Anisotropy in layered half-metallic Heusler alloy superlattices

Javad G Azadani, Kamaram Munira, Jonathon Romero, Jianhua Ma, Chockalingam Sivakumar, Avik W. Ghosh, and William H Butler , Journal of Apllied Physics , 119 :043904 (2016).
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We show that when two Heusler alloys are layered in the [001], [110], or [111] directions for various thicknesses to form a superlattice, the Slater-Pauling rule may still be satisfied and the resulting superlattice is often half-metallic with gaps comparable to or larger than those of its constituents. In addition, uniaxial magnetocrystalline anisotropy is induced because of the differences in the electronic structure of the two Heuslers in the superlattice. Various full-full, full-half, and half-half Heusler superlattices are studied, and potential half-metallic superlattices with perpendicular magnetocrystalline anisotropy are identified.