Magneto-optical properties and morphology of particulate film consisting of Bi-YIG coprecipitated particles

Abstract Magneto-optical properties of particulate films containing bismuth yttrium iron garnet small particles were investigated. The small particles with different crystallite sizes were prepared by coprecipitation method and changing heat treatment temperatures from 600° to 725°C. The crystallite size of the particle increased with raising heat treatment temperature and the saturation magnetization showed a maximum for the particles heated at 700°C. Oscillatory behavior of the Faraday rotation of the particulate film was also observed as a function of the heat treatment temperature. This can be well characterized by the magnetization and the absorption coefficient that abruptly increases around 650°C. The increase in the absorption coefficient was due to the change in the size of constituent garnet particles in the film. The magneto-optical properties and the morphology of the particulate films were examined in detail.