Atomic ordering, magnetic properties, and electronic structure of Mn2CoGa Heusler alloy

The magnetic properties and atomic arrangement of Mn2CoGa Heusler alloy were investigated experimentally and by theoretical calculations. The magnetic moment derived from spontaneous magnetization at 5 K was 2.06 μB/f.u. and was close to the integer number of the expected value from theoretical calc...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2019-02, Vol.31 (6), p.065801-065801
Main Authors: Umetsu, Rie Y, Tsujikawa, Masato, Saito, Kotaro, Ono, Kanta, Ishigaki, Toru, Kainuma, Ryosuke, Shirai, Masafumi
Format: Article
Language:English
Subjects:
atomic ordering
Curie temperature
half-metal-type ferromagnets
magnetic moment
order-disorder phase transition
powder neutron diffraction
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Summary:The magnetic properties and atomic arrangement of Mn2CoGa Heusler alloy were investigated experimentally and by theoretical calculations. The magnetic moment derived from spontaneous magnetization at 5 K was 2.06 μB/f.u. and was close to the integer number of the expected value from theoretical calculation and the Slater-Pauling rule predicted by Galanakis et al. The Curie temperature and L21-B2 order-disorder phase transition temperature were 741 and 1047 K, respectively. Powder neutron diffraction experiment results suggested that the atomic arrangement prefers an L21b-type structure rather than that of Hg2CuTi, being consistent with our previous results of high-angle annular dark-field-scanning transmission electron microscopic observations. The magnetic moments obtained were in good agreement with the theoretical values in the model of the L21b-type structure. The density of states obtained by the first-principles calculation combined with the coherent potential approximation in Mn2CoGa with the L21b-type crystal structure maintained the half-metallic character, even though disordering by Mn and Co atoms was introduced.
ISSN:0953-8984
1361-648X
DOI:10.1088/1361-648X/aaf54a