Microstructure of Bi_<1.5>Y_<1.5>Fe_5O_<12> Films Made by Pyrolysis : Magnetism, Magnetic Materials and Devices

概要

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Bi-substituted iron garnet films 0.06 μm〜0.06 μm in thickness (t) were made by prolysis. They were subjected to SEM and optical microscopic observations of microstructures. Starting around 600℃. Crystalline grains 1 μm〜2 μm in diameter were observed. A considerable amount of amorphous phase remained in thinner (t<0.3 μm) films even after they were annealed above 660℃ for a sufficient time. The saturation magnetization and Faraday rotation of the films thinner than 0.3 μm were considerably smaller than those in bulk samples, which might be ascribed to the amorphous phase. The thinner the film, the larger the amount of amorphous phase remaining, because surface free energy (which obstructs crystalline grain growth) increased as the film thickness decreased.
社団法人応用物理学会の論文
1988-11-20