Magnetic properties, phase stability, electronic structure, and half-metallicity of L 21 -type Co2 (V1-x Mnx) Ga Heusler alloys

R. Y. Umetsu, K. Kobayashi, Asaya Fujita, R. Kainuma, K. Ishida, K. Fukamichi, A. Sakuma

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39 Citations (Scopus)

Abstract

Magnetic properties, phase stability, electronic structure, and spin polarization ratio of L 21 -type phase in Co2 (V1-x Mnx) Ga Heusler alloys have been investigated experimentally and theoretically. The experimental magnetic moments Ms at 4.2 K linearly increase with increasing x, in situ with the generalized Slater-Pauling rule. The experimental Curie temperature TCexpt. exhibits a maximum value of about 704 K at x=0.75. The latter behavior is comparable to the calculated Curie temperature TCcalc. from the theoretical effective exchange constant J0. Although the order-disorder transition temperature Tt L 21 B2 from the L 21 - to B2 -type phase linearly decreases with increasing x, it is relatively high enough in the entire concentration region. The high value of Tt L 21 B2 means that the L 21 -type phase can exist stably, which is very important for practical uses. The calculated density of states by the linear-muffitin orbital method with the atomic sphere approximation disclosed that the spin polarization ratio P of the alloy with x=0.75 is the highest in the present substituted alloys.

Original languageEnglish
Article number104422
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume77
Issue number10
DOIs
Publication statusPublished - 2008 Mar 13

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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