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Abstract
Garnet films of nominal composition (Y,Nd)3Ga5O12, were grown on (110) 1°-off Gd3Ga5O12 substrates for investigation of their growth-induced optical anisotropy. Optical birefringence and directions of the electric vectors of polarized rays passing through the films were measured under a polarizing microscope using a Brace–Köhler compensator. The growth-induced anisotropy of these films optically exhibited orthorhombic characteristics with the X, Y, and Z optic elasticity axes coinciding with the [001], [110], and [1̄10] directions, respectively. The crystallographic data obtained by means of single-crystal diffractometry suggested that the cubic crystal system of the garnet film was distorted, though very slightly, to an orthorhombic one with a,b, and c axes that coincided, respectively, with the [1̄10],[001], and [110] of the original cubic cell. In addition, by annealing at 1150 °C, this distortion disappeared and the crystal system reverted to cubic.
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