Extraordinarily large perpendicular magnetic anisotropy in epitaxially strained cobalt-ferrite CoxFe3-xO4(001) (x=0.75, 1.0) thin films

被引：89

作者：

Niizeki, Tomohiko ^{[1
]}

Utsumi, Yuji ^{[1
]}

Aoyama, Ryohei ^{[1
]}

Yanagihara, Hideto ^{[1
]}

Inoue, Jun-ichiro ^{[1
]}

Yamasaki, Yuichi ^{[2
]}

Nakao, Hironori ^{[2
]}

Koike, Kazuyuki ^{[3
]}

Kita, Eiji ^{[1
]}

机构：

[1] Univ Tsukuba, Inst Appl Phys, Tsukuba, Ibaraki 3058573, Japan

[2] High Energy Accelerator Res Org, Inst Mat Struct Sci, Photon Factory & Condensed Matter Res Ctr, Tsukuba, Ibaraki 3050801, Japan

[3] Hokkaido Univ, Div Phys, Grad Sch Sci, Kita Ku, Sapporo, Hokkaido, Japan

来源：

APPLIED PHYSICS LETTERS | 2013年 / 103卷 / 16期

关键词：

COFE2O4; SPINEL; ORIGIN;

D O I：

10.1063/1.4824761

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Perpendicular magnetic anisotropy (PMA) of cobalt-ferrite CoxFe(3)-xO(4) (x 0.75 and 1.0) epitaxial thin films grown on MgO (001) by a reactive magnetron sputtering technique was investigated. The saturation magnetization was found to be 430 emu/cm 3 for x 0.75, which is comparable to that of bulk CoFe2O4 (425 emu/cm(3)). Torque measurements afforded PMA constants of Keff u 9: 0Merg= cm(3) dKu 10: 0Merg= cm(3) and Keff u 9: 7Merg= cm(3) for x 0.75 and 1.0, respectively. The value of Keff u extrapolated using Miyajima's plot was as high as 14.7 Merg/cm(3) for x 1.0. The in-plane four-fold magnetic anisotropy was evaluated to be 1.6 Merg/cm 3 for x 0.75. X-ray diffraction measurement revealed our films to be pseudomorphically strained on MgO (001) with a Poisson ratio of 0.4, leading to a considerable in-plane tensile strain by which the extraordinarily large PMA could be accounted for. (C) 2013 AIP Publishing LLC.

引用

页数：5

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