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We report on the synthesis of new magneto-optical materials with excellent optical and magneto-optical (MO) properties
for visible-range and near-infrared applications. Bi-substituted composite garnet films fabricated with excess bismuth
oxide content using RF co-sputtering and conventional oven-annealing processes are found to possess simultaneously a
record-high MO quality and strong uniaxial magnetic anisotropy. The films demonstrate nearly-square hysteresis loops
with specific Faraday rotations of up to 10.1 deg/μm at 532 nm and up to 2.6 deg/μm at 635 nm, which are significantly
larger than these measured in garnet films of the same composition prepared without extra bismuth oxide content.
Record-high MO figures of merit are demonstrated in our composite garnet materials due to a significant reduction in
the optical absorption coefficients achieved across the visible spectral range, thus making garnet-oxide composites
highly attractive for use in a range of magneto-optical applications.
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M. Nur-E-Alam, M. Vasiliev, K. Alameh, V. A. Kotov, "RF-sputtered Bi-substituted iron garnet composite films for visible-range magneto-optics," Proc. SPIE 7631, Optoelectronic Materials and Devices IV, 76311F (2 December 2009); https://doi.org/10.1117/12.850998