Electron theory of perpendicular magnetic anisotropy of Co-ferrite thin films

Jun Ichiro Inoue; Tomohiko Niizeki; Hideto Yanagihara; Hiroyoshi Itoh; Eiji Kita

doi:10.1063/1.4866279

Electron theory of perpendicular magnetic anisotropy of Co-ferrite thin films

Jun Ichiro Inoue, Tomohiko Niizeki, Hideto Yanagihara, Hiroyoshi Itoh, Eiji Kita

Research output: Contribution to journal › Article › peer-review

12 Citations (Scopus)

Abstract

We develop an electron theory for the t_2g electrons of Co ²⁺ ions to clarify the perpendicular magnetic anisotropy (PMA) mechanism of Co-ferrite thin films by considering the spin-orbit interaction (SOI) and crystal-field (CF) potentials induced by the local symmetry around the Co ions and the global tetragonal symmetry of the film. Uniaxial and in-plane MA constants K_u and K₁ at 0 K, respectively, are calculated for various values of SOI and CF. We show that reasonable parameter values explain the observed PMA and that the orbital moment for the in-plane magnetization reduces to nearly half of that of the out-of-plane magnetization.

Original language	English
Article number	027111
Journal	AIP Advances
Volume	4
Issue number	2
DOIs	https://doi.org/10.1063/1.4866279
Publication status	Published - 2014 Feb 1

ASJC Scopus subject areas

Physics and Astronomy(all)

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AU - Inoue, Jun Ichiro

AU - Niizeki, Tomohiko

AU - Yanagihara, Hideto

AU - Itoh, Hiroyoshi

AU - Kita, Eiji

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N2 - We develop an electron theory for the t2g electrons of Co 2+ ions to clarify the perpendicular magnetic anisotropy (PMA) mechanism of Co-ferrite thin films by considering the spin-orbit interaction (SOI) and crystal-field (CF) potentials induced by the local symmetry around the Co ions and the global tetragonal symmetry of the film. Uniaxial and in-plane MA constants Ku and K1 at 0 K, respectively, are calculated for various values of SOI and CF. We show that reasonable parameter values explain the observed PMA and that the orbital moment for the in-plane magnetization reduces to nearly half of that of the out-of-plane magnetization.

AB - We develop an electron theory for the t2g electrons of Co 2+ ions to clarify the perpendicular magnetic anisotropy (PMA) mechanism of Co-ferrite thin films by considering the spin-orbit interaction (SOI) and crystal-field (CF) potentials induced by the local symmetry around the Co ions and the global tetragonal symmetry of the film. Uniaxial and in-plane MA constants Ku and K1 at 0 K, respectively, are calculated for various values of SOI and CF. We show that reasonable parameter values explain the observed PMA and that the orbital moment for the in-plane magnetization reduces to nearly half of that of the out-of-plane magnetization.

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Electron theory of perpendicular magnetic anisotropy of Co-ferrite thin films

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