Kyushu Institute of Technology Academic Repository
Kyutacarは九州工業大学で生産された研究成果を オープンアクセスで提供する機関リポジトリシステムです。 Kyutacar is open-access repository of research by members of the Kyushu Institute of Technology.
Department of Materials Science, Kyushu Institute of Technology
Department of Materials Science, Kyushu Institute of Technology
National Institute for Materials Science
Institute of Scientific and Industrial Research, Osaka University
National Institute for Materials Science
Department of Basic Science, Kyushu Institute of Technology
Department of Basic Science, Kyushu Institute of Technology
抄録
Epitaxial indium−tin oxide (ITO) thin films were fabricated on a yttria-stabilized zirconia (YSZ) substrate by pulsed-laser deposition using magnetite (Fe3O4) nanoparticle dispersed ITO powders as a target. Magnetoresistance of the film at a field of 1 T was 39% at 45 K, and it stayed at 3% above 225 K. The film demonstrated cooling hysteresis in the temperature dependence of direct-current magnetization. Transmission electron microscopy revealed that phase-separated Fe3O4 nanocrystals with widths of ≈40−150 nm and heights of ≈10−25 nm precipitated and grew epitaxially on the substrate in the film. Both the Fe3O4(111) and ITO(001) planes were parallel to the YSZ(001) plane. The Fe3O4(11−2) and -(1−10) planes were parallel to the ITO(100) and -(010) planes, respectively, and the planes connected smoothly at the grain boundary. The contour map of the electron density for the Fe3O4(111) plane by the first-principles electronic structure computation was similar to that for the ITO(001) plane. The [111]-oriented Fe3O4 nanocrystals played the role of spin aligner for charge carriers of the epitaxial ITO film.
Magnetoresistance and Microstructure of Magnetite Nanocrystals Dispersed in Indium−Tin Oxide Thin Films
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