Effects of heating rate on the magneto-optical properties of bismuth-substituted yttrium iron garnet films prepared via modified metal-organic decomposition
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Yttrium Iron Garnet
Gadolinium gallium garnet
Bismuth
Gadolinium gallium garnet
Yttrium Iron Garnet
Pulsed Laser Deposition
Deposition
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The growth of iron-yttrium garnet Y3Fe5O12 (YIG) films with of 1...15 μm thicknesses on single-crystal substrates of gallium-gadolinium garnet Gd3Ga5O12 (GGG) was carried out using the method of liquid phase epitaxy (LPE). The influence of the composition and mass of the charge, the temperature regimes, the rates of movement and the substrate rotation on the films parameters were studied. The layered structure caused by the heterogeneity of the chemical composition in the film thickness was determined and studied The dependence of the degree impurity of Pb2+ and Pt4+ ions in YIG films and their influence on the ferromagnetic resonance (FMR) line width ∆H on the films growth conditions was investigated. It’s shown that in order to obtain by the LPE method the series of defect-free films with low magnetic losses and reproducible parameters, it’s necessary to use melt-solutions of large mass (6...12 kg) and apply their additional mixing during the growth process.
Gadolinium gallium garnet
Yttrium Iron Garnet
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Using the results of the phenomenological and microscopic description of magnetooptically active transitions presented in the beginning of the article, a review is made of the progress achieved in the understanding of the origin of the large bismuth induced magnetooptic effects in iron garnets. For applications involving the Faraday configuration, optical efficiencies are determined by the ratio of Faraday rotation (θ) to optical absorption (α). The dependence of θ/α on such variables as bismuth concentration, 4\piM_{s} and impurity ions is discussed with its spectral behavior. Finally, the behavior of bismuth substituted iron garnets in devices previously devised using unsubstituted iron garnets is discussed, in conjunction with devices which have only become feasible as a consequence of improvements in the optical properties of such iron garnets.
Bismuth
Faraday cage
Phenomenological model
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Gadolinium gallium garnet
Yttrium Iron Garnet
Ferrimagnetism
Laser linewidth
Laser Ablation
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Gadolinium gallium garnet
Yttrium Iron Garnet
Spin wave
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Very large bandwidth noncollinear coplanar magneto-optic interaction with magnetostatic forward volume waves in an yttrium iron garnet-gadolinium gallium garnet (YIG-GGG) waveguide is reported for the first time. Bandwidths of 0.78 and 1.03 GHz centered, respectively, at the carrier frequencies of 2.5 and 6.0 GHz, and TM0 -TE0 mode-conversion efficiencies of 0.54 and 0.50% have been achieved at the optical wavelength of 1.317 μm using a single microstrip transducer and homogeneous dc magnetic fields of 2200 and 3500 Oe. A summary of related coupled-mode analysis is also presented.
Yttrium Iron Garnet
Gadolinium gallium garnet
Waveguide
Magneto
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Gadolinium gallium garnet
Yttrium Iron Garnet
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Gadolinium gallium garnet
Yttrium Iron Garnet
Pulsed Laser Deposition
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The optical and magneto-optic (MO) properties of the praseodymium (Pr)-dopant effect on bismuth-substituted yttrium iron garnet (Bi:YIG) films coated on fused silica glass substrates by using the metal-organic-decomposition (MOD) method with chemical solutions were investigated at the 1310 and 1550-nm wavelength regions. The maximum Faraday rotation angle of the Pr-codoped Bi:YIG (Pr,By:YIG) film was observed to be 0.09 and 0.046 deg/μm at the wavelengths of 1310 and 1550 nm, respectively, when the film was annealed at a temperature of 750 °C, while those of the plain Bi:YIG film were 0.059 and 0.039 deg/μm. More than 50% improvement in the Faraday rotation value of the Pr,Bi:YIG film was observed compared to that of the Bi:YIG film at the 1310 nm wavelength. The absorption coefficient of the Pr,Bi:YIG film was comparable to that of the Bi:YIG film. Therefore, the Pr,Bi:YIG film prepared with the MOD method is potentially useful for MO applications such as optical isolators and circulators.
Yttrium Iron Garnet
Praseodymium
Bismuth
Optical Isolator
Gadolinium gallium garnet
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This paper describes the effects on Faraday rotation and optical absorption of substituting bismuth into various single crystal iron garnets. The large negative contribution to the Faraday rotation produced by the presence of bismuth is of the diamagnetic form and is associated with an optical transition around 415 nm. The magnitude of the bismuth contribution depends on the concentrations of bismuth and tetrahedrally coordinated Fe 3+ ions, suggesting that both these ions are involved in the transition responsible for the additional rotation. The absorption arising from the bismuth increases with decreasing wavelengths. However, the increase in magnitude of the rotation is such that the figure of merit is increased above that of YIG, peaking at 560 nm with a value of 5.2 deg/dB. The Faraday rotation and figure of merit of low magnetization garnets, suitable for magnetooptic devices, are also increased in the visible by the presence of bismuth.
Bismuth
Figure of Merit
Diamagnetism
Faraday cage
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