Magnetic properties and atomic ordering of BCC Heusler alloy Fe₂MnGa ribbons

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• 作者：Yuepeng Xin ; Yuexing Ma ; Hongzhi Luo ; ^{luo_hongzhi@163.com" class="auth_mail" title="E-mail the corresponding author} ; Fanbin Meng ; Heyan Liu
• 关键词：Heusler alloys ; Electronic structure ; Magnetic properties ; Anti-site disorder
• 刊名：Physica B: Physics of Condensed Matter
• 出版年：2016
• 出版时间：15 May 2016
• 年：2016
• 卷：489
• 期：Complete
• 页码：51-55
• 全文大小：815 K

文摘

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 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. L2₁ 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 μ_B, close to the experimental value.