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Preparation and characteristics of 90° rotated biepitaxial Fe3O4 thin films

Published online by Cambridge University Press:  31 January 2011

Hiroshi Matsuda ,
Hiroshi Sakakima ,
Hideaki Adachi ,
Akihiro Odagawa  and
Kentaro Setsune
Hiroshi Matsuda
Affiliation:
Graduate School of Materials Science, Nara Institute of Science and Technology, 8916–5 Takayama-cho, Ikoma, Nara 630–0101, Japan
Hiroshi Sakakima
Affiliation:
Graduate School of Materials Science, Nara Institute of Science and Technology, 8916–5 Takayama-cho, Ikoma, Nara 630–0101, Japan
Hideaki Adachi
Affiliation:
Advanced Technology Research Laboratories, Matsushita Electric Ind. Co., Ltd., 3–4 Hikaridai, Seika, Kyoto 619–0237, Japan
Akihiro Odagawa
Affiliation:
Advanced Technology Research Laboratories, Matsushita Electric Ind. Co., Ltd., 3–4 Hikaridai, Seika, Kyoto 619–0237, Japan
Kentaro Setsune
Affiliation:
Advanced Technology Research Laboratories, Matsushita Electric Ind. Co., Ltd., 3–4 Hikaridai, Seika, Kyoto 619–0237, Japan
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Abstract

In-plane 90° rotated biepitaxial Fe3O4 thin films have been successfully prepared onto MgO (110) substrates using a CeO2 seed layer and their microstructure, electric, and magnetic properties were investigated. From the x-ray φ-scan measurements, the in-plane epitaxial relations were determined as 〈110〉Fe3O4//〈110〉MgO and 〈001〉Fe3O4//〈001〉MgO for the no-seeded Fe3O4 layer, and 〈001〉Fe3O4//〈110〉MgO and 〈110〉Fe3O4//〈001〉MgO for the CeO2 (110) seeded Fe3O4 layer. The CeO2 seed layer was found to rotate the upper Fe3O4 lattice at 90° upon normal axis to the layer against the no-seeded Fe3O4. The transmission electron microscopy and electron diffraction analyses revealed that the transition region of the biepitaxial Fe3O4 boundary between CeO2-seeded and no-seeded portions consisted of columnarlike polycrystalline grains. The Fe 3O4 films exhibited single-crystallinelike electric and magnetic properties, however, substantial spin-dependent-tunneling magnetoresistance across the 90° grain boundary was not observed even in the antiparallel situation for each Fe3O4 portion.

Type
Articles
Information
Journal of Materials Research , Volume 17 , Issue 8 , August 2002 , pp. 1985 - 1991
Copyright
Copyright © Materials Research Society 2002

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