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

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Title: Crystallization and magnetic property of iron oxide nanoparticles precipitated in silica glass matrix
Authors: Masubuchi, Y. Browse this author →KAKEN DB
Sato, Y. Browse this author
Sawada, A. Browse this author
Motohashi, T. Browse this author
Kiyono, H. Browse this author
Kikkawa, S. Browse this author
Keywords: Iron oxide
Thin film
Magnetic properties
Thermal annealing
Issue Date: Nov-2011
Publisher: Elsevier
Journal Title: Journal of the European Ceramic Society
Volume: 31
Issue: 14
Start Page: 2459
End Page: 2462
Publisher DOI: 10.1016/j.jeurceramsoc.2011.02.016
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 ε-Fe2O3 with the crystallite size of 20~30 nm was obtained after annealing the film deposited in SiO2 area ratio, x = 0.33~0.42 at 900℃. Lower SiO2 area ratio (x) than 0.25 and higher annealing temperature resulted in precipitation of α-Fe2O3 with the larger crystallite size than 40 nm. 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 ε-Fe2O3/SiO2 composite thin film showed ferromagnetic hysteresis with coercive force of 0.14 T.
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 鱒渕 友治

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