Magneto-Optical Properties of Bi-YIG Nanoparticles and its Hybridized Material Dispersed in a Plastic

초록

Since bismuth yttrium iron garnet (Bi-YIG) has a large Faraday rotation in visible wavelength, the Bi-YIG could be the most attractive material for magneto-optical devices [1]. Ultrasonic irradiation in liquid can produce cavitation [2]. The cavitation leads to hot-spot and microjet impacts on materials which result in activating reaction, particle size reduction, surface cleaning, and so on. In this study, we were Bi-substituted YIG (Bi1.8Y1.2Fe5O12) nanoparticles by coprecipitation with ultra-sonic irradiation and examined the magneto-optical properties of the dispersed particles in a plastic hy-bridized material. With calcination at 650℃, the particles were identified as a garnet phase by X-ray diffraction. The parti-cle size was below 20nm and the saturation magnetization was 17 emu/g. The particles were dispersed in a plastic followed by a heat polymerization process under 70℃, 5 hour. And then the specimen was investigated for magneto-optical properties, which can demonstrate a valuable Faraday rotation. This work supported by grant No.R01-1999-000-00192-0 from the Basic Research Program of the Korea Science & Engineering Foundation. References [1] N. Kawai et al. IEEE Tran. Magn. 30, 4446 (1994) [2] D. Peters. J. Mater. Chem. 6, 1605 (1996)