Crystallization and magnetic property of iron oxide nanoparticles precipitated in silica glass matrix

Y. Masubuchi, Y. Sato, A. Sawada, T. Motohashi, H. Kiyono, S. Kikkawa

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14 Citations (Scopus)

Abstract

Crystallization and magnetic property of Fe2O3 nanoparticle precipitated in SiO2 matrix was investigated. Fe2O3/SiO2 nanocomposite thin film was obtained by annealing of the amorphous Fe-Si-O thin film deposited by RF-magnetron sputtering of (α-Fe2O3)1-x/(SiO2)x composite targets. The Fe2O3 crystallite size increased with decreasing SiO2 area ratio, x of the target and increasing annealing temperature. e{open}-Fe2O3 with the crystallite size of 20-30nm was obtained after annealing the film deposited in SiO2 area ratio, x=0.33-0.42 at 900°C. Lower SiO2 area ratio (x) than 0.25 and higher annealing temperature resulted in precipitation of α-Fe2O3 with the larger crystallite size than 40nm. In the case of SiO2 area ratio, x≥0.50, the annealed film was amorphous and showed higher magnetization and smaller coercivity due to the precipitation of very small crystalline γ-Fe2O3. The e{open}-Fe2O3/SiO2 composite thin film showed ferromagnetic hysteresis with coercive force of 0.14T.

Original languageEnglish
Pages (from-to)2459-2462
Number of pages4
JournalJournal of the European Ceramic Society
Volume31
Issue number14
DOIs
Publication statusPublished - 2011 Nov 1

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Keywords

  • Films
  • Iron oxide
  • Magnetic properties
  • Nanocomposites
  • Thermal annealing

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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