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Strain Tuned Magnetic Properties of Epitaxial Cobalt Ferrite Thin Films

Published online by Cambridge University Press:  10 February 2011

G. Hu ,
J.H. Choi ,
C.B. Eom  and
Y. Suzuki
G. Hu
Affiliation:
Department of MS&E, Cornell University, Ithaca, NY 14853, gh47@cornell.edu
J.H. Choi
Affiliation:
Department of Mech. Engr. & Mater. Sci., Duke University, Durham, NC 22208
C.B. Eom
Affiliation:
Department of Mech. Engr. & Mater. Sci., Duke University, Durham, NC 22208
Y. Suzuki
Affiliation:
Department of MS&E, Cornell University, Ithaca, NY 14853, gh47@cornell.edu
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Abstract

Epitaxial cobalt ferrite thin films have been fabricated on bare MgO substrates and compared to those grown on CoCr2O4 buffered MgAl2O4. Various structural characterizations, including x-ray diffraction, Rutherford backscattering spectroscopy and transmission electron microscopy, demonstrate excellent crystallinity of the films. Films grown under tension exhibit magnetic properties dominated by the stress anisotropy. In (110) oriented films grown on CoCr2O4 buffered MgAl2O4, post deposition annealing switched the in-plane easy and hard directions completely while no such behavior is observed in cobalt ferrite films grown on MgO. The anomalous behaviors observed in as-grown films and films after annealing can be explained in terms of lattice distortion and cation redistribution.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 603: Symposium KK – Materials Issues for Tunable RF & Microwave Devices , 1999 , 201
Copyright
Copyright © Materials Research Society 2000

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