Study of the structure influence on the magnetism of Fe70Al30-xSix alloys
1 Dpt. Electricity and Electronics, Basque Country University (UPV/EHU), 48940 Leioa, Spain
2 Dpt. Applied Physics I, Basque Country University (UPV/EHU), 91944 Vitoria, Spain
Published online: 3 July 2014
The influence of the different structures on the evolution of the magnetism in the order-disorder transition produced by mechanical milling in the intermetallic Fe70Al30-xSix alloys has been systematically studied by means of XRD measurements, Mössbauer spectroscopy and magnetic measurements. These techniques show that there are two different stages in the evolution of the magnetism during the order-disorder transition and both stages are related to the presence of ordered B2 in annealed alloys. In a first stage the magnetization of the alloys decreases and this decrease corresponds to the presence of B2 structure and the disordering of the D03 structure. In the second stage the magnetization increases corresponding to the disordering of the B2 structure. Therefore, the increase of the magnetization is related to the disordering of B2 structure, but not to the disordering of D03 structure. Besides, when plotting the normalized variation of magnetization produced by the disorder versus the normalized variation of lattice parameter we observe a linear relationship, showing that lattice parameter and magnetic properties are also related.
© Owned by the authors, published by EDP Sciences, 2014
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