the magnetic moments are not completely aligned in the direction of the applied field for fields up to 6 T. This spin canting is attributed to the influence of the samarium anisotropy, which probably dominates in the Sm 12Fe 68B 20 ribbon, as the related composition lies in the concentration range where the local order around iron atoms is strongly influenced by the samarium atoms.
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