Magnetic anisotropy of epitaxial cobalt ferrite thin films

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:191

Article

Suzuki, Y ; Hu, G ; van Dover, RB ; Cava, RJ

关键词: anisotropy magnetic;    epitaxial thin films;    cobalt ferrite;   

DOI  :  10.1016/S0304-8853(98)00364-3

来源: Elsevier

【 摘 要 】

We have fabricated epitaxial single crystalline cobalt ferrite (CoFe2O4) thin films on CoCr2O4 buffered SrTiO3 and MgAl2O4 substrates. Structural characterization by X-ray diffraction, Rutherford backscattering spectroscopy and atomic force microscopy indicates excellent crystallinity. Magnetic anisotropy measurements in the in-plane and perpendicular directions as a function of film thickness provide strong evidence for the dominant role of strain in the magnetic anisotropy. Cobalt ferrite (1 0 0) films grown under compression have an easy [0 0 1] and hard [0 1 1] direction in the plane and [1 0 0] direction out of the plane of the him. Cobalt ferrite (1 1 0) films grown under compression give rise to an easy [0 0 1] and a hard [1 (1) over bar 0] directions in the plane of the film and a hard axis perpendicular to the film. Films grown under tension give rise to an easy axis perpendicular to the film. These observations are explained using magneto-elastic theory. (C) 1999 Elsevier Science B.V. All rights reserved.

【 授权许可】

Free