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MA: Fachverband Magnetismus
MA 62: Disodered Magnetic Materials
MA 62.3: Vortrag
Freitag, 20. März 2020, 10:00–10:15, HSZ 401
Large Hall angle of the disordered B2 Fe60Al40 alloy — •Václav Drchal1, Josef Kudrnovský1, František Máca1, Ilja Turek2, and Sergii Khmelevskyi3 — 1Inst. of Physics, Czech Acad. Sci., Praha, Czech Republic — 2Inst. of Physics of Materials, Czech Acad. Sci., Brno, Czech Republic — 3Center for Computational Materials Science, Vienna University of Technology, Austria
The electronic and transport properties of the ordered B2 Fe60Al40 alloy which undergoes a continuous transition into disordered A2 Fe60Al40 phase are studied from first principles. Variation of the alloy disorder due to Fe antisites on Al sublattice is characterized by the partial long-range order. This is the simplest model of gradual disordering of the ordered phase due to the ion irradiation. The physical properties are strongly influenced by varying local environment of Fe atoms on both sublattices. This leads to the transition between a very low moment in the ordered phase to a high moment at large disorder. Similar behavior is found also for anomalous Hall conductivity and anomalous Hall angle. The disordered phase has a large Hall angle as contrasted with a negligible Hall angle for well ordered samples, which is in agreement with recent experiment.