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Izotov, A. V.
A METHOD FOR COMPUTING THE MICROWAVE ABSORPTION SPECTRUM IN A DISCRETE MODEL OF A FERROMAGNETIC / A. V. Izotov, B. A. Belyaev // Russ. Phys. J. - 2011. - Vol. 53, Is. 9. - P. 900-905, DOI 10.1007/s11182-011-9508-4. - Cited References: 8. - The work was supported in part by the Federal Purpose-Oriented Program "Scientific and Scientific-Pedagogical Staff of the Innovative Russia" for the years 2009-2013, RAS Presidium Project No. 27, and by the State Contract No. 02.740.11.0568. . - ISSN 1064-8887

РУБ Physics, Multidisciplinary
Рубрики:
MAGNETIZATION
Кл.слова (ненормированные):
magnetization oscillation -- Landau-Lifshitz equation -- absorption spectrum -- absorption spectrum -- Landau-Lifshitz equation -- magnetization oscillation
Аннотация: An effective method based on linearization of the Landau-Lifshitz equation has been developed to determine normal magnetization oscillation modes in a discrete model of a condensed medium. The possibility to calculate microwave absorption spectra for ferromagnetic specimens of any shape is shown.

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Держатели документа:
[Izotov, A. V.] Siberian Fed Univ, Krasnoyarsk, Russia
[Belyaev, B. A.] Russian Acad Sci, LV Kirenskii Inst Phys, Siberian Branch, Krasnoyarsk, Russia
ИФ СО РАН
Siberian Federal University, Krasnoyarsk, Russian Federation
L. V. Kirenskii Institute of Physics of the Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Belyaev, B. A.; Беляев, Борис Афанасьевич; Изотов, Андрей Викторович
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A METHOD FOR COMPUTING THE MICROWAVE ABSORPTION SPECTRUM IN A DISCRETE MODEL OF A FERROMAGNETIC [Text] / A. V. Izotov, B. A. Belyaev // Russ. Phys. J. - 2011. - Vol. 53, Is. 9. - P900-905, DOI 10.1007/s11182-011-9508-4. - Cited Reference Count: 8. - Гранты: The work was supported in part by the Federal Purpose-Oriented Program "Scientific and Scientific-Pedagogical Staff of the Innovative Russia" for the years 2009-2013, RAS Presidium Project No. 27, and by the State Contract No. 02.740.11.0568. - Финансирующая организация: Federal Purpose-Oriented Program; RAS Presidium [27]; State Contract [02.740.11.0568] . - FEB. - ISSN 1064-8887
Рубрики:

Кл.слова (ненормированные):
magnetization oscillation -- landau-lifshitz equation -- absorption spectrum -- absorption spectrum -- landau-lifshitz equation -- magnetization oscillation
Аннотация: An effective method based on linearization of the Landau-Lifshitz equation has been developed to determine normal magnetization oscillation modes in a discrete model of a condensed medium. The possibility to calculate microwave absorption spectra for ferromagnetic specimens of any shape is shown.

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Держатели документа:
Siberian Fed Univ, Krasnoyarsk, Russia
Russian Acad Sci, LV Kirenskii Inst Phys, Siberian Branch, Krasnoyarsk, Russia

Доп.точки доступа:
Izotov, A.V.; Belyaev, B. A.; Беляев, Борис Афанасьевич
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Gekht, R. S.
A quantum spin liquid in a two-layer triangular antiferromagnet / R. S. Gekht, I. N. Bondarenko // J. Exp. Theor. Phys. - 2005. - Vol. 101, Is. 5. - P. 868-880, DOI 10.1134/1.2149066. - Cited References: 43 . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
ONE-DIMENSIONAL ANTIFERROMAGNETS
   DIMER GROUND-STATE
   MEAN-FIELD THEORY
   HEISENBERG-ANTIFERROMAGNET
   SYSTEM SRCU2(BO3)(2)
   PHASE-TRANSITION
   GAP
   FLUCTUATIONS
   EXCITATIONS
   LATTICE
Кл.слова (ненормированные):
Antiferromagnetic materials -- Magnetic fields -- Magnetization -- Phase diagrams -- Spectrum analysis -- Thermodynamics -- Analogous systems -- Square lattices -- Thermodynamic quantities -- Two-layer triangular antiferromagnets -- Quantum theory
Аннотация: The possibility of implementing a quantum-spin-liquid-type state in a two-layer triangular spin-1/2 antiferromagnet at T = 0 is investigated. The ratio of intra- to interlayer exchange constants (j) is found under which a transition from the classical state with 120 degrees triangular order to a quantum state with zero magnetization per site occurs; in this case, the spins of adjacent layers form singlets that are separated from triplet excitations by an energy gap. Compared with an analogous system with the square lattice, the range of j in which the classical ordered state is realized turns out to be an order of magnitude smaller due to the effects of frustration; in this case, the behavior of thermodynamic quantities is analogous, on the whole, to that in two-layer square lattices; a difference manifests itself in the behavior of the gap in the spectrum of quasiparticles in an external magnetic field h. For small fields h, a j-h phase diagram is constructed that determines the domains in which the 120 degrees and the singlet phases exist. It is established that, in the neighborhood of the second-order phase transition, the contribution, to the thermodynamic quantities, of longitudinal spin fluctuations, which are disregarded in the spin-wave description, is comparable to the contribution of transverse fluctuations. (c) 2005 Pleiades Publishing, Inc.

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Держатели документа:
Russian Acad Sci, Kirenskii Inst Phys, Siberian Div, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirenskii Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, Akademgorodok, 660036, Russian Federation

Доп.точки доступа:
Bondarenko, I. N.
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Gokhfeld, D. M.
An extended critical state model: Asymmetric magnetization loops and field dependence of the critical current of superconductors / D. M. Gokhfeld // Phys. Solid State. - 2014. - Vol. 56, Is. 12. - P. 2380-2386, DOI 10.1134/S1063783414120129. - Cited References: 37 . - ISSN 1063-7834. - ISSN 1090-6460

РУБ Physics, Condensed Matter
Рубрики:
CRITICAL-CURRENT DENSITY
   HIGH-TEMPERATURE SUPERCONDUCTORS
   II SUPERCONDUCTORS
   SURFACE-BARRIER
   MGB2
   TRANSPORT
   MOTION
   J(C)
   PEAK
Аннотация: An extended critical state model has been developed. The model has considered the equilibrium magnetization of a surface layer and the magnetization of the central region of a superconducting sample. The magnetic flux distributions in the sample have been calculated. An analytical dependence of the critical current density on the magnetic field with different behaviors in strong and weak fields has been proposed. A relation of the asymmetry of the magnetization loops and the critical current density to the sample size has been established. The model is applicable to the parameterization of magnetization loops of single-crystal and polycrystalline superconductors.

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Публикация на русском языке Гохфельд, Денис Михайлович. Расширенная модель критического состояния: асимметричные петли намагниченности и полевые зависимости критического тока сверхпроводников [Текст] / Д. М. Гохфельд // Физ. тверд. тела : Физико-технический институт им. А. Ф. Иоффе РАН, 2014. - Т. 56 Вып. 12. - С. 2298-2304

Доп.точки доступа:
Гохфельд, Денис Михайлович
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    Analysis of magnetization loops of electrospun nonwoven superconducting fabrics / X. L. Zeng [et al.] // Phys. Rev. Materials. - 2017. - Vol. 1, No. 4. - Ст. 044802, DOI 10.1103/PhysRevMaterials.1.044802. - Cited References: 55. - We thank Prof. V. Presser (INM Saarbrücken and Saarland University) for the opportunity to use the electrospinning apparatus, and J. Schmauch (Saarland University, Prof. Birringer’s group) for technical assistance. The collaboration UdS-Nancy was supported by the EU-INTERREG IVa, project “Greater Region Magnetism Network (GRMN)”. This work was supported by the Volkswagen Foundation. . - ISSN 2475-9953
   Перевод заглавия: Анализ петель намагниченности сверхпроводящих полотен, полученных электроспиннингом
Аннотация: Networks of superconducting Bi2Sr2CaCu2O8 (Bi-2212) nanowires were fabricated by the electrospinning technique. The nanowires have a diameter of the order of 150–200 nm and lengths up to the micrometer range and form a nonwoven, fabric-like network with numerous interconnections enabling a current flow between the nanowires. The porosity of this nanowire network is 0.9928. Therefore, this material represents a novel class of ultraporous high-temperature superconductors. The magnetizations of the nanowire networks [M(T) and M(H)] were recorded by SQUID magnetometry. The magnetic properties were analyzed using the extended critical state model (ECSM). It is supposed that the averaged diameter of the nanowires rules the magnetic field dependence of the critical current density of the nanowire network. Single nanowires have remarkably high values of the critical current density of 1.04×107A/cm2 at 5 K. The macroscopic critical current density less than ∼0.05A/cm2 at 5 K is fine for this lightweight material. Using ECSM, several important magnetic parameters could be determined including the penetration field Hp, the irreversibility fields Hirr, the upper critical field Hc2, and the flux pinning forces. Applications for this material class may be found in the direction of sensors, thin shielding layers, or nanoporous bulks.

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Держатели документа:
Institute of Experimental Physics, Saarland University, Campus C 6 3, 66123 Saarbrücken, Germany
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Akademgorodok 50/38, Krasnoyarsk 660036, Russia
Institut Jean Lamour, UMR CNRS-Université de Lorraine, 54506 Vandœvre-lès-Nancy, France

Доп.точки доступа:
Zeng, Xian Lin; Karwoth, Thomas; Koblischka,, Michael R.; Hartmann, Uwe; Gokhfeld, D. M.; Гохфельд, Денис Михайлович; Chang, Crosby; Hauet, Thomas
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Krasikov, A. A.
Analysis of magnetization processes in antiferromagnetic nanoparticles in strong pulse fields (Brief review) / A. A. Krasikov, D. A. Balaev // J. Exp. Theor. Phys. - 2023. - Vol. 136, Is. 1. - P. 97-105, DOI 10.1134/S1063776123010132. - Cited References: 43. - The authors are grateful to V.L. Kirillov for synthesis of a set of NiO samples, O.N. Mart’yanov for cooperation and discussion of results for NiO nanoparticles, V.P. Ladygina for synthesis of nanoferrihydrite, S.V. Stolyar and R.S. Iskhakov for cooperation and discussion of results for ferrihydrite, and A.D. Balaev, K.A. Shaikhutdinov, and S.I. Popkov for the decisive contribution to the realization of pulse field setup . - ISSN 1063-7761. - ISSN 1090-6509
Аннотация: We present a brief review of investigations and analysis of magnetization curves M(H) for NiO and ferrihydrite antiferromagnetic nanoparticles in external fields up to 250 kOe. For correct interpretation of magnetic properties of systems of antiferromagnetic nanoparticles, it is important to take into account the segment of M(H) dependences, which corresponds to high fields (exceeding 100 kOe). We analyze the regularities in the formation of additional magnetic subsystems in antiferromagnetically ordered nanoparticles due to the influence of size effects. These additional subsystems (the ferromagnetic subsystem associated with uncompensated magnetic moment and the subsystem of surface free spins) are estimated quantitatively. It is shown that antiferromagnetic nanoparticles with a size of 5 nm acquire the properties of “nanomagnets,” which are not inferior to those for iron-oxide ferromagnetic nanoparticles of the same size.

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Публикация на русском языке Красиков, Александр Александрович. Исследование процессов намагничивания антиферромагнитных наночастиц в сильных импульсных полях (миниобзор) [Текст] / А. А. Красиков, Д. А. Балаев // Журн. эксперим. и теор. физ. - 2023. - Т. 163 Вып. 1. - С. 115-124

Держатели документа:
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, 660036, Krasnoyarsk, Russia

Доп.точки доступа:
Balaev, D. A.; Балаев, Дмитрий Александрович; Красиков, Александр Александрович; Eurasian Symposium “Trends in Magnetism”(8 ; 22-26 August 2022 ; Kazan, Russia)
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    Gokhfeld, D. M.
    Analysis of superconductor magnetization hysteresis / D. M. Gokhfeld // J. Sib. Fed. Univ. Math. Phys. - 2018. - Vol. 11, Is. 2. - P. 219-221 ; Журн. СФУ. Сер. "Математика и физика", DOI 10.17516/1997-1397-2018-11-2-219-221. - Cited References: 9 . - ISSN 1997-1397
   Перевод заглавия: Анализ петель намагниченности сверхпроводников
Кл.слова (ненормированные):
Pinning -- Abrikosov vortices -- Critical state -- Critical current density -- Trapped flux -- пиннинг -- вихри Абрикосова -- критическое состояние -- плотность критического тока -- захваченное поле
Аннотация: The critical state model and the extended critical state model are described to analyse a magnetization hysteresis and to find superconductor parameters. We discuss how geometric sizes and form influence on magnetization hysteresis, critical current and trapped flux.
Описано использование модели критического состояния и расширенной модели критического состояния для определения параметров сверхпроводников из измеренных петель намагниченности. Обсуждается влияние геометрических размеров и формы образцов на вид петель намагниченности, критический ток и замороженное магнитное поле.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Akademgorodok, 50/38, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Гохфельд, Денис Михайлович

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Anisotropic magnetization of an NbN film / D. M. Gokhfeld, N. E. Savitskaya, S. I. Popkov [et al.] // J. Exp. Theor. Phys. - 2022. - Vol. 134, Is. 6. - P. 707-712, DOI 10.1134/S1063776122060097. - Cited References: 31. - We are grateful to I.V. Nemtsev for measurements on the scanning electron microscope, S.A. Skorobogatov for his help in magnetic measurements (scanning electron microscopy and magnetic measurements have been performed at the Krasnoyarsk Regional Collective Usage Center of the Federal Research Center “Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences”) . - ISSN 1063-7761
Кл.слова (ненормированные):
Critical currents -- Magnetization -- Niobium compounds -- Nitrogen compounds -- Reactive sputtering -- Scanning electron microscopy -- Superfluid helium -- Anisotropic magnetization -- Columnar structures -- Field orientation -- Film magnetization -- Film surfaces -- Liquid helium temperature -- Magnetization loops -- Niobium nitride films -- Quartz substrate -- Structural and magnetic properties -- Current density
Аннотация: The structural and magnetic properties of a niobium nitride (NbN) film prepared by reactive sputtering onto a quartz substrate are investigated. It is shown using scanning electron microscopy that the film has a columnar structure with a diameter of crystallite columns of about 50 nm. The film magnetization loops are measured for the field orientation parallel and perpendicular to its surface. Based on the experimental data, the critical current densities of the film are estimated in both cases. For the field parallel to the film surface, the estimate is 6.5 × 104 A/cm2 at the liquid helium temperature. For the field perpendicular to the surface, the critical current density is close to the depairing current density (107 A/cm2). Analysis of the results based on different models of magnetic vortex pinning in superconductors shows that in the former case, pinning occurs at the boundaries of columns in the bulk of the sample, while in the latter case, it is determined by the influence of the surface barrier.

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Публикация на русском языке Анизотропная намагниченность пленки NbN [Текст] / Д. М. Гохфельд, Н. Е. Савицкая, С. И. Попков [и др.] // Журн. эксперим. и теор. физ. - 2022. - Т. 161 Вып. 6. - С. 833-839

Держатели документа:
Kirensky Institute of Physics, Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Konstantinov Petersburg Nuclear Physics Institute, Nation Research Center “Kurchatov Institute”, Leningrad oblast, Gatchina, 188300, Russian Federation
Krasnoyarsk Electric Railway-Carriage Repair Works, Krasnoyarsk, 660021, Russian Federation
Mordovia State University, Saransk, 430000, Russian Federation

Доп.точки доступа:
Gokhfeld, D. M.; Гохфельд, Денис Михайлович; Savitskaya, N. E.; Popkov, S. I.; Kuzmichev, N. D.; Vasyutin, M. A.; Balaev, D. A.; Балаев, Дмитрий Александрович
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    Anisotropic magnetocaloric properties of the ludwigite single crystal Cu2MnBO5 / A. G. Gamzatov, Y. S. Koshkid'ko, D. C. Freitas [et al.] // Appl. Phys. Lett. - 2020. - Vol. 116, Is. 23. - Ст. 232403, DOI 10.1063/5.0012490. - Cited References: 29. - This work was supported by the Russian Science Foundation under Grant No. 18-12-00415. The research was also carried out as part of the state task of the Ministry of Science of the Russian Federation (No. AAAA-A17-117021310366-5). . - ISSN 0003-6951. - ISSN 1077-3118
   Перевод заглавия: Анизотропные магнитокалорические свойства монокристалла людвигита Cu2MnBO5

РУБ Physics, Applied
Рубрики:
HEAT
MAGNETIZATION
Аннотация: We report upon the specific heat and magnetocaloric properties of Cu2MnBO5 over a temperature range of 60–350 K and in magnetic fields up to 18 kOe. It is found that at temperatures below the Curie temperature (TC ∼ 92 K), CP(T)/T possesses a linear temperature-dependent behavior, which is associated with the predominance of two-dimensional antiferromagnetic interactions of magnons. The temperature independence of CP/T = f(T) is observed in the temperature range of 95–160 K, which can be attributed to the excitation of the Wigner glass phase. The magnetocaloric effect [i.e., the adiabatic temperature change, ΔTad (T,H)] is assessed through a direct measurement or an indirect method using the CP(T,H) data. Owing to its strong magnetocrystalline anisotropy, an anisotropic magnetocaloric effect (MCE) or the rotating MCE [ΔTadrot (T)] is observed in Cu2MnBO5. A deep minimum in the ΔTadrot (T) near the TC is observed and ascribed to the anisotropy of the paramagnetic susceptibility.

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Держатели документа:
RAS, DFRC, Amirkhanov Inst Phys, Makhachkala 367003, Russia.
PAS, Inst Low Temp & Struct Res, PL-50950 Wroclaw, Poland.
Univ Fed Fluminense, Inst Fis, Campus Praia Vermelha, BR-24210346 Niteroi, RJ, Brazil.
RAS, SB, LV Kirensky Inst, Krasnoyarsk 660036, Russia.
Ulsan Natl Inst Sci & Technol, Dept Phys, Ulsan 44919, South Korea.
Univ S Florida, Dept Phys, 4202 East Fowler Ave, Tampa, FL 33620 USA.

Доп.точки доступа:
Gamzatov, A. G.; Koshkid'ko, Y. S.; Freitas, D. C.; Moshkina, E. M.; Мошкина, Евгения Михайловна; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Aliev, A. M.; Yu, S-C; Phan, M. H.; Russian Science FoundationRussian Science Foundation (RSF) [18-12-00415]; Ministry of Science of the Russian Federation [AAAA-A17-117021310366-5]
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10.

Anisotropy and crystallite misalignment in textured superconductors / D. M. Gokhfeld, S. V. Semenov, M. I. Petrov [et al.] // J. Supercond. Nov. Magn. - 2023. - Vol. 36, Is. 1. - P. 59-65, DOI 10.1007/s10948-022-06454-8. - Cited References: 21. - This work was supported by the Russian Foundation for Basic Research and the Government of the Krasnoyarsk Territory, Krasnoyarsk Territorial Foundation for Support of Scientific and R&D Activities, project “Superconducting properties of YBCO incorporated by paramagnetic rare-earth elements” No. 20–42–240008 . - ISSN 1557-1939. - ISSN 1557-1947
Кл.слова (ненормированные):
Critical current -- Anizotropy -- BSCCO -- Texture -- Distribution function -- Magnetization -- Hysteresis loop
Аннотация: A misalignment of anisotropic crystallites causes small values of anisotropy and decreases the critical current density of textured polycrystalline superconductors. To relate the crystallite misalignment and out-plane anisotropy, the magnetic properties of the textured Bi2223 polycrystalline superconductor were investigated. A distribution of orientation angles of crystallites was determined using different data: scanning electron microscopy images and hysteresis magnetization loops when an external magnetic field was applied at different angles with respect to the texturing plane of the sample. It was demonstrated that the standard deviation of the distribution and the magnetic disorder angle of crystallites in textured samples can be determined from the magnetization data in perpendicular directions. These data may be either the irreversible magnetization measured for two different orientations of the sample or the simultaneously measured magnetization projections parallel and perpendicular to the magnetic field.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russia
Siberian Federal University, Krasnoyarsk, 660041, Russia
Federal Research Center “Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Sciences”, Krasnoyarsk, 660036, Russia

Доп.точки доступа:
Gokhfeld, D. M.; Гохфельд, Денис Михайлович; Semenov, S. V.; Семенов, Сергей Васильевич; Petrov, M. I.; Петров, Михаил Иванович; Nemtsev, I. V.; Немцев, Иван Васильевич; Balaev, D. A.; Балаев, Дмитрий Александрович
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