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276 results on '"Minikayev, R."'

53. Ground State Er3+ Ion in the YGa3(BO3)4.

Author

PROKHOROV, A. A., CHERNUSH, L. F., MINIKAYEV, R., LANČOK, J., and PROKHOROV, A. D.

Subjects
IONS, IONS spectra, YTTRIUM, ERBIUM
Abstract

The paper presents the results of a ground state study of YGa3(BO3)4 crystals doped with erbium ions. The EPR spectrum of the Er3+ ion, which replaces yttrium ions in a crystal and is located in a slightly distorted prism of six oxygen ions, is detected and decoded. The parameters of the spin Hamiltonian describing the strongly anisotropic behavior of the spectrum are determined gk = 1:269(1), g⊥ = 9:34(6), Ak = 47:7(5) MHz, A⊥ = 320(9) MHz. [ABSTRACT FROM AUTHOR]

Published
2020
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55. Structural, magnetic, and magnetocaloric properties of Fe7Se8 single crystals

Author

Radelytskyi, I., primary, Aleshkevych, P., additional, Gawryluk, D. J., additional, Berkowski, M., additional, Zajarniuk, T., additional, Szewczyk, A., additional, Gutowska, M., additional, Hawelek, L., additional, Wlodarczyk, P., additional, Fink-Finowicki, J., additional, Minikayev, R., additional, Diduszko, R., additional, Konopelnyk, Y., additional, Kozłowski, M., additional, Puz´niak, R., additional, and Szymczak, H., additional

Published
2018
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61. Temperature-induced magnetic-anisotropy crossover in a Co/MgO/Co heterostructure.

Author

Gladczuk, L., Aleshkevych, P., Szymczak, R., Dluzewski, P., Aleszkiewicz, M., Paszkowicz, W., Minikayev, R., and Przyslupski, P.

Subjects
ANISOTROPY, HETEROSTRUCTURES, MAGNETIZATION, THIN films, MAGNETIC properties, FERROMAGNETIC resonance, REFLECTANCE, X-rays
Abstract

Phenomena occurring at the interface may significantly modify the properties of magnetic thin films. In this paper, the effect of temperature on the magnetic properties of Co(001)/MgO/Co trilayers is studied. The trilayer structure was modified by partial coverage of Co layers by Au at the Co/MgO interface. It is found that when the quantity of deposited gold is small, formation of islands at the Co/MgO interfaces takes place, which is proved by the topological surface analysis and by the x-ray reflectivity. In the investigated trilayer structure, gradual changes of the easy magnetization axis from the in-plane to the out-of-plane direction are observed during lowering the temperature from 300 to 5 K. The analysis of the ferromagnetic resonance spectra within the multiple-magnetic-layer model system indicates that the surface anisotropy provides a significant contribution to the magnetic anisotropy of complete Co(001)/MgO/Co heterostructure. [ABSTRACT FROM AUTHOR]

Published
2009
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62. Structure and magnetic characterization of La[sub 0.67]Sr[sub 0.33]MnO[sub 3]/YBa[sub 2]Cu[sub 3]O[sub 7] superlattices.

Author

Przyslupski, P., Komissarov, I., Paszkowicz, W., Dluzewski, P., Minikayev, R., and Sawicki, M.

Subjects
FERROMAGNETIC materials, METALLIC composites, SUPERCONDUCTORS, SUPERLATTICES, DIAMAGNETISM, PHYSICS
Abstract

Oxide multilayers composed of ferromagnetic metallic layers of La[sub 0.67]Sr[sub 0.33]MnO[sub 3] (LSMO) and superconducting cuprate YBa[sub 2]Cu[sub 3]O[sub 7] (YBCO) were grown on LaAlO[sub 3] substrates by high-pressure dc sputtering. We have investigated the structural, transport, and magnetic properties of a series of samples in which the LSMO layer thickness is fixed at eight unit cells and that of YBCO varied from one to six unit cells. The superconducting transition temperature T[sub c0] determined from the resistance measurement is higher than the temperature of the onset of the diamagnetic response T[sub d0]. This result is discussed in the frames of the model proposed by E. B. Sonin and I. Felner [Phys. Rev. B. 57, R14000 (1998)] for a ferromagnetic superconductor. The model suggests the presence of the spontaneous vortex phase in the temperature interval T[sub d0]

Published
2004
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66. Magnetic and Structural Studies of GeMnSnTe Epitaxial Layers

Author

Grochot, A., primary, Knoff, W., additional, Taliashvili, B., additional, Wołkanowicz, W., additional, Minikayev, R., additional, Pieniążek, A., additional, Łusakowska, E., additional, Sawicki, M., additional, Jantsch, W., additional, Story, T., additional, and Przybylińska, H., additional

Published
2017
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67. Mammalian cell defence mechanisms against the cytotoxicity of NaYF4:(Er,Yb,Gd) nanoparticles

Author

Sikora, B., primary, Kowalik, P., additional, Mikulski, J., additional, Fronc, K., additional, Kamińska, I., additional, Szewczyk, M., additional, Konopka, A., additional, Zajdel, K., additional, Minikayev, R., additional, Sobczak, K., additional, Zaleszczyk, W., additional, Borodziuk, A., additional, Rybusiński, J., additional, Szczytko, J., additional, Sienkiewicz, A., additional, Wojciechowski, T., additional, Stępień, P., additional, Frontczak-Baniewicz, M., additional, Łapiński, M., additional, Wilczyński, G., additional, Paszkowicz, W., additional, Twardowski, A., additional, and Elbaum, D., additional

Published
2017
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68. Thermal expansion of polycrystalline gallium nitride: an X-ray diffraction study

Author

Minikayev, R., Paszkowicz, W., Piszora, P., Knapp, M., Bähtz, C., and Podsiadlo, S.

Subjects
x-ray diffraction, Thermal expansion, gallium nitride
Abstract

Gallium nitride is studied at ambient and nonambient temperatures by powder X-ray diffraction followed by Rietveld refinement of the structure. The structure is reported for the ambient temperature on the basis of laboratory data. The diffraction data collected using a synchrotron beam serve for derivation of the lattice parameter and thermal expansion dependencies on temperature. The variation of unit-cell size on temperature was studied in detail in a broad range 11 K < T < 1073 K. The obtained dependencies of a, c and V and thermal expansion coefficients are smooth, and the results are consistent with previously collected data. The c/a ratio shows an almost linear decreasing trend with rising temperature. The magnitude of thermal expansion obtained in the described experiments is similar to a recently reported theoretical one.

Published
2015

72. Antiferromagnetic EuTe Clusters in Ge1-xEuxTe Semiconductors.

Author

KILANSKI, L., GÓRSKA, M., ARCISZEWSKA, M., PODGóRNI, A., MINIKAYEV, R., BRODOWSKA, B., RESZKA, A., KOWALSKI, B. J., SLYNKO, V. E., and SLYNKO, E. I.

Subjects
EUROPIUM compounds, GERMANIUM compounds, ANTIFERROMAGNETIC materials, SEMICONDUCTORS, MAGNETIC properties of solids
Abstract

We present studies of structural, electrical, and magnetic properties of Ge1-xEuxTe bulk crystals with the chemical composition, x, changing from 0.020 to 0.025. The sample synthesis leads to the formation of EuTe clusters in all our samples. Moreover, the presence of Ge1-xEuxTe spinodal decompositions with broad range of chemical contents is observed even for the sample with x = 0.020. Spinodal decompositions show the antiferromagnetic order with the Néel temperature, TN, equal to about 11 K, close to that for EuTe. The magnetic field dependence of the magnetization, M(B), is characteristic of the presence of magnetic inclusions in the samples. [ABSTRACT FROM AUTHOR]

Published
2018
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73. XPS Study of Te-protected Surface of Sn1-xMnxTe Topological Crystalline Insulator.

Author

DEMCHENKOA, I. N., SYRYANYY, Y., ZIEBA, M., MINIKAYEV, R., ŁUSAKOWSKA, E., WIATER, M., KONSTANTYNOV, P., WOJTOWICZ, T., and STORY, T.

Subjects
MANGANESE compounds, CRYSTAL structure, ELECTRIC insulators & insulation, EPITAXIAL layers, X-ray photoelectron spectroscopy
Abstract

We present X-ray photoelectron spectroscopy studies of epitaxial layers of Sn0.95Mn0.05Te/CdTe/GaAs(001) — a ferromagnetic topological crystalline insulator. We demonstrate that by terminating the molecular beam epitaxy growth of the layer with 20 nm crystalline Te cap one can protect the layer against oxidation at ambient conditions and, after short thermal annealing in X-ray photoelectron spectroscopy chamber, obtain atomically clean (001) surface of high crystal quality, suitable for angle-resolved photoelectron spectroscopy studies of surface topological states. [ABSTRACT FROM AUTHOR]

Published
2018
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74. STRUCTURE AND ELECTRICAL RESISTIVITY DEPENDENCE OF MOLYBDENUM THIN FILMS DEPOSITED BY DC MODULATED PULSED MAGNETRON SPUTTERING.

Author

WICHER, B., CHODUN, R., NOWAKOWSKA-LANGIER, K., OKRASA, S., KRÓL, K., MINIKAYEV, R., STRZELECKI, G., and ZDUNEK, K.

Subjects
THIN films, MAGNETRON sputtering, MICROSTRUCTURE, PLASMA gases, RADIO frequency
Abstract

This work reports the results of a study of Mo thin films synthesis by DC Pulsed Magnetron Sputtering method (PMS), operating at pulse main frequency of 100 kHz and modulated by the additional modulation frequency, driving in the range of 5-1000 Hz (modulated Pulse Magnetron Sputtering - mPMS). We have studied the influence of mPMS on plasma chemical reactions and mechanisms of layer growth using optical emission spectroscopy technique. Our experiment showed strong influence of mPMS method, on the morphology (scanning electron microscopy), phase composition (X-ray diffractometry) and electric properties (4-point probes method) of nanocrystalline and amorphous Mo films. From the utilitarian point of view, low value of resistivity - 43,2 μΩcm of synthesized Mo films predestines them as back contacts for thin solar cells CIGS. Our results revealed that additional modulation frequency should be considered as an important factor for optimization of films synthesis by means of PMS-based methods. [ABSTRACT FROM AUTHOR]

Published
2018
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82. Upconverting/magnetic: Gd2O3:(Er3+,Yb3+,Zn2+) nanoparticles for biological applications: effect of Zn2+ doping

Author

Kamińska, I., primary, Fronc, K., additional, Sikora, B., additional, Mouawad, M., additional, Siemiarczuk, A., additional, Szewczyk, M., additional, Sobczak, K., additional, Wojciechowski, T., additional, Zaleszczyk, W., additional, Minikayev, R., additional, Paszkowicz, W., additional, Stępień, P., additional, Dziawa, P., additional, Ciszak, K., additional, Piątkowski, D., additional, Maćkowski, S., additional, Kaliszewski, M., additional, Włodarski, M., additional, Młyńczak, J., additional, Kopczyński, K., additional, Łapiński, M., additional, and Elbaum, D., additional

Published
2015
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83. Observation of topological crystalline insulator surface states on (111)-oriented Pb1-xSnxSe films

Author

Polley, C. M., Dziawa, P., Reszka, A., Szczerbakow, A., Minikayev, R., Domagala, J. Z., Safaei, S., Kacman, P., Buczko, R., Adell, J., Hårdensson Berntsen, Magnus, Wojek, Bastian M., Tjernberg, Oscar, Kowalski, B. J., Story, T., Balasubramanian, T., Polley, C. M., Dziawa, P., Reszka, A., Szczerbakow, A., Minikayev, R., Domagala, J. Z., Safaei, S., Kacman, P., Buczko, R., Adell, J., Hårdensson Berntsen, Magnus, Wojek, Bastian M., Tjernberg, Oscar, Kowalski, B. J., Story, T., and Balasubramanian, T.

Abstract

We present angle-resolved photoemission spectroscopy measurements of the surface states on in-situ grown (111) oriented films of Pb1-xSnxSe, a three-dimensional topological crystalline insulator. We observe surface states with Dirac-like dispersion at (Gamma) over bar and (M) over bar in the surface Brillouin zone, supporting recent theoretical predictions for this family of materials. We study the parallel dispersion isotropy and Dirac-point binding energy of the surface states, and perform tight-binding calculations to support our findings. The relative simplicity of the growth technique is encouraging, and suggests a clear path for future investigations into the role of strain, vicinality, and alternative surface orientations in (Pb,Sn)Se solid solutions., QC 20150623

Published
2014
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84. High-pressure Diffraction Study of Selected Synthetic Garnets

Author

Werner-Malento, E., Minikayev, R., Paszkowicz, W., Dabkowska, H., Lathe, C., and CGS Centre for Geological Storage, Geoengineering Centres, GFZ Publication Database, Deutsches GeoForschungsZentrum

Subjects
550 - Earth sciences
Published
2009

85. Structural and magnetic properties of MBE grown MnSb layers on GaAs substrates

Author

Lawniczak-Jablonska, K., Wolska, A., Bak-Misiuk, J., Dynowska, E., Romanowski, P., Domagala, J. Z., Minikayev, R., Wasik, D., Klepka, M. T., Sadowski, J., Barcz, A., Dluzewski, P., Kret, S., Twardowski, A., Kaminska, M., Persson, A., Arvanitis, D., Holub-Krappe, E., and Kwiatkowski, A.

Subjects
ddc:530
Abstract

Journal of applied physics 106, 083524 (2009). doi:10.1063/1.3246806, Published by American Institute of Physics, Melville, NY

Published
2009

87. High-pressure Diffraction Study of CaMnO3

Author

Pietosa, J., Paszkowicz, W., Minikayev, R., Nowak, J., Orlinska, K., Lathe, C., Markovich, V., and 3.3 Chemistry and Physics of Earth Materials, 3.0 Geodynamics and Geomaterials, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum

Subjects
550 - Earth sciences
Published
2004

90. Observation of topological crystalline insulator surface states on (111)-oriented Pb1−xSnxSe films

Author

Polley, C. M., primary, Dziawa, P., additional, Reszka, A., additional, Szczerbakow, A., additional, Minikayev, R., additional, Domagala, J. Z., additional, Safaei, S., additional, Kacman, P., additional, Buczko, R., additional, Adell, J., additional, Berntsen, M. H., additional, Wojek, B. M., additional, Tjernberg, O., additional, Kowalski, B. J., additional, Story, T., additional, and Balasubramanian, T., additional

Published
2014
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95. Improvement of ZnO thin film properties by application of ZnO buffer layers

Author

Khranovskyy, V., Minikayev, R., Trushkin, S., Lashkarev, G., Lazorenko, V., Grossner, U., Paszkowicz, W., Suchocki, A., Svensson, B.G., Yakimova, Rositsa, Khranovskyy, V., Minikayev, R., Trushkin, S., Lashkarev, G., Lazorenko, V., Grossner, U., Paszkowicz, W., Suchocki, A., Svensson, B.G., and Yakimova, Rositsa

Abstract

The effect of ZnO buffer layers prepared at different temperatures on the structural, optical and morphological properties of the ZnO main layer is reported. ZnO thin films (comprising a buffer and a main layer) were deposited on (0 0 0 1) c-sapphire substrates by PEMOCVD. Two-step growth regimes were applied to realize a homoepitaxial growth on ZnO buffers: low-temperature ZnO buffer layer deposited at Ts=300 °C and the main layer at Ts=500 °C, high-temperature ZnO buffer layer deposited at Ts=500 °C and the main layer at Ts=300 °C. For comparison, a sample grown at high-temperature Ts=500 °C by one-step procedure was used. The low-temperature buffer layer has shown the most beneficial effect on the structural and morphological properties, as expressed by the narrowing of the (0 0 2) diffraction peak (FWHM=0.07°) and crystallite size enlargement. However, the surface roughness of this sample is higher then that of the sample grown by one-step procedure and this needs further considerations. The photoluminescence results seem to support a conclusion that the application of a low-temperature buffer layer among the studied temperature regimes is the most advantageous. © 2007 Elsevier B.V. All rights reserved.

Published
2007
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96. Thin films of ZnO and ZnMnO by atomic layer epitaxy

Author

Wojcik, A, Kopalko, K, Godlewski, M, Lusakowska, E, Guziewicz, E, Minikayev, R, Paszkowicz, W, Swiatek, K, Klepka, M, Jakiela, R, Kiecana, M, Sawicki, M, Dybko, K, Phillips, MR, Wojcik, A, Kopalko, K, Godlewski, M, Lusakowska, E, Guziewicz, E, Minikayev, R, Paszkowicz, W, Swiatek, K, Klepka, M, Jakiela, R, Kiecana, M, Sawicki, M, Dybko, K, and Phillips, MR

Published
2005

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