Mechanism of uniaxial magnetocrystalline anisotropy in transition metal alloys

Yohei Kota, Akimasa Sakuma

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

Magnetocrystalline anisotropy in transition metal alloys (FePt, CoPt, FePd, MnAl, MnGa, and FeCo) was studied using first-principles calculations to elucidate its specific mechanism. The tight-binding linear muffin-tin orbital method in the local spin-density approximation was employed to calculate the electronic structure of each compound, and the anisotropy energy was evaluated using the magnetic force theorem and the second-order perturbation theory in terms of spin-orbit interactions. We systematically describe the mechanism of uniaxial magnetocrystalline anisotropy in real materials and present the conditions under which the anisotropy energy can be increased. The large magnetocrystalline anisotropy energy in FePt and CoPt arises from the strong spin-orbit interaction of Pt. In contrast, even though the spin-orbit interaction in MnAl, MnGa, and FeCo is weak, the anisotropy energies of these compounds are comparable to that of FePd. We found that MnAl, MnGa, and FeCo have an electronic structure that is efficient in inducing the magnetocrystalline anisotropy in terms of the selection rule of spin-orbit interaction.

Original languageEnglish
Article number034715
Journaljournal of the physical society of japan
Volume83
Issue number3
DOIs
Publication statusPublished - 2014 Mar 15

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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