Preparation of Bi-YIG particles for display devices

Garnet fine particles are prepared by coprecipitation. The saturation magnetization of the particles increases as the annealing temperature increases. Almost all X-ray diffraction peaks from the particles annealed at 700°C for 1 h are assigned to garnet. The prepared particles are classified in order to remove the aggregated large particles which are considered to prevent passing of light. The coercive force lowers to half of the initial value after the classification. Faraday rotation of the particles which are dispersed into methylene iodide is confirmed under a polarization microscope. Faraday rotation of the film coated of the particles are shown as a function of wavelength