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Crystallization and magnetic property of iron oxide nanoparticles precipitated in silica glass matrix
| 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 | | Nanocomposites | | 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) |
| URI: | http://hdl.handle.net/2115/47352 |
| 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)
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Submitter: 鱒渕 友治
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