Abstract
The study of gadolinium-bismuth iron garnet (GdBiIG) growth conditions led to a rough delimitation of the primary crystallization field of the garnet phase, with the following optimum composition of the melt (in mol%): 5.8 Gd2O3 + 34.1 Fe2O3 + 57.5 Bi2O3 + 2.6 V2O5. The addition of V2O5 is necessary to suppress crucible corrosion. A typical growth run in the range of 1370-940 K with a cooling rate of 1 K h−1 yields crystals of the mean composition Gd1.95Bi0.97Fe5.10O12. The slices with a final thickness of ≈ 0.3 mm, cut and polished from the crystals, showed the desired value of the Faraday rotation (FR) angle, 45 °. As an alternative, crystals of yttrium iron garnet (YIG) were grown by the top-seeding technique. Attention was devoted to making a detailed study of the temperature distribution in the melt and optimization of the forced stirring by the accelerated crucible rotation technique (ACRT). An extremely low cooling rate (0.1 K h−1) led to the growth of large crystals without inclusions. Cylindrical bars cut and polished from the YIG crystals showed the desired FR angle of 45 °.
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