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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Valsecchi, Jacopo, White, Jonathan S., Bartkowiak M., Treimer, Wolfgang, Kim, Youngju, Lee, Seung Wook, Gokhfeld D. M., Harti, Ralph P., Morgano, Manuel, Strobl, Markus, Grunzweig C.
Заглавие : Visualization of compensating currents in type-II/1 superconductor via high field cooling
Коллективы : Swiss National Science FoundationSwiss National Science Foundation (SNSF) [162582]; Korean-Swiss Science and Technology Programme [EG-KR-11-92017]
Место публикации : Appl. Phys. Lett. - 2020. - Vol. 116, Is. 19. - Ст.192602. - ISSN 0003-6951, DOI 10.1063/5.0004438. - ISSN 1077-3118(eISSN)
Примечания : Cited References: 38. - This work was partially funded by the Swiss National Science Foundation under Project No. 162582 and the Korean-Swiss Science and Technology Programme under Project No. EG-KR-11-92017. We gratefully acknowledge C. Carminati, M. D. Siegwart, M. Raventos, S. Samothrakitis, F. M. Piegsa, E. Lehmann, and C. Ruegg for fruitful discussions. We also thank M. Zolliker, S. Fischer, P. Schurter, S. Stamm, U. Filges, P. Hautle, J. Hovind, and M. Schild for technical support.
Предметные рубрики: DOMAINS
Аннотация: The morphology of vortex lattice domains in bulk type-II/1 superconductors is of central interest for many areas such as fundamental condensed matter physics, engineering science, and the optimization of materials for high transport current superconductivity applications. Here, we present a comprehensive experimental study of a single crystal niobium in the intermediate mixed state and Shubnikov phase with two complementary neutron techniques: high resolution polarized neutron imaging and small-angle neutron scattering. In this way, we were able to identify and visualize the occurrence of compensating currents, the flux line closure, and the freezing of the vortex spacing during the process of field cooling and high field cooling. With the combination of complementary neutron techniques, it was possible to add insights into the quest for the understanding of the flux pinning and nucleation of vortices in type-II/1 superconductors during the process of field cooling and high field cooling.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Oreshonkov A. S., Roginskii E. M., Shestakov N. P., Gudim I. A., Temerov V. L., Nemtsev I. V., Molokeev M. S., Adichtchev S. V., Pugachev A. M., Denisenko Yu. G.
Заглавие : Structural, electronic and vibrational properties of YAl3(BO3)4
Место публикации : Materials. - 2020. - Vol. 13, Is. 3. - Ст.545. - ISSN 1996-1944 (eISSN), DOI 10.3390/ma13030545
Примечания : Cited References: 72. - This research was funded by Russian Foundation for Basic Research (18-03-00750, 18-05-00682 and 18-32-20011)The computations were performed using the facilities of the Computational Center of the Research Park of St. Petersburg State University. We are grateful to the Center of collective use of FRC KSC SB RAS for the provided equipment namely Bruker Vertex 70V, Emitech K575XD, Hitachi TM3000 and Bruker Smart ApexII. Some parts of the experiments were performed in the multiple-access center “High-Resolution Spectroscopy of Gases and Condensed Matter” in IA&E SBRAS (Novosibirsk, Russia). The experimental part corresponding to Raman measurements was supported by the Ministry of Education and Science of the Russian Federation, grant no AAAA-A17-117052410033-9. The authors thank A.M. Sysoev and V.M. Sventitsky for assistance with sample orientation
Аннотация: The crystal structure of YAl3(BO3)4 is obtained by Rietveld refinement analysis in the present study. The dynamical properties are studied both theoretically and experimentally. The experimental Raman and Infrared spectra are interpreted using the results of ab initio calculations within density functional theory. The phonon band gap in the Infrared spectrum is observed in both trigonal and hypothetical monoclinic structures of YAl3(BO3)4. The electronic band structure is studied theoretically, and the value of the band gap is obtained. It was found that the YAl3(BO3)4 is an indirect band gap dielectric material.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aplesnin S. S., Masyugin A. N., Kretinin V. V., Yanushkevich K. I.
Заглавие : References regulating the BiMnxFe1-xO3 film conductivity upon cooling in magnetic and electric fields
Коллективы : Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [18-52-00009 bel_a, 18-32-00079 mol_a, 3.5743.2017/6.7]
Место публикации : Mater. Res. Express. - 2019. - Vol. 6, Is. 11. - Ст.116125. - ISSN 2053-1591, DOI 10.1088/2053-1591/ab4ec7
Примечания : Cited References: 19. - This study was supported by the Russian Foundation for Basic Research project no. 18-52-00009 bel_a, No. 18-32-00079 mol_a. This work is part of the research program the state order No. 3.5743.2017/6.7.
Предметные рубрики: DOMAINS
Аннотация: The magnetic and electrical properties of the BiFe1-xMnxO3 (x = 0.05, 0.15) films in the temperature range of 80–600 K have been investigated. The Curie temperature (Tc) of the films has been determined. A decrease in the conductivity of the films with x = 0.05 upon cooling in an electric field from the temperatures T ˂ Tc has been found. This effect has been described in the model of decreasing quantum well (domain wall) density and the tunneling coefficient drop. A decrease in the conductivity of the BiFe1-xMnxO3 film by more than an order of magnitude upon cooling from high temperatures in a magnetic field has been established. The experimental data are interpreted using the magnetic-field-induced magnetic structure variation and exchange splitting of the impurity subband.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Chzhan A.V., Patrin G. S., Kiparisov S. Ya., Seredkin V. A., Maltsev V. K., Krayukhin I. N.
Заглавие : The induced anisotropy and its influence on absorption of the NMR and domain structure of Co-P amorphous films
Коллективы : Euro-Asian Symposium "Trends in MAGnetism", "Trends in MAGnetism", Euro-Asian Symposium
Место публикации : Solid State Phenomena. - 2011. - Vol. 168-169. - P.145-148. - ISSN 10120394 ; 9783037850213, DOI 10.4028/www.scientific.net/SSP.168-169.145
Ключевые слова (''Своб.индексиров.''): amorphous magnetic films--coercive force--domain structure--induced anisotropy--nuclear magnetic resonance--amorphous films--cobalt--coercive force--crystals--magnetic anisotropy--magnetic devices--magnetic domains--magnetic films--metallic films--palladium--resonance--amorphous films--anisotropy--cobalt--coercive force--magnetic anisotropy--magnetism--palladium--amorphous magnetic films--domain structure--experimental research--induced anisotropy--intermediate layers--magnetization process--co-p films--nuclear magnetic resonance(nmr)--nuclear magnetic resonance--nuclear magnetic resonance
Аннотация: The results of experimental research into magnetic properties of amorphous Co-P films obtained by chemical sedimentation on various intermediate layers have been represented. The nuclear magnetic resonance (NMR) spectra of films sedimentated on intermediate layers of Pd crystal and amorphous NiP compound have been measured .The features of formation of domain structures and magnetization processes in the presence and absence of the induced anisotropy have been described.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Solovev P. N., Izotov A. V., Belyaev B. A., Boev N. M.
Заглавие : Micromagnetic simulation of domain structure in thin permalloy films with in-plane and perpendicular anisotropy
Место публикации : Physica B. - 2020. - Vol. 604. - Ст.412699. - ISSN 09214526 (ISSN), DOI 10.1016/j.physb.2020.412699
Примечания : Cited References: 31. - This work was supported by the Ministry of Science and Higher Education of the Russian Federation , agreement number 075-11-2019-054 dated 22.11.2019
Аннотация: We investigate the domain structure formation and magnetization processes in thin permalloy films with in-plane and perpendicular magnetic anisotropy by using micromagnetic simulation. We show that the films of thicknesses less than a critical value Lcr are in the monodomain state, and their magnetization processes are specified by the in-plane anisotropy. Above the critical thickness Lcr, the perpendicular anisotropy dominates, leading to the formation of the stripe domain structure that significantly complicates the magnetization reversal. The values of the critical thickness, parameters of the domain structure, and the saturation field obtained from the micromagnetic simulations are compared with the corresponding values calculated using analytical expressions derived by Murayama in the framework of the domain structures theory.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Parshin A. M., Barannik A. V., Zyryanov V. Ya., Shabanov V. F.
Заглавие : Light interference in a hybrid-aligned nematic layer with nonordered surface disclination lines
Место публикации : J. Opt. Soc. Am. B. - 2020. - Vol. 37, Is. 7. - P.2053-2057. - ISSN 0740-3224, DOI 10.1364/JOSAB.395976. - ISSN 1520-8540(eISSN)
Примечания : Cited References: 19
Предметные рубрики: LIQUID-CRYSTAL
SCATTERING
DEFECTS
DOMAINS
Аннотация: The propagation of a laser beam through a hybrid-aligned nematic layer with a surface disclination line has been investigated. A model of the light interference has been developed to consider the scattering by the structural inhomogeneities. The analytical expression that includes the factor characterizing an exponential decrease in the light scattering has been obtained. The dependence of the intensity of light transmitted through the layer on the magnetic field has been measured. The dependence has been accompanied by the interference oscillations. The theoretical expression is consistent with the experiment, which confirms the correctness of the model concepts.
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Вид документа : Статья из сборника (выпуск продолж. издания)
Шифр издания :
Автор(ы) : Volochaev M. N., Kveglis L. I., Loginov Yu. Yu.
Заглавие : Lorentz microscopy methods for magnetic domain structure study
Коллективы : International Scientific Conference Reshetnev Readings
Место публикации : IOP Conf. Ser.: Mater. Sci. Eng. - 2017. - Vol. 255, Is. 1. - Ст.012015. - , DOI 10.1088/1757-899X/255/1/012015
Примечания : Cited References: 12. - This research was supported by Fırat University Scientific Research Projects Unit MF.13.02). Authors acknowledge to Kemerli Firm (Turkey) for their material supports.
Ключевые слова (''Своб.индексиров.''): high resolution transmission electron microscopy--magnetic domains--magnetic structure--transmission electron microscopy
Аннотация: The capabilities of transmission electron microscope Hitachi HT7700 for magnetic domain structure (MDS) study of thin films using Lorentz transmission electron microscopy (LTEM) methods is discussed. Two methods of magnetic domain structure study (defocus method and aperture shift method, including low-angle electron diffraction (LAED)) in thin magnetic films were examined.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Parshin A. M., Shabanov A. V., Zyryanov V. Ya.
Заглавие : Interference of the light passing through LC domains formed on the polymer surface
Коллективы : European Conference on Liquid Crystals, Московский государственный университет им. М.В. Ломоносова
Место публикации : 14th Eur. Conf. Liq. Cryst. (ECLC): conf. programme/ чл. нац. орг. и прогр. ком. V. Ya. Zyryanov. - 2017. - Ст.P50. - Poster
Примечания : Библиогр.: 1
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Komogortsev S. V., Fel’k V. A., Iskhakov R. S., Shadrina G. V.
Заглавие : Micromagnetism in a planar system with a random magnetic anisotropy and two-dimensional magnetic correlations
Место публикации : J. Exp. Theor. Phys.: MAIK Nauka-Interperiodica / Springer, 2017. - Vol. 125, Is. 2. - P.323-332. - ISSN 10637761 (ISSN), DOI 10.1134/S1063776117070196
Примечания : Cited References: 68. - This work was supported by the Russian Foundation for Basic Research, project no. 16-03-00256.
Ключевые слова (''Своб.индексиров.''): anisotropy--crystallite size--defects--magnetic domains--magnetic materials--magnetism--magnetization--microstructure--stochastic systems--topology--dipole interaction--dipole interaction energy--magnetic correlation--magnetic microstructures--micromagnetic simulations--micromagnetic structure--random magnetic anisotropies--two-dimensional magnetization--magnetic anisotropy
Аннотация: The hysteresis loops and the micromagnetic structure of a ferromagnetic nanolayer with a randomly oriented local easy magnetization axis and two-dimensional magnetization correlations are studied using a micromagnetic simulation. The properties and the micromagnetic structure of the nanolayer are determined by the competition between the anisotropy and exchange energies and by the dipole–dipole interaction energy. The magnetic microstructure can be described as an ensemble of stochastic magnetic domains and topological magnetization defects. Dipole–dipole interaction suppresses the formation of topological magnetization defects. The topological defects in the magnetic microstructure can cause a sharper change in the coercive force with the crystallite size than that predicted by the random magnetic anisotropy model. © 2017, Pleiades Publishing, Inc.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Parshin A. M., Barannik A. V., Zyryanov V. Ya., Shabanov V. F.
Заглавие : Interference of nonpolarized light in liquid crystal domains on a polymer surface
Место публикации : J. Opt. Soc. Am. B. - 2019. - Vol. 36, Is. 7. - P.1845-1849. - ISSN 0740-3224, DOI 10.1364/JOSAB.36.001845. - ISSN 1520-8540(eISSN)
Примечания : Cited References: 23
Предметные рубрики: FRIEDERICKSZ THRESHOLD
FIELD
LAYER
FILM
Аннотация: The interference of nonpolarized light transmitted through an ensemble of nematic liquid crystal domains formed on a polycarbonate surface has been investigated. A model based on the superposition of the ordinary and extraordinary beams passing through domains with a radial structure has been developed. Expressions for the phase difference and intensity of the interfering beams have been derived that take into account the distribution of the liquid crystal director field. The dependences of the optical transmittance of a domain layer on the applied voltage have been calculated with regard to the material and optical constants of a liquid crystal and structural features and averaged morphological parameters of individual domains in the experimental sample. The results of the calculation are consistent with the experimental data, which confirms the validity of the proposed model. (C) 2019 Optical Society of America
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