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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Parshin A. M., Zyryanov V. Ya., Shabanov V. F.
Заглавие : Optical transmission modulation and spectral properties of self-organized nematic domains
Колич.характеристики :6 с
Место публикации : Opt. Mater. - 2024. - Vol. 150. - Ст.115232. - ISSN 09253467 (ISSN), DOI 10.1016/j.optmat.2024.115232. - ISSN 18731252 (eISSN)
Примечания : Cited References: 24
Аннотация: The modulation and spectral characteristics of self-organized ensembles of nematic domains with the disclination lines non-aligned and aligned in a magnetic field have been studied using an electric field. The obtained experimental voltage dependences of the light transmission agree well with the dependences calculated using the model considerations. These dependences have been compared with the electro-optical characteristics of a homogeneous planar nematic layer. The amplitude component of the optical transmission determined by light scattering and the oscillating component caused by the phase modulation have been examined. The effect of the spectral dispersion of transmission on the electro-optical characteristics of domain ensembles has been evaluated.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Паршин, Александр Михайлович
Заглавие : Структурные, магнитные, электрические и оптические когерентности в самоорганизованных ансамблях нематических доменов
Место публикации : Жидк. крист. и их практич. использ. - 2023. - Т. 23, № 2. - С. 71-80. - ISSN 19913966 (ISSN), DOI 10.18083/LCAppl.2023.2.71; Liq. Cryst. Appl. - ISSN 24999644 (eISSN)
Примечания : Библиогр.: 34
Аннотация: Исследованы структурные, магнито- и электрооптические свойства самоорганизованного ансамбля нематических доменов, сформированных на пленке поликарбоната в присутствии остаточного растворителя. Пленка наносилась на одну из плоскопараллельных стеклянных пластин жидкокристаллической ячейки. Магнитное поле, стабилизирующее планарную ориентацию жидкого кристалла, прикладывалось параллельно, а переориентирующее электрическое поле направлялось перпендикулярно поверхностям ячейки. Получены зависимости интенсивности прошедшего через доменный ансамбль света от электрического напряжения при различных фиксированных значениях магнитного поля. Проведено сравнение экспериментальных зависимостей с расчетными, определенными с использованием процедуры минимизации свободной энергии жидкого кристалла, с хорошим совпадением результатов. Из сопоставления структурной, магнитной и электрической длин когерентностей оценено взаимное влияние структурных элементов ансамбля и эффекты фазовой модуляции света.Structural, magneto- and electro-optical properties of a self-organized ensemble of nematic domains (SEND) formed on a polycarbonate film in the presence of a residual solvent have been studied. The film was deposited on one of the plane-parallel glass plates of a liquid-crystal cell. The magnetic field stabilizing the planar orientation of the liquid crystal was applied in parallel, while the reorienting electric field was directed perpendicular to the cell surfaces. The dependences of the intensity of light transmitted through the domain ensemble on the electric voltage are obtained for various fixed values of the magnetic field. The experimental dependences are compared with the calculated ones determined using the procedure for minimizing the free energy of the liquid crystal, with good agreement between the results. From a comparison of the structural, magnetic, and electrical coherence lengths, the mutual influence of the structural elements of the ensemble and the effects of phase modulation of light are estimated.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Паршин, Александр Михайлович
Заглавие : Модуляция светопропускания в самоорганизованных ансамблях нематических доменов
Колич.характеристики :9 с
Место публикации : Жидк. крист. и их практич. использ. - 2023. - Т. 23, № 4. - С. 49-57. - ISSN 19913966 (ISSN), DOI 10.18083/LCAppl.2023.4.49; Liq. Cryst. Appl. - ISSN 24999644 (eISSN)
Примечания : Библиогр.: 23
Аннотация: С использованием электрического поля исследовано пропускание света, прошедшего через самоорганизованные ансамбли нематических доменов. Проведено сравнение модуляционных характеристик ансамблей, содержащих домены с неориентированными и сориентированными в магнитном поле линиями дисклинаций. Показано существенное снижение рассеяния света при ориентации линий. Получены расчетные и экспериментальные зависимости пропускания света от электрического напряжения, прикладываемого к жидкокристаллическим ячейкам. Приведены хорошо совпадающие экспериментальные и рассчитанные из полученных ранее выражений зависимости. Изучены осцилляции на кривых светопропускания. Рассмотрены суперпозиции обыкновенных и необыкновенных волн, распространяющихся через доменные ансамбли и однородные планарные слои жидких кристаллов. Представлены спектральные характеристики ансамблей.Using an electric field, the transmission of light passing through self-organized ensembles of nematic domains is studied. The modulation characteristics of ensembles containing domains with unoriented and magnetic-field-oriented disclination lines are compared. A significant decrease in light scattering is shown when the lines are oriented. Calculated and experimental dependences of light transmission on the electric voltage applied to liquid crystal cells are obtained. Well agreeing experimental and calculated dependences obtained from the previously expressions are given. Oscillations on light transmission curves are studied. Superpositions of ordinary and extraordinary waves propagating through domain ensembles and homogeneous planar LC layers are considered. The spectral characteristics of the ensembles are presented.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Паршин, Александр Михайлович, Гуняков, Владимир Алексеевич, Зырянов, Виктор Яковлевич, Шабанов, Василий Филиппович
Заглавие : Структура и оптические свойства самоорганизованных ансамблей нематических доменов на поверхности поликарбоната
Место публикации : Жидк. крист. и их практич. использ. - 2022. - Т. 22, № 1. - С. 84-88. - ISSN 19913966 (ISSN), DOI 10.18083/LCAppl.2022.1.84; Liq. Cryst. Appl. - ISSN 24999644 (eISSN); Zidk. Krist. Prakt. Ispol'z.
Примечания : Библиогр.: 9
Аннотация: Рассмотрено структурное упорядочение самоорганизованных ансамблей нематических доменов с радиально-планарной конфигурацией, формирующихся на поверхности поликарбоната. Под влиянием теплового, упругого, электрического или магнитного полей структура доменов трансформируется в радиально-гомеотропную. При переориентации директора в данных структурах наблюдаются интерференционные осцилляции проходящего света с большой глубиной модуляции в отсутствие поляризаторов, что позволяет оценивать их как перспективный материал для оптических модуляторов.The structural ordering of self-organized ensembles of nematic domains (SEND) with a radial-planar configuration, which are formed on the polycarbonate surface, is considered. The domain structure is transformed into radialhomeotropic one under the influence of a thermal, elastic, electric or magnetic fields. Interference oscillations of transmitted light with a large modulation depth are observed in the absence of polarizers, when the director is reoriented in these structures, which makes it possible to evaluate them as a promising material for optical modulators.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Parshin A. M., Zyryanov V. Ya., Shabanov V. F.
Заглавие : Self-organized ensembles of nematic domains in magnetic and electric fields
Место публикации : Phys. Rev. E. - 2022. - Vol. 106, Is. 2. - Ст.024703. - ISSN 24700045 (ISSN), DOI 10.1103/PhysRevE.106.024703
Примечания : Cited References: 33
Аннотация: The structural and magneto- and electro-optical properties of a self-organized ensemble of nematic domains formed on a polycarbonate film in the presence of a residual solvent are studied. The film covered one of the plane-parallel glass plates of a liquid crystal cell. The magnetic field stabilizing the planar alignment of the liquid crystal was applied parallel to the cell surfaces and the reorienting electric field, perpendicular to them. The voltage dependences of the intensity of light transmitted through the domain ensemble were obtained at different constant values of the magnetic field. The comparison of the experimental dependences with the dependences calculated using the liquid crystal free-energy minimization procedure has shown good agreement between them. The mutual effect of structural elements of the ensemble and the effects of phase modulation of light are analyzed by comparing the structural, magnetic, and electric coherence lengths.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Svalov A. V., Gorkovenko A. N., Larranaga A., Volochaev M. N., Kurlyandskaya G. V.
Заглавие : Structural and magnetic properties of FeNi films and FeNi-based trilayers with out-of-plane magnetization component
Место публикации : Sensors. - 2022. - Vol. 22, Is. 21. - Ст.8357. - ISSN 14248220 (ISSN), DOI 10.3390/s22218357
Примечания : Cited References: 50. - This research was funded by the Russian Science Foundation (RSF), project no. 22-29-00980, https://rscf.ru/en/project/22-29-00980/ and in part by the Research Groups of the UPV-EHU
Аннотация: FeNi films of different thickness and FeNi/(Fe, Co)/FeNi trilayers were prepared by magnetron sputtering deposition onto glass substrates. The permalloy films had a columnar microstructure. The detailed analysis of the magnetic properties based on the magnetic and magneto-optical measurements showed that at thicknesses exceeding a certain critical thickness, hysteresis loops acquire a specific shape and the coercive force of the films increase sharply. The possibility of the estimation of the perpendicular magnetic anisotropy constant using the Murayama equation for the thickness dependence of saturation field was demonstrated. The results of studies of the structural and magnetic properties of FeNi films laminated by Fe and Co spacers with different thickness are presented.
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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) : 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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10.

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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11.

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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12.

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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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vyunishev A. M., Arkhipkin V. G., Baturin I. S., Akhmatkhanov A. R., Shur, V. Ya, Chirkin A. S.
Заглавие : Multiple nonlinear Bragg diffraction of femtosecond laser pulses in a χ(2) photonic lattice with hexagonal domains
Коллективы : Russian Foundation for Basic Research [15-02-03838]; Government of the Russian Federation (Act 211) [02.A03.21.0006]
Место публикации : Laser Phys. Lett. - 2018. - Vol. 15, Is. 4. - Ст.045401. - ISSN 1612-2011, DOI 10.1088/1612-202X/aaa618. - ISSN 1612-202X(eISSN)
Примечания : Cited References:26. - The work was supported by the Russian Foundation for Basic Research through grant 15-02-03838. ISB, ARA and VYS acknowledge the support of the Government of the Russian Federation (Act 211, Agreement 02.A03.21.0006).
Предметные рубрики: RAMAN-NATH DIFFRACTION
STRUCTURED FUNDAMENTAL WAVE
2ND-HARMONIC
Ключевые слова (''Своб.индексиров.''): nonlinear bragg diffraction--nonlinear photonic lattice--second harmonic--generation--femtosecond pulses
Аннотация: The frequency doubling of femtosecond laser pulses in a two-dimensional (2D) rectangular nonlinear photonic lattice with hexagonal domains is studied experimentally and theoretically. The broad fundamental spectrum enables frequency conversion under nonlinear Bragg diffraction for a series of transverse orders at a fixed longitudinal quasi-phase-matching order. The consistent nonstationary theory of the frequency doubling of femtosecond laser pulses is developed using the representation based on the reciprocal lattice of the structure. The calculated spatial distribution of the second-harmonic spectral intensity agrees well with the experimental data. The condition for multiple nonlinear Bragg diffraction in a 2D nonlinear photonic lattice is offered. The hexagonal shape of the domains contributes to multibeam second harmonic excitation. The maximum conversion efficiency for a series of transverse orders in the range 0.01%-0.03% is obtained.
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Parshin A. M.
Заглавие : Optical characteristics of liquid-crystal domains probed by a focused laser beam
Коллективы : Russian Foundation for Basic Research (RFBR) [15-02-06924, 16-53-00073]; Siberian Branch, Russian Academy of Sciences (SB RAS) [2P 0356-2015-0410, 0356-2015-041]
Место публикации : J. Opt. Technol. - 2018. - Vol. 85, Is. 1. - P.22-25. - ISSN 1070-9762, DOI 10.1364/JOT.85.000022. - ISSN 1091-0786(eISSN)
Примечания : Cited References:12. - Russian Foundation for Basic Research (RFBR) (15-02-06924, 16-53-00073); Siberian Branch, Russian Academy of Sciences (SB RAS) (2P 0356-2015-0410, 0356-2015-041).
Предметные рубрики: LIGHT-SCATTERING
POLYMER SURFACE
Аннотация: A technique for determining the optical characteristics of the domain structures of nematic liquid crystals using a focused laser beam is presented. The dependences of the intensity of polarized light on the voltage of a separate nematic domain formed by a polycarbonate surface in the presence of a magnetic field are obtained. It is shown that the optical characteristics cannot be interpreted within the framework of the concept of light scattering, which is suitable in the case of an ensemble of domains probed by a wide laser beam. The analysis of the results is based on the assumption of gradient index optics.
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ivanov A. A., Orlov V. A.
Заглавие : Self-organization of the magnetization in ferromagnetic nanowires
Коллективы : Euro-Asian Symposium "Trends in MAGnetism", "Trends in MAGnetism", Euro-Asian Symposium, Институт физики им. Л.В. Киренского Сибирского отделения РАН , RFBR [14-02-00238-a]
Место публикации : J. Magn. Magn. Mater.: Elsevier Science, 2017. - Vol. 440. - P.217-220. - ISSN 0304-8853, DOI 10.1016/j.jmmm.2016.12.053. - ISSN 1873-4766(eISSN)
Примечания : Cited References:21. - This study was supported by RFBR, Project no. 14-02-00238-a
Предметные рубрики: SYSTEM
ANISOTROPY
Ключевые слова (''Своб.индексиров.''): domain wall--nanowire--magnetic inhomogeneities--stochastic domains
Аннотация: In this work we demonstrate the occurrence of the characteristic spatial scale in the distribution of magnetization unrelated to the domain wall or crystallite size with using computer simulation of magnetization in a polycrystalline ferromagnetic nanowire. This is the stochastic domain size. We show that this length is included in the spectral density of the pinning force of domain wall on inhomogeneities of the crystallographic anisotropy. The constant and distribution of easy axes directions of the effective anisotropy of stochastic domain, are analytically calculated.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aplesnin S. S., Kretinin V. V., Panasevich A. M., Yanushkevich K. I.
Заглавие : Magnetic capacitance of the GdxBi1-xFeO3 thin films
Коллективы : Russian Foundation for Basic Research [15-42-04099 r_sibir'_a, 16-52-00045 Bel_a, 16-42-240436 r_a]; [114090470016]
Место публикации : Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2017. - Vol. 59, Is. 4. - P.667-673. - ISSN 1063-7834, DOI 10.1134/S1063783417040047. - ISSN 1090-6460(eISSN)
Примечания : Cited References:19. - This study was supported by the Russian Foundation for Basic Research, projects nos. 15-42-04099 r_sibir'_a, 16-52-00045 Bel_a, and 16-42-240436 r_a and the state order no. 114090470016.
Предметные рубрики: BiFeO3
Domains
Аннотация: The capacitance, inductance, and dissipation factor of the GdxBi1–xFeO3 films were measured in the temperature range of 100 K T 800 K in magnetic fields of up to 8 kOe at frequencies of 0.1–100 kHz. The magnetic susceptibility maxima in the low-temperature region and dependences of the relaxation time and inductance on prehistory of the films cooled in zero and nonzero magnetic fields are established. The giant increase in magnetic capacitance in the external bias electric field is found. The results obtained are explained by the domain structure transformation in external electric and magnetic fields.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Komogortsev S. V., Iskhakov R. S., Zimin A. A., Filatov E. Y., Korenev S. V., Shubin Y. V., Eremin E. V., Yurkin G. Yu.
Заглавие : Ordering and magnetic properties of nanostructured CoPt particles
Место публикации : Bull. Russ. Acad. Sci. Phys.: Allerton Press Incorporation, 2017. - Vol. 81, Is. 3. - P.298-300. - ISSN 10628738 (ISSN), DOI 10.3103/S1062873817030182
Примечания : Cited References: 9
Ключевые слова (''Своб.индексиров.''): crystallite size--bulk diffusions--copt alloys--degree of order--low-activation energy--nano-structured--ordering process--single domains--activation energy
Аннотация: The kinetics of ordering in nanostructured CoPt particles is investigated. The low activation energy (58 ± 2 kJ/mol) of the ordering process indicates that the kinetics of ordering is not limited by bulk diffusion. Coercivity grows along with the degree of ordering and reaches its maximum value of 14.2 kOe upon the complete ordering of CoPt alloy with a crystallite size of no more than that of a single domain. © 2017, Allerton Press, Inc.
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18.

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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19.

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
Материалы конференции,
Материалы конференции
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20.

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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