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A new composition of bismuth and ytterbium substituted yttrium iron garnet bulk single crystal (YYbBi)3Fe5O12 (YYbBiIG) was grown from a Bi2O3/B2O3 solvent using a spontaneous technique. The temperature derivative β of the Faraday rotation angle at 45° has been modified by substituting Y3+ and Yb3+ ions in the dodecahedral site of iron garnet crystals. The structural and magneto-optical properties were investigated using XRD, VMS, near-infrared transmission spectrophotometry and spectroscopic Faraday polarimetry. The Faraday rotation and optical absorption coefficient of Y1.43Yb0.82Bi0.75Fe5O12 at 1550 nm were found to be —934 deg/cm and 1.60 cm —1, respectively. The Faraday rotation temperature derivative β was 0.01 deg/°C at 1550 nm wavelength, the saturation magnetization 4πMs has been estimated to be about 1200 G. The larger Faraday rotation, low optical loss, low saturation magnetization and nearly zero temperature derivative β of the Faraday rotation of YYbBiIG crystal promise its use in high-performance magneto-optical application.
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Huang et al. (2001) studied this question.
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