Large anisotropy of spin polarization in Heusler alloy Ni 2 MnGa induced by martensitic transformation

Zhiyong Zhu, H. W. Zhang, S. F. Xu, J. L. Chen, Z. X. Cao, G. H. Wu

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    1 Scopus citations

    Abstract

    Spin polarization both in the cubic austenitic and tetragonal martensitic phases of the Ni2 MnGa alloy has been investigated using first-principles calculations combined with classical Bloch-Boltzmann transport theory. It is shown that the degree of spin polarization, while decreasing from 42% in the 〈001〉 directions of the austenitic phase to 30% in the [100] direction of the martensitic phase, rises to 75% in the [001] direction of the martensitic phase, resulting from a preferential reconstruction of the spin-down Fermi surfaces upon martensitic transformation. With this finding, various recent intriguing electrical measurements upon Ni2 MnGa across the martensitic transformation can find an explanation. This also opens a way of searching for giant magnetoresistance materials.

    Original languageEnglish (US)
    Article number093704
    JournalJournal of Applied Physics
    Volume103
    Issue number9
    DOIs
    StatePublished - May 26 2008

    ASJC Scopus subject areas

    • Physics and Astronomy(all)

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