The realization of ferro-ferrimagnetic transition and half-metallicity in half-Heusler CoMnGa alloy

We theoretically predicted that half-Heusler CoMnGa alloy to be half-metallic ferrimagnet at the equilibrium lattice parameter. With the lattice expansion, a local energy minimum occurs at a larger lattice parameter where CoMnGa alloy is in a metastable ferromagnetic state. However, a ferro-ferrimag...

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Bibliographic Details
Published in:Applied physics letters 2014-11, Vol.105 (21)
Main Authors: Wang, L. Y., Dai, X. F., Wang, X. T., Liu, X. F., Li, P. P., Cui, Y. T., Liu, E. K., Wang, W. H., Wu, G. H., Liu, G. D.
Format: Article
Language:English
Subjects:
Annealing
Applied physics
Ferrimagnets
Ferromagnetism
Heusler alloys
Magnetic transitions
Metallicity
Parameters
Temperature
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Summary:We theoretically predicted that half-Heusler CoMnGa alloy to be half-metallic ferrimagnet at the equilibrium lattice parameter. With the lattice expansion, a local energy minimum occurs at a larger lattice parameter where CoMnGa alloy is in a metastable ferromagnetic state. However, a ferro-ferrimagnetic transition (Fo-Fi-T) is not observed in experiment. We found the Co-Mn antisites can induce the Fo-Fi-T by adjusting the driving force of magnetic transition and the energy barrier. The antisites are sensitive to the preparation methods and annealing temperatures. The highly ordered CoMnGa is achieved by annealing at 1073 K. The Fo-Fi-T occurs in a sample annealed at 1083 K.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4902523