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Magneto-optic Faraday rotation effect and the amount of bismuth substituted in yttrium iron garnet single crystal films prepared by gel-coating on modified gadolinium-gallium garnet substrates are investigated, where the gel is synthesized by a sol-gel reaction of nitrates and ethylene glycol. The coated gel is annealed in air at temperatures up to 660 ℃ for 4 h, which is about 300 ℃ lower than that of liquid-phase epitaxy. The maximum amount of Bi substitution is x =2.7 and the crystallization temperature of garnet phase decreases with the increase of x down to 520 ℃ for x =2.7. In this film, a huge Faraday rotation of -8.1×10 4 (°)/cm at λ =0.633 μm is obtained.
Magneto-optic Faraday rotation effect and the amount of bismuth substituted in yttrium iron garnet single crystal films prepared by gel-coating on modified gadolinium-gallium garnet substrates are investigated, where the gel is synthesized by a sol-gel reaction of nitrates and ethylene glycol The coated gel is annealed in air at temperatures up to 660 ° C for 4 h, which is about 300 ° C lower than that of liquid-phase epitaxy. The maximum amount of Bi substitution is x = 2.7 and the crystallization temperature of gar-phase epitaxy. with this increase of x down to 520 ° C. for x = 2.7. In this film, a huge Faraday rotation of -8.1 × 10 4 (°) / cm at λ = 0.633 μm is obtained.