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  • Title: In-plane uniaxial magnetic anisotropy in (Ga, Mn)As due to local lattice distortions around Mn²⁺ ions.
    Author: Subramanian H, Han JE.
    Journal: J Phys Condens Matter; 2013 May 22; 25(20):206005. PubMed ID: 23615156.
    Abstract:
    We theoretically investigate the interplay between local lattice distortions around the Mn(2+) impurity ion and its magnetization, mediated through spin-orbit coupling of holes. We show that the tetrahedral symmetry around the Mn(2+) ion is spontaneously broken and that local Jahn-Teller distortions coupled with growth strain result in uniaxial magnetic anisotropy. We also account for the experimentally observed in-plane uniaxial magnetic anisotropy rotation due to variation of hole density. According to this model, lack of inversion and top-down symmetries of (Ga, Mn)As layers lead to in-plane biaxial symmetry breaking in the presence of Jahn-Teller distortions.
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