Atomic ordering, magnetic properties, and electronic structure of Mn 2 CoGa Heusler alloy

Rie Y. Umetsu, Masato Tsujikawa, Kotaro Saito, Kanta Ono, Toru Ishigaki, Ryosuke Kainuma, Masafumi Shirai

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8 Citations (Scopus)

Abstract

The magnetic properties and atomic arrangement of Mn 2 CoGa Heusler alloy were investigated experimentally and by theoretical calculations. The magnetic moment derived from spontaneous magnetization at 5 K was 2.06 μ B /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 L2 1 -B2 order-disorder phase transition temperature were 741 and 1047 K, respectively. Powder neutron diffraction experiment results suggested that the atomic arrangement prefers an L2 1b -type structure rather than that of Hg 2 CuTi, 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 L2 1b -type structure. The density of states obtained by the first-principles calculation combined with the coherent potential approximation in Mn 2 CoGa with the L2 1b -type crystal structure maintained the half-metallic character, even though disordering by Mn and Co atoms was introduced.

Original languageEnglish
Article number065801
JournalJournal of Physics Condensed Matter
Volume31
Issue number6
DOIs
Publication statusPublished - 2019 Feb 13

Keywords

  • Curie temperature
  • atomic ordering
  • half-metal-type ferromagnets
  • magnetic moment
  • order-disorder phase transition
  • powder neutron diffraction

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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