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Transport properties of Fe60Al40 during the B2 to A2 structural phase transition

Sorokin, S.; Anwar, M. S.; Hlawacek, G.; Boucher, R.; Salgado Cabaco, J.; Potzger, K.; Lindner, J.; Faßbender, J.; Bali, R.


The variation of transport behaviour in a mesoscopic Fe60Al40 wire, initially possessing the ordered B2-phase structure, has been observed while inducing a phase transition to the disordered A2 structure. Gradual disordering was achieved using a highly focused beam of Ne+-ions. Both electrical resistance and anomalous Hall effect were measured in parallel with the local ion irradiation. Both the normal and Hall resistivity show a peak as a function of fluence. Moreover, the relationship between Hall resistivity and normal resistivity reconfirms the presence of two distinct regimes in the transition. Furthermore, field-dependence and temperature-dependence measurements were used to identify that it is necessary to consider the effect of scattering from magnetic clusters to understand these different regimes in transport properties.

Keywords: ion beams; magnetic materials; phase transitions; transport properties; ion microscope; magnetic clusters; ion irradiation

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