We measure the growth temperature dependence of the magnetic and optical properties of lanthanum- and gallium-substituted yttrium iron garnet films deposited on gadolinium gallium garnet substrates by the liquid-phase-epitaxial-growth method for use as integrated optical waveguides. The magnetization of the film can be saturated in the film plane by a weak external-magnetic field (<45 Oe). The refractive index is controlled in a range of 2.192 to 2.204 by the growth temperature, which ranges from 893 to 835°C. Rib waveguides with low propagation loss (2.3 dB/cm at 1.55 µm wavelength evaluated by measuring the contrast in Fabry-Perot cavity resonance signals) are also fabricated.
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Sugimoto et al. (1992) studied this question.
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