Magnetic properties and atomic ordering of BCC Heusler alloy Fe2MnGa ribbons
2016
Abstract The electronic structure, atomic disorder and magnetic properties of the Heusler alloy Fe 2 MnGa have been investigated experimentally and theoretically. BCC Fe 2 MnGa ribbon samples were prepared. Experimentally, a saturation magnetic moment (3.68 μ B at 5 K) much larger than the theoretical value (2.04 μ 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 Fe 2 MnGa 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 μ B , close to the experimental value.
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