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Your search keyword '"Syvorotka, I.M."' showing total 26 results
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26 results on '"Syvorotka, I.M."'

5. Magnetic force microscopy of YLaFeO films implanted by high dose of nitrogen ions

Author

Fodchuk, I.M., Gutsuliak, I.I., Zaplitniy, R.A., Balovsyak, S.V., Yaremiy, I.P., Bonchyk, O.Yu., Savitskiy, G.V., Syvorotka, I.M., and Lytvyn, P.M.

Subjects
Condensed Matter::Materials Science, Quantitative Biology::Tissues and Organs, Physics::Medical Physics, equipment and supplies, human activities
Abstract

The scattering field gradient maps of surface layer magnetic domains in Y₂.₉₅La₀.₀₅Fe₅O₁₂ iron-yttrium garnet modified by high-dose ion implantation with nitrogen ions N+ were obtained by the method of magnetic force microscopy. It was found that improving the magnetic properties of thin films, which includes reducing the observed magnetic losses after high-dose implantation, is accompanied by essential ordering of magnetic domains on the surface of the implanted films. There is a direct dependence of the magnetic properties on the dose of implanted atoms, accompanied by a significant dispersion and amorphization of surface layer and formation of a clear magnetic structure.

Published
2013

19. Growing Features and Luminescence of Bi3+ Ions in Gd3Ga5O12 Epitaxial Films

Author

Luchechko, Andriy P., Syvorotka, Igor I., Zakharko, Yaroslav, and Syvorotka, I.M.

Abstract

Abstract. Excitation and emission spectra under UV and X-ray excitations, as well as the luminescence decay kinetics of Gd3Ga5O12: 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 luminescent properties of Gd3Ga5O12: Bi3+ garnet have been revealed. The integral and relative intensities of the luminescence bands depend on the excitation wavelength. The Bi3+ decay curves of all investigated films show non-single exponential behavior at room temperature.

Published
2013
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20. Colour centres investigation in pure and doped yttrium aluminium garnet epitaxial films

Author

Ubizskii, S.B., Syvorotka, I.M., Melnyk, S.S., and Matkovskii, A.O.

Abstract

AbstractEpitaxial films with thickness of 10–250 μm of yttrium aluminium garnet (YAG) doped with Cr were grown by liquid phase epitaxy technique on YAG: Nd substrateds. Co-doping with Mg2+was used to force the Cr4+valent state formation. Dependence of absorption spectra of obtained films on melt-solution composition, growth conditiions and thermal treatment in reducing and oxidizing atmospheres is studied. The absorption being characteristic for YAG:Cr4+crystals is found in co-doped films grown at higher temperatures (1000–1100°C). The chromium entering in the tetravalent state is confirmed by the annealing experiments. A very intensive absorption band in UV region with maximum at 275 nm was found both in co-doped and YAG: Mg2+epifilms caused probbly by oxygen vacancies compensating the excess charge of Mg2+. Its intensity correlates with Cr4+content in the film in the following way: it decreases with Cr4+entering in the film.

Published
1999
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