Browsing by Author "Syvorotka, I. M."

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Growth of thick epitaxial yag:Cr4+ films for passive q-switching of microchip lasers
(Видавництво національного університету „Львівська політехніка”, 2009) Syvorotka, I. I.; Syvorotka, I. M.; Ubizskii, S. B.
Growth peculiarities and magnetic properties of (LuBi)3Fe5O12 films by LPE method
(Видавництво Львівської політехніки, 2012) Syvorotka, I. I.; Syvorotka, I. M.; Ubizskii, S. B.
The series of (LuBi)3Fe5O12 film were grown on (111) oriented GGG substrate with diameters 1, 2 and 3 inch by liquid phase epitaxy using Bi2O3-base flux. Different types of surface morphology on the grown films were observed. The films’ surface was smooth and mirror while the film thickness was less than 13 μm and becomes rough for thickness above this value. The grown films were characterized by measuring magnetization loops and magneto-optic Faraday rotation under magnetization reversal as well as ferromagnetic resonance (FMR). All films with mirror surface demonstrate the in-plane magnetization, high Faraday rotation and FMR linewidth about 0.8 Oe at 9.1 GHz and room temperature.
Luminescence of Bi3+ Ions in GGG epitaxial films
(Видавництво Львівської політехніки, 2012) Luchechko, A.; Syvorotka, I. I.; Zakharko, Ya.; Syvorotka, I. M.
Absorption, emission spectra under UV and Xray excitations, as well as luminescence decay kinetics of GGG:Bi single crystalline films were studied. The emission spectra observed in the spectral region 350-700 nm at room temperature consist two elementary bands peaked at 446 and 521 nm. The influence of growth conditions on the optical-luminescent properties of GGG: Bi3+ garnet have been revealed. The ratio of the bands intensities in luminescence spectra under different types of excitation and their temperature dependencies were determined.
Optical absorption and luminescence of chromium doped Gd3Ga5O12 epitaxial films
(Видавництво національного університету “Львівська політехніка”, 2009) Zakharko, Ya.; Syvorotka, I. I.; Luchechko, A.; Syvorotka, I. M.; Sugak, D.; Vakiv, M.
Thick epitaxial YIG films with narrow FMR linewidth
(Видавництво Львівської політехніки, 2012) Syvorotka, I. I.; Syvorotka, I. M.; Ubizskii, S. B.
The La-doped yttrium iron garnet (YIG) films with thickness up to 130 μm were grown by liquid phase epitaxy (LPE) method. All grown thick films demonstrate “mirror” and “striation” types of surface morphology that depend from film growth temperature and thickness. Addition of B2O3 is favourable to a change the surface morphology into a “mirror” one. The mechanisms of the morphological changes are discussed. It was found that the ferromagnetic resonance (FMR) linewidth appreciably depends from surface morphology of grown films. For thick films with “mirror” surface the FMR linewidth is less than 0.8 Oe and more than ten times less in comparison with films with “striation” surface.