Magnetic and magneto-optical properties of nano-size Bi-YIG particles dispersed in a plastic binder

Magneto-optical films were prepared by coating nano-size BI-YIG particles, the Faraday rotation of the films were measured. The particle size was changed by milling with a planetary milling machine from Th to 100 h. The magnetic and magneto-optical properties were measured. The M-S of the films dropped with milling time, however, the peak values of Faraday rotation increased. The Faraday rotation spectra of the films changed with particle size. These results indicate that the magneto-optical properties of the coated films differ from those of sputterd films. The figure of merit of the coated films was 3.0 and comparable to that of sputtered films.