Fe2MnGe: A hexagonal Heusler analogue

JOURNAL OF ALLOYS AND COMPOUNDS

卷:771

Article

Keshavarz, S.^1,2  Naghibolashrafi, N.^2,3  Jamer, M. E.⁴  Vinson, K.³  Mazumdar, D.⁵  Dennis, C. L.⁶  Ratcliff, W., II⁴  Borchers, J. A.⁴  Gupta, A.^2,7,8  LeClair, P.^1,2 

[1] Univ Alabama, Dept Phys & Astron, Tuscaloosa, AL 35487 USA

[2] Univ Alabama, MINT Ctr, Tuscaloosa, AL 35487 USA

[3] Univ Alabama, Mat Sci Program, Tricampus, Tuscaloosa, AL 35487 USA

[4] NIST, Ctr Neutron Res, Gaithersburg, MD 20899 USA

[5] Southern Illinois Univ, Dept Phys, Carbondale, IL 62901 USA

[6] NIST, Mat Measurement Lab, Gaithersburg, MD 20899 USA

[7] Univ Alabama, Dept Chem, Tuscaloosa, AL 35405 USA

[8] Univ Alabama, Dept Chem & Biol Engn, Tuscaloosa, AL 35405 USA

关键词: Heusler;    Magnetic;    Neutron diffraction;   

DOI  :  10.1016/j.jallcom.2018.07.298

来源: Elsevier

【 摘 要 】

We synthesized bulk polycrystalline samples of Fe2MnGe using arc-melting and vacuum annealing. Our experimental investigations revealed that Fe2MnGe crystallizes in a hexagonal DO19 phase at room temperature, in analogy with its parent compound Fe3Ge. We find a large saturation magnetization, even larger than that predicted for the tetragonal phase, of approximately 5 mu(B)/f.u. at T = 5 K, with a Curie temperature of T-c similar to 505 K. The large moment and magnetocrystalline anisotropy, along with the possibility of half-metallicity presents Fe2MnGe as a strong candidate for spin-transfer-torque RAM and other spintronic applications. We do not find evidence for the cubic or tetragonal phases predicted by first-principles theory during these investigations. However, our neutron diffraction investigations were suggestive of a low temperature structural transformation. (C) 2018 The Authors. Published by Elsevier B.V.

【 授权许可】

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