2024-03-28T20:50:04Zhttps://eprints.lib.hokudai.ac.jp/dspace-oai/requestoai:eprints.lib.hokudai.ac.jp:2115/473522022-11-17T02:08:08Zhdl_2115_20045hdl_2115_139Crystallization and magnetic property of iron oxide nanoparticles precipitated in silica glass matrixMasubuchi, Y.Sato, Y.Sawada, A.Motohashi, T.Kiyono, H.Kikkawa, S.Iron oxideThin filmNanocompositesMagnetic propertiesThermal annealing573Crystallization 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.ElsevierJournal Articleapplication/pdfhttp://hdl.handle.net/2115/47352https://eprints.lib.hokudai.ac.jp/dspace/bitstream/2115/47352/1/JECS31-14_2459-2462.pdf0955-2219Journal of the European Ceramic Society3114245924622011-11enginfo:doi/10.1016/j.jeurceramsoc.2011.02.016author