We developed a new magnetooptical Bi{sub}1.8Y{sub}1.2Fe{sub}5O{sub}12 nanoparticle hybridized material which was composed of Bi{sub}1.8Y{sub}1.2Fe{sub}5O{sub}12 nanoparticles and a methylmethacrylate matrix, with and without polymethylmethacrylate. The Bi{sub}1.8Y{sub}1.2Fe{sub}5O{sub}12 nanoparticles were prepared using coprecipitation and annealing processes. The hybridized system was prepared by mechanical milling. In this system, polymethylmeth-acrylate was very important functional material as a dispersant. Without polymethylmethacrylate, the Bi{sub}1.8V{sub}1.2Fe{sub}5O{sub}12 nanoparticles aggregated. The magnetooptical properties of the solidified clear materials were measured.
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