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

doi:10.1109/TMAG.2014.2327129

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 journal › Article › peer-review

5 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 language	English
Article number	6971508
Journal	IEEE Transactions on Magnetics
Volume	50
Issue number	11
DOIs	https://doi.org/10.1109/TMAG.2014.2327129
Publication status	Published - 2014 Nov 1

Keywords

Ferrite films
magnetic anisotropy
magnetostriction

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

Access to Document

10.1109/TMAG.2014.2327129

Cite this

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

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).",

keywords = "Ferrite films, magnetic anisotropy, magnetostriction",

author = "Hideto Yanagihara and Mineto Oka and Yuji Utsumi and Tomohiko Niizeki and Suzuki, {Kazuya Z.} and Inoue, {Jun Ichiro} and Eiji Kita",

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T1 - In-plane uniaxial anisotropy of cobalt ferrite films epitaxially grown on MgAl2O4 (110)

AU - Yanagihara, Hideto

AU - Oka, Mineto

AU - Utsumi, Yuji

AU - Niizeki, Tomohiko

AU - Suzuki, Kazuya Z.

AU - Inoue, Jun Ichiro

AU - Kita, Eiji

PY - 2014/11/1

Y1 - 2014/11/1

N2 - 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).

AB - 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).

KW - Ferrite films

KW - magnetic anisotropy

KW - magnetostriction

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