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A Mossbauer investigation of amorphous Sm-Fe-B ribbons under applied field

Domenii publicaţii > Fizica + Tipuri publicaţii > Articol în revistã ştiinţificã

Autori: Le Breton JM, Ovidiu Crisan

Editorial: JOURNAL OF ALLOYS AND COMPOUNDS, 351 (1-2), p.59-64, 2003.

Rezumat:

Applied field Mossbauer spectrometry is used to investigate the magnetic structure in two amorphous Sm-Fe-B ribbons with measured compositions Sm7.2Fe72.8B20 and Sm12Fe68B20. The applied field dependence of the hyperfine field agrees with the ferromagnetic coupling between the Fe and Sm magnetic moments. For the Sm7.2Fe72.8B20 ribbon, the magnetic moments are aligned in the applied field direction for fields higher than 4 T. For the Sm12Fe68B20 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 Sm12Fe68B20 ribbon, as the related composition lies in the concentration range where the local order around iron atoms is strongly influenced by the samarium atoms.

Cuvinte cheie: rare earth compounds; transition metal compounds; amorphous materials; Mossbauer spectroscopy