期刊
PHYSICA B-CONDENSED MATTER
卷 489, 期 -, 页码 51-55出版社
ELSEVIER
DOI: 10.1016/j.physb.2016.02.030
关键词
Heusler alloys; Electronic structure; Magnetic properties; Anti-site disorder
资金
- National Natural Science Foundation of China [11474343, 51371075]
- Foundation of Hebei Provincial Education Department [BJ2014012]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT13060]
The electronic structure, atomic disorder and magnetic properties of the Heusler alloy Fe2MnGa have been investigated experimentally and theoretically. BCC Fe2MnGa ribbon samples were prepared. Experimentally, a saturation magnetic moment (3.68 LIB at 5 K) much larger than the theoretical value (2.04 mu(B)) has been reported. First-principles calculations indicate that the difference is related to the Fe-Mn disorder between A, B sites, as can also be deduced from the XRD pattern. L2(1) type Fe2MnGa is a ferrimagnet with antiparallel Fe and Mn spin moments. However, when Fe-Mn disorder occurs, part of Mn moments will be parallel to Fe moments, and the Fe moments also clearly increase simultaneously. All this results in a total moment of 3.74 mu(B), close to the experimental value. (C) 2016 Elsevier B.V. All rights reserved.
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