Structural, magnetic and magneto-optical properties of (YYbBi)(3)Fe5O12 single crystal for high-performance magneto-optical applications

A new composition of bismuth and ytterbium substituted yttrium iron garnet bulk single crystal (YYbBi)(3)Fe5O12 (YYbBiIG) was grown from a Bi2O3/B2O3 solvent using a spontaneous technique. The temperature derivative a of the Faraday rotation angle at 45 degrees has been modified by substituting Y3and Yb3+ ions in the dodecahedral site of iron garnet crystals. The structu ral and magneto-optical properties were investigated using XRD, VMS, near-i nfrared transmission spectrophotometry and spectroscopic Faraday polarimetr y. The Faraday rotation and optical absorption coefficient of Y1.43Yb0.82Bi 0.75Fe5O12 at 1550 nm were found to be -934 deg/cm and 1.60 cm(-1), respect ively. The Faraday rotation temperature derivative beta was 0.01 deg/degree sC at 1550 nm wavelength, the saturation magnetization 4 piM(s) has been es timated to be about 1200 G. The larger Faraday rotation, low optical loss, low saturation magnetization and nearly zero temperature derivative beta of the Faraday rotation of YYbBiIG crystal promise its use in high-performanc e magnetooptical application.