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Structural and Magnetic Properties, and Electronic Structures of Fe-Mn-Ga Alloys
Y. V. Kudryavtsev,N. V. Uvarov,V. N. Iermolenko,J. Dubowik,J. Y Rhee,유영준,이영백 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.10
We report the structural and the magnetic investigations on bulk Fe-Mn-Ga alloy and the films with a stoichiometry of 1:1:1. Both the alloy and the films reveal an unstable crystallographic structure. While the bulk alloy appears to possess a mixed ferromagnetic hexagonal structure with the presence of a (Mn/Fe)9Ga5 ζ-phase, the films have ferromagnetic cubic phases in various types of structural ordering that depend on the deposition and the annealing conditions. Exchange bias and enhanced coercivity occur simultaneously in B2-type ordered FeMnGa films, revealing an exchange coupling between coexisting antiferromagnetic and ferromagnetic phases. The experimental results are compared with the results of the first-principle calculations.