Magnetic and magneto-optical properties of Co-containing Bi-DyIG particles dispersed in a plastic binder

Nano-size Co/sub x/:BiDy/sub 2/Al/sub 0.8/Fe/sub 4.2/O/sub 12/ (0/spl les/x/spl les/2.0) particles were prepared with a coprecipitation method. The coating films of the particles were prepared with a coating technique. The magnetic and magneto-optical properties of the particles and films were investigated. The M/sub S/ and H/sub C/ of the particles and films increased with Co content, x. The Faraday rotation dropped with x. The x=0.5 film has high H/sub C/ about 450 Oe, and the figure of merit at 520 nm is about 0.63. The particle size in the film was about 50/spl sim/100 nm which is smaller than the wavelength of the read and write laser (633 nm). These results show that the coating Co/sub x/:BiDy/sub 2/Al/sub 0.8/Fe/sub 4.2/O/sub 12/ film is a candidate material for a new economical magneto-optical storage medium.