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

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

Research output: Contribution to journalArticle

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
Externally publishedYes

Fingerprint

Fused silica
Crystallization
Iron oxides
Magnetic properties
Crystallite size
Annealing
Nanoparticles
Coercive force
Thin films
Nanocomposite films
Composite films
Amorphous films
Magnetron sputtering
Hysteresis
Magnetization
Crystalline materials
Temperature
ferric oxide
Composite materials

Keywords

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

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

Cite this

Crystallization and magnetic property of iron oxide nanoparticles precipitated in silica glass matrix. / Masubuchi, Y.; Sato, Y.; Sawada, A.; Motohashi, T.; Kiyono, Hajime; Kikkawa, S.

In: Journal of the European Ceramic Society, Vol. 31, No. 14, 11.2011, p. 2459-2462.

Research output: Contribution to journalArticle

Masubuchi, Y. ; Sato, Y. ; Sawada, A. ; Motohashi, T. ; Kiyono, Hajime ; Kikkawa, S. / Crystallization and magnetic property of iron oxide nanoparticles precipitated in silica glass matrix. In: Journal of the European Ceramic Society. 2011 ; Vol. 31, No. 14. pp. 2459-2462.
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