Atomic ordering, magnetic properties, and electronic structure of Mn <sub>2</sub> CoGa Heusler alloy
Abstrak
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 L 2 1 - B 2 order–disorder phase transition temperature were 741 and 1047 K, respectively. Powder neutron diffraction experiment results suggested that the atomic arrangement prefers an L 2 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 L 2 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 L 2 1b -type crystal structure maintained the half-metallic character, even though disordering by Mn and Co atoms was introduced.
Penulis (7)
Rie Y Umetsu
Masato Tsujikawa
Kotaro Saito
Kanta Ono
Toru Ishigaki
Ryosuke Kainuma
Masafumi Shirai
Akses Cepat
- Tahun Terbit
- 2018
- Bahasa
- en
- Total Sitasi
- 14×
- Sumber Database
- CrossRef
- DOI
- 10.1088/1361-648x/aaf54a
- Akses
- Open Access ✓