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Magnetoresistance Intensification of Fe3O4/BaTiO3 Nanoparticle-Composite-Sinter Produced by Low Temperature Heat Treatment

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Abstract

We have presented the study on the magnetoresistance intensification of (Fe3O4)1−X /(BaTiO3) X nanoparticle-composite-sinter (NPCS) produced by low temperature heat treatment. The average sizes of α-Fe2O3 and BaTiO3 nanoparticles are 30 nm and 40 nm, respectively. They were homogeneously mixed together and were sintered at 500 °C for 3 hours in the atmosphere of Ar(90%)/H2(10%). X of (Fe3O4)1−X /(BaTiO3) X NPCS was varied between 0 and 0.75. With increasing X, the electrical resistivity (ER) increases and shows the Mott’s variable-range-hopping (VRH) conduction behavior in a wide temperature region. The negative differential magnetoresistivity (ND-MR) is observed for all samples in a moderately high magnetic field region. In a low magnetic field region, the MR shows a large hysteresis. As X increases, the variation of the MR is intensified. We consider that the total number of network channels of the electrical conduction is reduced and the spin scattering is consequently intensified.

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Authors and Affiliations

  1. Department of Physics, Konan University, Kobe, Hyogo, 658-8501, Japan

    H. Kobori, K. Uzimoto, A. Hoshino, A. Yamasaki & A. Sugimura

  2. Department of Physics, Osaka University, Toyonaka, Osaka, 560-0043, Japan

    T. Taniguchi

  3. Nanotechnology Research Institute, AIST, Tsukuba, Ibaraki, 305-8568, Japan

    T. Horie, Y. Naitoh & T. Shimizu

Authors
  1. H. Kobori
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  2. K. Uzimoto
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  3. A. Hoshino
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  4. A. Yamasaki
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  5. A. Sugimura
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  6. T. Taniguchi
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  7. T. Horie
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  8. Y. Naitoh
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  9. T. Shimizu
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Correspondence to H. Kobori.

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Kobori, H., Uzimoto, K., Hoshino, A. et al. Magnetoresistance Intensification of Fe3O4/BaTiO3 Nanoparticle-Composite-Sinter Produced by Low Temperature Heat Treatment. J Supercond Nov Magn 25, 2809–2812 (2012). https://doi.org/10.1007/s10948-011-1271-9

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  • DOI: https://doi.org/10.1007/s10948-011-1271-9

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