Preparation and Faraday rotation of Bi-YIG/PMMA nanocomposite |
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Authors: | HP Fu RY Hong YJ Wu GQ Di B Xu Y Zheng DG Wei |
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Institution: | 1. Department of Chemical Engineering and Key Laboratory of Organic Synthesis of Jiangsu Prov., Soochow University, Suzhou 215123, China;2. State Key Laboratory of Multiphase Reaction, Institute of Proc. Eng., Chinese Academy of Sciences, Beijing 100080, China;3. Department of Physics, Soochow University, Suzhou 215007, China;4. Nanotec, Inc., SIP, Suzhou 215123, China;5. Department of Chemical Engineering, University of New Brunswick, Fredericton, N.B., Canada E3B 5A3;6. Center for Nanoscale Sys., School of Engineering and Applied Sciences, Harvard University, 11 Oxford Street, Cambridge, MA 02139, USA |
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Abstract: | Bismuth-substituted yttrium iron garnet (Bi-YIG) nanoparticles (NPs) were prepared by coprecipitation and subsequent heating treatment. Thermal gravity-differential thermal analysis was performed to investigate the thermal behavior of the Bi-YIG precursors and to decide the best annealing temperature. Phase formation of garnet NPs was investigated by X-ray powder diffraction. The size of Bi-YIG NPs was investigated by transmission electron microscopy, and the magnetic properties of Bi-YIG NPs were measured using a vibrating sample magnetometer. The results show that the temperature needed for the transformation of Bi-YIG from the amorphous phase to the garnet phase decreases with increasing Bi content, and Bi-YIG NPs with sizes of 28–78 nm are obtained after heating treatment at 650–1000 °C. The saturation magnetization of Bi-YIG NPs increases as the Bi content increases. Moreover, the Faraday rotation of polymethyl methacrylate (PMMA) slices doped with Bi-YIG NPs was investigated. The results indicate that the angle of Faraday rotation increases with increasing Bi content in PMMA composites, and the maximum value of the figure of merit is 1.46°, which is comparable to the value of a sputtered film. The Bi-YIG NPs-doped PMMA slices are new promising materials for magneto-optical devices. |
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Keywords: | Bi-YIG Magnetic property Low-temperature annealing Faraday rotation |
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