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Preparation and characteristics of 90° rotated biepitaxial Fe3O4 thin films

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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.

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Authors and Affiliations

  1. Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama-cho, Ikoma, Nara, 630-0101, Japan

    Hiroshi Matsuda & Hiroshi Sakakima

  2. Advanced Technology Research Laboratories, Matsushita Electric Ind. Co., Ltd., 3-4 Hikaridai, Seika, Kyoto, 619-0237, Japan

    Hideaki Adachi, Akihiro Odagawa & Kentaro Setsune

Authors
  1. Hiroshi Matsuda
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  2. Hiroshi Sakakima
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  3. Hideaki Adachi
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  4. Akihiro Odagawa
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  5. Kentaro Setsune
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Matsuda, H., Sakakima, H., Adachi, H. et al. Preparation and characteristics of 90° rotated biepitaxial Fe3O4 thin films. Journal of Materials Research 17, 1985–1991 (2002). https://doi.org/10.1557/JMR.2002.0294

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  • DOI: https://doi.org/10.1557/JMR.2002.0294

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