Constituents of magnetic anisotropy and a screening of spin-orbit coupling in solids

Abstract

Using quantum mechanical perturbation theory (PT) we analyze how the energy of perturbation of different orders is renormalized in solids. We test the validity of PT analysis by considering a specific case of spin-orbit coupling as a perturbation. We further compare the relativistic energy and the magnetic anisotropy from the PT approach with direct density functional calculations in FePt, CoPt, FePd, MnAl, MnGa, FeNi, and tetragonally strained FeCo. In addition using decomposition of anisotropy into contributions from individual sites and different spin components we explain the microscopic origin of high anisotropy in FePt and CoPt magnets.

arXiv commentMaterials of this paper have been presented at the 58th Annual Magnetism and Magnetic Materials (MMM) Conference in Denver, Colorado in November 2013

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• Effects of alloying and strain on the magnetic properties of Fe${}_{16}$N${}_2$
• Mechanism of uniaxial magnetocrystalline anisotropy in transition metal alloys
• Multiscale nature of hysteretic phenomena: Application to CoPt-type magnets

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