Abstract
The crystallization of bismuth substituted yttrium iron garnet (Bi-YIG) powder and thin film prepared by the metal-organic decomposition method (MOD) have been studied. In the powder analysis, it was observed that the pyrolysis of metal-organic compounds begins at 250 °C and completed at 450 °C from the thermo-gravimetric-differential thermal analysis experiment. The crystallization temperature of Bi-YIG powder was 900 °C, and at lower temperature, secondary YFeO 3, γ-Fe 2O 3, α-Fe 2O 3, and BiFeO 3 phases were observed by X-ray diffraction and Fourier transform infrared spectroscope. This crystallization temperature is higher than other chemical solution decomposition methods, so we suggest that the formation of BiFeO 3 in the MOD method increases the crystallization temperature. In the thin film analysis, the crystallization temperature for Bi-YIG is 750 °C, and at lower temperature, secondary phases are observed by X-ray diffraction. It is observed that high pre-annealing temperature promotes the crystallization of secondary phases. From the magneto-optical measurement, it was observed that the secondary phases strongly degrade the magneto-optical properties of the Bi-YIG thin film.
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