Suppression of Jahn-Teller distortion by chemical pressure of SiO₂ and local structure analysis of CuFe₂O₄ nanoparticles

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  • Fujiwara K.
    Department of Physics, Graduate School of Engineering, Yokohama National University
  • Kimura S.
    Department of Physics, Graduate School of Engineering, Yokohama National University
  • Miyano S.
    Department of Physics, Graduate School of Engineering, Yokohama National University
  • Ide T.
    Department of Physics, Graduate School of Engineering, Yokohama National University
  • Ichiyanagi Y.
    Department of Physics, Graduate School of Engineering, Yokohama National University RCST, Graduate School of Science, Osaka University

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  • Suppression of Jahn–Teller Distortion by Chemical Pressure of SiO<sub>2</sub> and Local Structure Analysis of CuFe<sub>2</sub>O<sub>4</sub> Nanoparticles

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<p>  SiO2CuFe2O4 nanoparticles encapsulated by different amounts of amorphous SiO2 were prepared by a wet chemical method. These nanoparticles were characterized by X-ray diffraction and X-ray absorption fine structure analysis and found to have either a tetragonal or a cubic structure depending on the amount of SiO2. Magnetization measurements were performed for all samples using a SQUID magnetometer. The tetragonal nanoparticles showed a smaller maximum magnetization (MS) and a larger coercive force (HC) than the cubic nanoparticles.</p>

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