In-plane uniaxial anisotropy of cobalt ferrite films epitaxially grown on MgAl2O4 (110)

Hideto Yanagihara, Mineto Oka, Yuji Utsumi, Tomohiko Niizeki, Kazuya Z. Suzuki, Jun Ichiro Inoue, Eiji Kita

    Research output: Contribution to journalArticlepeer-review

    4 Citations (Scopus)

    Abstract

    We have investigated the magnetic properties of cobalt ferrite films epitaxially grown on MgAl2O4 (110) substrates. The unit cell of the cobalt ferrite film on the substrate with twofold surface symmetry is tetragonally distorted with c/a < 1, and the film exhibits uniaxial magnetic anisotropy parallel to the in-plane [001] orientation, which is similar to what is observed for films grown on MgO (001). The magnetic easy axis is parallel to the in-plane [001] direction and the magnetic hard axis is parallel to the out-of-plane [110] direction. Careful measurement of the magnetic torque indicates that the anisotropy energy can be described by a combination of uniaxial, fourfold, and demagnetization terms. The uniaxial term is comparable with that obtained for cobalt-ferrite films epitaxially grown on MgO (001).

    Original languageEnglish
    Article number6971508
    JournalIEEE Transactions on Magnetics
    Volume50
    Issue number11
    DOIs
    Publication statusPublished - 2014 Nov 1

    Keywords

    • Ferrite films
    • magnetic anisotropy
    • magnetostriction

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Electrical and Electronic Engineering

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