INFLUENCE OF GROWTH TEMPERATURE ON THE MAGNETIC AND OPTICAL-PROPERTIES OF LIQUID-PHASE-EPITAXIAL(LPE)-GROWN LANTHANUM-SUBSTITUTED AND GALLIUM-SUBSTITUTED YTTRIUM-IRON-GARNET ((LA, GA)-YIG) FILMS AND THEIR APPLICATION TO WAVE-GUIDES

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-degrees-C. Rib waveguides with low propagation loss (2.3 dB/cm at 1.55-mu-m wavelength evaluated by measuring the contrast in Fabry-Perot cavity resonance signals) are also fabricated.