For nanodimensional magnetically inhomogeneous amorphous granular films of the system (Co84Nb14Ta2)x(SiO2)100−x , 30≤x≤60 at.% the concentration dependences of the magnetooptical Kerr effect (MOKE) spectra and FMR have been investigated. The observed changes in the MOKE and FMR spectra are associated with transformations of microstructure and topology of the nanocomposites. For the compositions within the percolation region the transversal Kerr effect increases by an order of magnitude.
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Different optical crystals are reviewed from the viewpoint of their optical properties, among which typical crystals survived in the recent information technology (IT) systems. Most of revived or survived crystals are somehow traditional ones because of their established properties. Potential applications of oxide crystals into shorter wavelengths are focused as additional ripple effects of the impetuous deployment of the IT. Some recent activities on developing new crystals are described briefly ; GdVO₄ with a large walk-off angle as a birefringent crystal, Y₂O₃ as a new laser host, periodically poled ferroelectric LiNbO₃ and LiTaO₃ crystals as effective devices of frequency conversion, and traditional sapphire as a potential substrate of GaN-LEDs.
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