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A study of the hysteresis property of the current voltage characteristic in high-temperature superconductors / М. И. Петров [et al.] // Solid State Commun. - 1992. - Vol. 82, Is. 6. - P. 453-456, DOI 10.1016/0038-1098(92)90748-X. - Cited References: 21 . - ISSN 0038-1098

РУБ Physics, Condensed Matter
Рубрики:
HIGH-TC SUPERCONDUCTORS
YBA2CU3O7-X
FILMS
Аннотация: Temperature measurements of current-voltage characteristics (CVC) of the (Y, Lu)1Ba2Cu3O7-delta high-temperature superconductor have been performed. Analysis of the data shows that CVC of HTSC is mainly formed by two mechanisms: the creep of the Abrikosov vortices inside the crystallites and the Andreev reflection of the carriers within the metal character boundary between the crystallites.

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Держатели документа:
Институт физики им. Л.В. Киренского СО РАН

Доп.точки доступа:
Петров, Михаил Иванович; Petrov, M. I.; Krivomazov, S. N.; Khrustalev, B. P.; Хрусталев, Борис Петрович; Aleksandrov, K. S.; Александров, Кирилл Сергеевич
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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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Petrov, M. I.
Andreev reflection and experimental temperature dependences of the critical current in heterogeneous high-temperature superconductors (polycrystals and related composites) / M. I. Petrov, D. A. Balaev, D. M. Gokhfeld // Phys. Solid State. - 2007. - Vol. 49, Is. 4. - P. 619-626, DOI 10.1134/S106378340704004X. - Cited References: 41 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
CURRENT-VOLTAGE CHARACTERISTICS
   NORMAL-METAL
   WEAK LINKS
   JOSEPHSON-JUNCTIONS
   MODEL
   SCATTERING
   TRANSPORT
   DISSIPATION
   HYSTERESIS
Аннотация: The temperature dependences of the critical current of Y3/4Lu1/4Ba2Cu3O7 polycrystalline high-temperature superconductors subjected to annealing for different times and those of Y3/4Lu1/4Ba2Cu3O7 + BaPbO3 composites were measured. The results obtained were analyzed in terms of the Gunsenheimer-Schussler-Kummler theory considering the Andreev reflection of carriers in a "superconductor-normal metal-superconductor" (S-N-S) junction. Good agreement between the experimental and theoretical temperature dependences of the critical current over a wide temperature range for polycrystals with both natural and artificially created boundaries (composites) made it possible to estimate the effective length of grain boundaries in the high-temperature superconductors. It was revealed that the critical current density measured at 4.2 K is an exponential function of the length of grain boundaries in samples of both types.

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

Доп.точки доступа:
Balaev, D. A.; Балаев, Дмитрий Александрович; Gokhfeld, D. M.; Гохфельд, Денис Михайлович; Петров, Михаил Иванович
}
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Andreev reflection in natural grain boundaries of polycrystalline high-T-c superconductor La1.85Sr0.15CuO4 / M. I. Petrov [et al.] // Phys. Solid State. - 2003. - Vol. 45, Is. 7. - P. 1219-1222, DOI 10.1134/1.1594233. - Cited References: 30 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
CURRENT-VOLTAGE CHARACTERISTICS
   WEAK LINKS
   CHARGE-TRANSPORT
   JUNCTIONS
   CONDUCTIVITY
   HYSTERESIS
   COMPOSITES
   SCATTERING
Аннотация: The temperature evolution of the current-voltage characteristic (CVC) of a "break junction" with metal-type conductivity on the polycrystalline La1.85Sr0.15CuO4 high-temperature superconductor is investigated. The CVC exhibits gap peculiarities and hysteresis, which is observed in the region of negative differential resistance. The experimental results are described well in terms of the Kummel-Gunsenheimer-Nicolsky theory for an S-N-S junction (S is a superconductor, N is a normal metal) this theory takes into account multiple Andreev reflection of quasiparticles. It is shown that the shape of the CVC and the existence and the shape of hysteresis are determined by the ratio of "long" and "short" grain boundaries in the polycrystal under investigation. (C) 2003 MAIK "Nauka / Interperiodica".

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Держатели документа:
Russian Acad Sci, Siberian Div, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Reshetnev Siberian Stt. Aerosp. U., Krasnoyarsk 660014, Russian Federation

Доп.точки доступа:
Petrov, M. I.; Петров, Михаил Иванович; Balaev, D. A.; Балаев, Дмитрий Александрович; Gokhfel'd, D. M.; Гохфельд, Денис Михайлович; Shaikhutdinov, K. A.; Шайхутдинов, Кирилл Александрович
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Andreev reflections and experimental current-voltage characteristics of break junctions of polycrystalline HTSC / M. I. Petrov [et al.] // Physica C. - 2004. - Vol. 408: 7th International Conference on Materials and Mechanisms of Superconductive and High Temperature Superconductors (MAY 25-30, 2003, Rio de Janeiro, BRAZIL). - P. 620-622, DOI 10.1016/j.physc.2004.03.085. - Cited References: 3 . - ISSN 0921-4534

РУБ Physics, Applied

Кл.слова (ненормированные):
Andreev reflections -- break junction -- current-voltage characteristics -- Andreev reflections -- Break junction -- Current-voltage characteristics -- Andreev reflections -- Break junctions -- Elastic scattering -- Lattice defects -- Negative differential resistance -- Electric fields -- Heuristic methods -- Hysteresis -- Microcracks -- Polycrystalline materials -- Probability density function -- Quasicrystals -- Superconducting materials -- Yttrium barium copper oxides -- Current voltage characteristics
Аннотация: The temperature evolution of current-voltage characteristics (CVCs) of break junctions made from polycrystalline Y0.75Lu0.25Ba2Cu3O7 and La1.85Sr0.15CuO4 is investigated. The experimental CVCs have hysteretic features that reflect a part of a curve with negative differential resistance. The temperature evolution of the CVCs is discussed within the framework of the Kummel-Gunsenheimer-Nicolsky theory for superconductor/normal-metal/superconductor junctions considering multiple Andreev reflections. It is shown that the shape of the CVCs of break junctions is determined by the ratio of the number of "short" and "long" intergrain normal regions in the polycrystalline HTSC under investigation. (C) 2004 Elsevier B.V. All rights reserved.

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Держатели документа:
LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
Univ Wurzburg, Inst Theoret Phys & Astrophys, D-97074 Wurzburg, Germany
ИФ СО РАН
Kirensky Intitute of Physics, Akademgorodok, 660036 Krasnoyarsk, Russian Federation
Reshetnev Siberian Stt. Aerosp. U., 660014 Krasnoyarsk, Russian Federation
Inst. fur Theor. Phys./Astrophys., Universitat Wurzburg, D-97074 Wurzburg, Germany

Доп.точки доступа:
Petrov, M. I.; Петров, Михаил Иванович; Gokhfeld, D. M.; Гохфельд, Денис Михайлович; Balaev, D. A.; Балаев, Дмитрий Александрович; Shaihutdinov, K. A.; Kummel, R.
}
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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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Balaev, D. A.
Anisotropy of the magnetoresistance hysteresis in the granular superconductor Y-Ba-Cu-O at different magnetic-field and transport-current orientations / D. A. Balaev, S. V. Semenov, M. A. Pochekutov // J. Appl. Phys. - 2017. - Vol. 122, Is. 12. - Ст. 123902, DOI 10.1063/1.4986253. - Cited References: 45. - This study was supported by the Russian Foundation for Basic Research, Government of the Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund to the research project No. 16-48-243018. . - ISSN 0021-8979
Кл.слова (ненормированные):
Anisotropy -- High temperature superconductors -- Hysteresis -- Magnetic fields -- Magnetic flux -- Magnetism -- Magnetoresistance -- Different-magnetic fields -- External magnetic field -- Granular superconductors -- Macroscopic transport -- Magnetic flux compression -- Magneto transport properties -- Model representation -- Transport currents -- Superconducting materials
Аннотация: Dissipation in granular high-temperature superconductors (HTSs) during the passage of macroscopic transport current j is mainly determined by carrier tunneling through intergrain boundaries (Josephson junctions). In the presence of external magnetic field H, it is necessary to take into account the significant magnetic flux compression, which can lead to the situation when the effective field Beff in the intergrain boundaries exceeds the external field by an order of magnitude. This is observed as a wide hysteresis of the field dependence of magnetoresistance R(H). In this study, we investigate the R(H) hysteresis evolution in granular 1-2-3 HTSs in different j-H orientations. The magnetic flux compression significantly affects the magnetoresistance and its hysteresis for both perpendicular (H ⊥ j) and parallel (H ∥ j) orientations. The obtained experimental data on the R(H) hysteresis at the arbitrary angles θ = ∠H, j are explained using the approach developed for describing the magnetoresistance hysteresis in granular HTSs with regard to the magnetic flux compression and the model representations proposed by Daghero et al. [Phys. Rev. B 66(13), 11478 (2002)]. A concept of the effective field in the intergrain medium explains the well-known anisotropy of the magnetotransport properties of granular HTSs.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Semenov, S. V.; Семёнов, Сергей Васильевич; Pochekutov, M. A.; Балаев, Дмитрий Александрович
}
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Gokhfeld, D. M.
Asymmetric hysteresis loops, critical current and scale / D. M. Gokhfeld // 9th International Workshop on Processing and Applications of Superconducting (RE)BCO Large Grain Materials (PASREG 2015) : book of abstacts. - 2015. - P65

Материалы конференции

Доп.точки доступа:
Гохфельд, Денис Михайлович; International workshop on processing and applications of superconducting (RE)BCO large grain materials(9 ; 2015 ; sept. ; 2-4 ; Liège, Belgium)
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Change in the magnetic properties of nanoferrihydrite with an increase in the volume of nanoparticles during low-temperature annealing / D. A. Balaev [et al.] // Phys. Solid State. - 2016. - Vol. 58, Is. 9. - P. 1782-1791, DOI 10.1134/S1063783416090092. - Cited References: 32. - This study was supported by the Ministry of Education and Science of the Russian Federation within the State Task for 2014-2016. . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
FERRIHYDRITE NANOPARTICLES
   BACTERIAL FERRIHYDRITE
   FERRITIN
   HYSTERESIS
   MOSSBAUER
   ORIGIN
Аннотация: The results of the investigation into the effect of low-temperature annealing of a powder of nanoparticles of bacterial ferrihydrite on its magnetic properties have been presented. It has been found that an increase in the time (up to 240 h) and temperature (in the range from 150 to 200°C) of annealing leads to a monotonic increase in the superparamagnetic blocking temperature, the coercive force, and the threshold field of the opening of the magnetic hysteresis loop (at liquid-helium temperatures), as well as to an increase in the magnetic resonance line width at low temperatures and in the magnetic susceptibility at room temperature. At the same time, according to the results of the analysis of the Mossbauer spectra, the annealing of ferrihydrite does not lead to the formation of new iron oxide phases. Most of these features are well consistent with the fact that the low-temperature annealing of ferrihydrite causes an increase in the size of nanoparticles, which is confirmed by the results of transmission electron microscopy studies. © 2016, Pleiades Publishing, Ltd.

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Публикация на русском языке Изменение магнитных свойств наноферригидрита в ходе низкотемпературного отжига, обусловленное ростом объeма наночастиц [Текст] / Д. А. Балаев [и др.] // Физ. тверд. тела : Физико-технический институт им. А. Ф. Иоффе РАН, 2016. - Т. 58 Вып. 9. - С. 1724–1732

Держатели документа:
Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Akademgorodok 50/38, Krasnoyarsk, Russian Federation
Siberian Federal University, Svobodny pr. 79, Krasnoyarsk, Russian Federation
International Scientific Centre for Organism Extreme States Research, Presidium of the Krasnoyarsk Scientific Centre of the Siberian Branch of the Russian Academy of Sciences, Akademgorodok 50, Krasnoyarsk, Russian Federation
International Laboratory of High Magnetic Fields and Low Temperatures, ul. Gajowicka 95, Wroclaw, Poland

Доп.точки доступа:
Balaev, D. A.; Балаев, Дмитрий Александрович; Krasikov, A. A.; Красиков, Александр Александрович; Stolyar, S. V.; Столяр, Сергей Викторович; Iskhakov, R. S.; Исхаков, Рауф Садыкович; Ladygina, V. P.; Yaroslavtsev, R. N.; Bayukov, O. A.; Баюков, Олег Артемьевич; Vorotynov, A. M.; Воротынов, Александр Михайлович; Volochaev, M. N.; Волочаев, Михаил Николаевич; Dubrovskiy, A. A.; Дубровский, Андрей Александрович
}
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10.

Coexistence of the electric polarization and conductive current in the bismuth–neodymium ferrite garnet films / S. S. Aplesnin, A. N. Masyugin, M. N. Volochaev, T. Ishibashi // J. Mater. Sci. Mater. Electron. - 2021. - Vol. 32. - P. 3766-3781, DOI 10.1007/s10854-020-05121-9. - Cited References: 42 . - ISSN 0957-4522
Кл.слова (ненормированные):
Bismuth -- Bismuth compounds -- Dielectric materials -- Epitaxial films -- Ferroelectricity -- Gallium compounds -- Garnets -- Hysteresis -- Iron compounds -- Neodymium -- Neodymium compounds -- Piezoelectricity -- Single crystals -- Substrates
Аннотация: The Nd1Bi2Fe5O12/Nd2Bi1Fe4Ga1O12 polycrystalline films on the glass substrate and the Nd0.5Bi2.5Fe5O12 epitaxial films on the single-crystal gadolinium gallium garnet substrate have been investigated by impedance and dielectric spectroscopy. The inductive contribution to the impedance and two relaxation channels related to ferroelectric domains and migration polarization have been established. The magnetocapacitance and magnetoimpedance have been determined. The conductive and polarization currents and the phase difference between them for the films of two types have been determined. The critical temperatures of the polarization disappearance and hysteresis I–V have been found. A model of the polarization caused by the piezoelectric effect and flexoelectric interaction has been proposed. I–V hysteresis is explained by the presence of ferroelectric domains near the interface and is associated with the hysteresis of the electric polarization.

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Держатели документа:
Reshetnev Siberian State University of Science and Technology, Krasnoyarsk, Russian Federation
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russian Federation
Department of Materials Science and Technology, Nagaoka University of Technology, Nagaoka, Niigata 940-2188, Japan

Доп.точки доступа:
Aplesnin, S. S.; Masyugin, A. N.; Volochaev, M. N.; Волочаев, Михаил Николаевич; Ishibashi, T.
}
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11.

Complex study of magnetization reversal mechanisms of FeNi/FeMn bilayers depending on growth conditions / C. Gritsenko, V. Lepalovskij, M. Volochaev [et al.] // Nanomaterials. - 2022. - Vol. 12, Is. 7. - Ст. 1178, DOI 10.3390/nano12071178. - Cited References: 44. - This work has been supported by the grant of the Slovak Research and Development Agency under the contract No APVV-20-0324. This work was in part financially supported by the Ministry of Science and Higher Education of the Russian Federation, Subject of the state task No. FEUZ-2020-0051 . - ISSN 2079-4991
Кл.слова (ненормированные):
exchange bias -- exchange spring -- AFM grain size -- substrate temperature -- hysteresis loop asymmetry -- magnetization reversal
Аннотация: Magnetization reversal processes in the NiFe/FeMn exchange biased structures with various antiferromagnetic layer thicknesses (0–50 nm) and glass substrate temperatures (17–600 °C) during deposition were investigated in detail. Magnetic measurements were performed in the temperature range from 80 K up to 300 K. Hysteresis loop asymmetry was found at temperatures lower than 150 K for the samples with an antiferromagnetic layer thickness of more than 10 nm. The average grain size of FeMn was found to increase with the AFM layer increase, and to decrease with the substrate temperature increase. Hysteresis loop asymmetry was explained in terms of the exchange spring model in the antiferromagnetic layer.

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Держатели документа:
Research and Education Center “Smart Materials and Biomedical Applications”, Immanuel Kant Baltic Federal University, Gaidara str., 6, Kaliningrad, 236041, Russian Federation
Solid State Magnetism Department, Institute of Natural Sciences and Mathematics, Ural Federal University, Yekaterinburg, 620002, Russian Federation
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Akademgorodok 50/38, Krasnoyarsk, 660036, Russian Federation
Institute of Physics, Faculty of Science, Pavol Jozef Safarik University, Park Angelinum 9, Kosice, 040 01, Slovakia
Faculty of Physics and Center for Nanointegration (CENIDE), University of Duisburg-Essen, Duisburg, 47057, Germany
Faculty of Applied Physics and Mathematics, Gdansk University of Technology, Narutowicza 11/12, Gdansk, 80233, Poland
Materials Science and Metallurgy Shared Use Research and Development Center, National University of Science and Technology MISiS, Moscow, 119049, Russian Federation

Доп.точки доступа:
Gritsenko, C.; Lepalovskij, V.; Volochaev, M. N.; Волочаев, Михаил Николаевич; Komanicky, V.; Gorkovenko, A.; Pazniak, H.; Gazda, M.; Andreev, N.; Rodionova, V.
}
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12.

    Conversion of magnetic anisotropy in electrodeposited Co-Ni alloy nanowires / A. S. Samardak [et al.] // J. Magn. Magn. Mater. - 2015. - Vol. 383. - P. 94-99, DOI 10.1010/j.jmmm.2014.10.047. - Cited References:24. - This work was supported in part by the Russian Ministry of Education and Science and Far Eastern Federal University. M.N acknowledges the student financial support of Iranian Nanotechnology Initiative Council. . - ISSN 0304. - ISSN 1873-4766
   Перевод заглавия: Конверсия магнитной анизотропии в электроосажденных нанонитях сплава CoNi

РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
COBALT NANOWIRES
ARRAYS
Кл.слова (ненормированные):
Coercive force -- Magnetic anisotropy -- Magnetic hysteresis -- Binary alloy -- nanowires -- Alumina template -- Electrodeposition
Аннотация: In this paper, the influence of alternating current (ac) electrodeposition frequency and waveform is reported on chemical composition, microstructure and consequently magnetic properties of Co-Ni binary alloy nanowire arrays embedded in an alumina template. For sinusoidal and square electrodeposition waveforms the easy axis of magnetization rotates from being parallel to perpendicular orientation to nanowire long axis as the deposition frequency increases from 200 to 800 Hz. The reason for the drastic change of magnetic anisotropy in nanowires is attributed to the increase of cobalt content and the crystal structure phase transformation from fcc-hcp mixture at high Ni content to imp at high Co content. We explain the conversion of magnetic behavior of nanowire arrays in terms of a competition between the shape and magnetocrystalline anisotropies. (C) 2014 Elsevier B.V. All rights reserved.

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Держатели документа:
Far Eastern Fed Univ, Sch Nat Sci, Vladivostok, Russia.
Sahand Univ Technol, Fac Mat Engn, Tabriz, Iran.
SB Russian Acad Sci, Inst Phys, Krasnoyarsk, Russia.

Доп.точки доступа:
Samardak, A. S.; Nasirpouri, F.; Nadi, M.; Sukovatitsina, E. V.; Ognev, A. V.; Chebotkevich, L. A.; Komogortsev, S. V.; Комогорцев, Сергей Викторович; Russian Ministry of Education and Science; Far Eastern Federal University; Iranian Nanotechnology Initiative Council
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13.

Balaev, D. A.
Correlation between magnetoresistance and magnetization hysteresis in a granular high-T C superconductor: Impact of flux compression in the intergrain medium / D. A. Balaev, S. V. Semenov, M. I. Petrov // J. Supercond. Nov. Magn. - 2014. - Vol. 27, Is. 6. - P. 1425-1429, DOI 10.1007/s10948-014-2491-6. - Cited References: 27 . - ISSN 1557-1939. - ISSN 1557-1947

РУБ Physics, Applied + Physics, Condensed Matter
Рубрики:
HIGH-TEMPERATURE SUPERCONDUCTOR
   JOSEPHSON MEDIUM
   CRITICAL-STATE
   YBA2CU3O7-DELTA
   FIELDS
   BEHAVIOR
   HTSC
   COMPOSITES
   RESISTANCE
   MOTION
Кл.слова (ненормированные):
Granular superconductor -- Josephson medium -- Effective field -- Magnetoresistance -- Magnetization hysteresis
Аннотация: The correlation between experimental magnetic field dependences of magnetoresistance and magnetization hysteresis in granular YBa2Cu3O7 is established. Within the proposed approach, magnetoresistance is assumed to be determined by the effective field in the intergrain boundaries the ensemble of which is considered to be a Josephson medium. The effective field in the intergrain medium can be written in the form B (eff)(H)=H-4 pi M(H)x alpha, where alpha is the parameter of averaged demagnetizing factors of grains and the degree of flux compression. A comparison of experimental magnetoresistance R(H) and magnetization M(H) hysteresis dependences obtained at different external magnetic field sweep rates yields the value alpha similar to 10, which is caused by the flux compression between grains. The proposed model describes well most of the features of the magnetoresistance hysteresis in granular high-T (C) superconductors.

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Доп.точки доступа:
Semenov, S. V.; Семёнов, Сергей Васильевич; Petrov, M. I.; Петров, Михаил Иванович; Балаев, Дмитрий Александрович
}
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14.

Gokhfeld, D. M.
Critical current density and trapped field in HTS with asymmetric magnetization loops / D. Gokhfeld // J. Phys. Conf. Ser. - 2016. - Vol. 695, Is. 1. - Ст. 012008, DOI 10.1088/1742-6596/695/1/012008. - Cited References: 19 . - ISSN 1742-6588
Кл.слова (ненормированные):
Critical current density (superconductivity) -- Critical currents -- Current density -- Critical state models -- Field dependence -- Grain size -- Hysteresis curve -- Magnetization loops -- Superconducting grains -- Trapped field -- Trapped magnetic field -- Superconducting materials
Аннотация: Applications of the extended critical state model are considered. The trapped magnetic field, the penetration field and the field dependence of the critical current density are analysed. The critical current density and the trapped field in superconducting grains depend on the grain size. Asymmetry of the hysteresis curves relative to the M = 0 axis is related to the scale of the current circulation. © Published under licence by IOP Publishing Ltd.

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Доп.точки доступа:
Гохфельд, Денис Михайлович; International Workshop on Processing and Applications of Superconducting (RE)BCO Large Grain Materials(9th ; 2 - 4 Sept. 2015)
}
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15.

Day plots of bacterial magnetite from sediments of Lake Shira (Khakassia, Russia) / S. V. Semenov [et al.] // VI Euro-Asian Symposium "Trends in MAGnetism" (EASTMAG-2016) : abstracts / ed.: O. A. Maksimova, R. D. Ivantsov. - Krasnoyarsk : KIP RAS SB, 2016. - Ст. P12.1. - P. 557. - References: 3. - The work was supported by Russian Foundation for Basic Research and Krasnoyarsk Regional Scientific Foundation, Grant No. 15-45-04272 . - ISBN 978-5-904603-06-9
Кл.слова (ненормированные):
nanoparticles -- magnetic hysteresis -- bacterial magnetite

Доп.точки доступа:
Semenov, S. V.; Семёнов, Сергей Васильевич; Balaev, D. A.; Балаев, Дмитрий Александрович; Shaikhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Rogozin, D. Yu.; Рогозин, Денис Юрьевич; Euro-Asian Symposium "Trends in MAGnetism"(6 ; 2016 ; Aug. ; 15-19 ; Krasnoyarsk); "Trends in MAGnetism", Euro-Asian Symposium(6 ; 2016 ; Aug. ; 15-19 ; Krasnoyarsk); Институт физики им. Л.В. Киренского Сибирского отделения РАН

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16.

    Day plots of bacterial magnetite from sediments of shira lake (Khakassia, Russia) / S. V. Semenov [et al.] // J. Sib. Fed. Univ. Math. Phys. - 2017. - Vol. 10, Is. 2. - P. 252-256 ; Журн. СФУ. Сер. "Математика и физика", DOI 10.17516/1997-1397-2017-10-2-252-256. - Cited References: 4 . - ISSN 1997-1397
   Перевод заглавия: Графики Дэя для бактериального магнетита из донных отложений озера Шира (Хакасия, Россия)
Кл.слова (ненормированные):
Nanoparticles -- Magnetic hysteresis -- Bacterial magnetite -- наночастицы -- магнитный гистерезис -- бактериальный магнетит
Аннотация: The domain state of magnetite detected in sediments of Shira lake (Khakassia, Russia) was examined by means of magnetic hysteresis. Analysis of experimental data obtained on samples from different parts of bottom sediment cores in terms of Day plots allowed us to conclude that magnetite particles are in the pseudo-single-domain state. This indicates respectively small size of magnetite particles (˂ 100 nm) and reveals their bacterial origin. Biogenic magnetite buried in the bottom sediments can indicate the climatic changes in the Shira lake level in the Late Holocene.
Исследовано доменное состояние магнетита, обнаруженного в донных отложениях озера Шира (Хакасия, Россия). Из анализа экспериментальных данных по намагниченности образцов с разных участков керна донных отложений, а также на основе графиков Дэя сделан вывод, что частицы магнетита находятся в псевдооднодоменном состоянии. Это указывает на малый размер частиц магнетита (˂ 100 nm) и подтверждает их бактериальное происхождение. Биогенный магнетит, содержащийся в донных отложениях, может служить индикатором климатических изменений в уровне озера Шира в позднем голоцене.

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Держатели документа:
Kirensky Institute of Physics SB RAS, Akademgorodok, 50/38, Krasnoyarsk, Russian Federation
Siberian Federal University, Svobodny, 79, Krasnoyarsk, Russian Federation
Institute of Biophysics SB RAS, Akademgorodok, 50/50, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Semenov, S. V.; Семёнов, Сергей Васильевич; Balaev, D. A.; Балаев, Дмитрий Александрович; Shaykhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Rogozin, D. Y.

}
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17.

Balaev, D. A.
Developing a concept of an effective field in the intergrain medium of a granular superconductor: Effect of the intragrain Meissner currents and Abrikosov vortices trapped in grains on the magnetotransport properties of a Y-Ba-Cu-O granular HTS / D. A. Balaev, S. V. Semenov, D. M. Gokhfeld // J. Supercond. Nov. Magn. - 2023. - Vol. 36, Is. 7-9. - P. 1631-1648, DOI 10.1007/s10948-023-06608-2. - Cited References: 58. - The authors are grateful to M.I. Petrov, A.D. Balaev, and V.M. Sosnin for fruitful discussions and A.V. Shabanov and I.V. Nemtsev for scanning electron microscopy investigations. The scanning electron microscopy investigations and a part of magnetic measurements (performed on a LakeShore VSM 8604 facility) were carried out at the Krasnoyarsk Regional Center for Collective Use, Krasnoyarsk Scientific Center, Siberian Branch of the Russian Academy of Sciences. The study is performed within the state assignment of Kirensky Institute of Physics . - ISSN 1557-1939. - ISSN 1557-1947
Кл.слова (ненормированные):
Granular HTS -- Effective field in the intergrain medium -- Magnetoresistance hysteresis -- Magnetization hysteresis -- Trapped flux -- Meissner current -- Abrikosov vortex
Аннотация: Granular high-temperature superconductors (HTSs) are characterized by the hysteretic field dependences of magnetoresistance R(H) and critical current IC(H). These hysteretic effects are described within the concept of an effective field in the intergrain medium. The effective field is a superposition of external magnetic field H and the field induced by the magnetic moments of superconducting grains into intergrain spacings (grain boundaries). The magnetization of superconducting grains is determined by two contributions: Meissner (shielding) currents (MC) and trapped magnetic fluxes (Abrikosov vortices (AV)). To develop the concept of an effective field in the intergrain medium, the magnetotransport properties (R and IC) have been compared for two cases: (AV) the magnetization of superconducting grains is only determined by the trapped magnetic flux (zero external field) and (MC) HTS grains are in the Meissner state (the external field is weaker than the first critical field of grains). In a set of experiments, the main features of the hysteretic R(H) and M(H) dependences have been illustrated and the external conditions for implementing the AV and MC states have been established. It has been found that the effects of the Abrikosov vortices and intragrain Meissner currents on an effective field in the intergrain medium at the same magnetization values are noticeably different. This is a nontrivial fact that requires a thorough study of the impact of the anisotropy of the superconducting properties of grains on the configuration of the Meissner currents in them, as well as on the orientation of vortices both inside grains and near their surface. We suggest the explanation of observed stronger effect of the Meissner currents on the intergrain medium as compared with the effect of the Abrikosov vortices.

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

Доп.точки доступа:
Semenov, S. V.; Семёнов, Сергей Васильевич; Gokhfeld, D. M.; Гохфельд, Денис Михайлович; Балаев, Дмитрий Александрович
}
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18.

Dipolar interactions and magnetic hysteresis in random array of single-domain nanoparticles / O. A. Li, S. V. Komogortsev, V. A. Fel'k // Moscow Int. Symp. on Magnet. (MISM-2017) : 1-7 July 2017 : book of abstracts. - 2017. - Ст. 2PO-I1-46. - P. 275. - Cited References: 2. - Support by Russian Foundation for Basic Research, Grant No. 16-03-00969 is acknowledged.

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Доп.точки доступа:
Li, O. A.; Ли О.А.; Komogortsev, S. V.; Комогорцев, Сергей Викторович; Fel'k, V. A.; Moscow International Symposium on Magnetism(7 ; 2017 ; Jul. ; Moscow); Московский государственный университет им. М.В. Ломоносова; Российский фонд фундаментальных исследований
}
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19.

Semenov, S. V.
Dissipation in granular high-temperature superconductors: New approach to describing the magnetoresistance hysteresis and the resistive transition in external magnetic fields / S. V. Semenov, A. D. Balaev, D. A. Balaev // J. Appl. Phys. - 2019. - Vol. 125, Is. 3. - Ст. 033903, DOI 10.1063/1.5066602. - Cited References: 79. - The work was supported by the Russian Science Foundation (Grant No. 17-72-10050). We are grateful to K. Terent'ev for the preparation of the sample and D. Gokhfeld for useful discussions. . - ISSN 0021-8979. - ISSN 1089-7550

РУБ Physics, Applied
Рубрики:
CRITICAL-CURRENT-DENSITY
VORTEX-GLASS SUPERCONDUCTIVITY
ANISOTROPIC ENERGY-DISSIPATION
Аннотация: An approach to describing the R(H) magnetoresistance hysteresis in granular high-temperature superconductors and behavior of the R(T) resistive transition in these objects in an external magnetic field is proposed. The dissipation is attributed to the subsystem of intergrain boundaries, which form a Josephson junction network. The approach is based on accounting for the effect of magnetic moments of superconducting grains on the resulting (effective) field in the intergrain medium. The described procedure includes (i) establishing of the degree of magnetic flux crowding in the intergrain medium by comparing the experimental data on the R(H) magnetoresistance hysteresis and magnetization M(H), (ii) determining the effective field Beff in the intergrain medium as a function of external field H and temperature T with regard to the thermomagnetic prehistory, and (iii) fitting the experimental R(H) and R(T) dependences using the Arrhenius expression R ∼ exp(–EJ/ kB T), where EJ is the parameter corresponding to the Josephson coupling energy. The fundamental novelty of the proposed approach is the extraction of the functional dependences of EJ on the effective field Beff in the intergrain medium rather than on the external field H, as was made in many previous works. It is shown that the proposed approach makes it possible to adequately describe both the R(H) hysteretic dependences and R(T) dependences of the Y-Ba-Cu-O high-temperature superconductor samples with different morphologies and critical current densities.

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Держатели документа:
RAS, SB, KSC, Kirensky Inst Phys,Fed Res Ctr, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Balaev, A. D.; Балаев, Александр Дмитриевич; Balaev, D. A.; Балаев, Дмитрий Александрович; Семёнов, Сергей Васильевич; Russian Science Foundation [17-72-10050]
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20.

Domain structure and magnetization reversal in multilayer structures consisting of thin permalloy films separated with nonmagnetic interlayers / B. A. Belyaev, N. M. Boev, A. V. Izotov, P. N. Solovev // Russ. Phys. J. - 2021. - Vol. 64, Is. 6. - P. 1160-1167, DOI 10.1007/s11182-021-02436-w. - Cited References: 30. - This work was financially supported by the Ministry of Science and Higher Education under agreement No. 075-11-2019-054 November 22, 2019 . - ISSN 1064-8887. - ISSN 1573-9228

РУБ Physics, Multidisciplinary
Рубрики:
MICROMAGNETIC CALCULATION
   MAGNETOMETER
   SIMULATION
   NOISE
Кл.слова (ненормированные):
micromagnetic modeling -- multilayer magnetic film -- domain structure -- hysteresis loop -- microstrip resonator -- magnetic field sensor
Аннотация: Using numerical micromagnetic modeling, we have investigated the development of domain structure and magnetization reversal in multilayer thin-film structures. The permalloy (Ni80Fe20) magnetic layers had the inplane uniaxial and perpendicular magnetic anisotropy. We found that as the thickness of nonmagnetic interlayers decreases, the in-plane configuration of magnetic moments in the permalloy layers transforms from a single domain state to stripe domains, which is caused by the increase of magnetostatic interaction between layers. In structures with "thick" interlayers, even weak magnetostatic interaction enforces the neighboring single domain permalloy layers to have opposite orientations of magnetic moments. The saturation field of such samples increases linearly with the number of layers. By analyzing the dynamic characteristics of multilayers, we determined the optimum number of layers ensuring the maximum conversion efficiency of wideband microwave microstrip sensors of weak magnetic fields.

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Публикация на русском языке Доменная структура и процессы перемагничивания многослойных систем из тонких пленок пермаллоя с немагнитными прослойками [Текст] / Б. А. Беляев, Н. М. Боев, А. В. Изотов, П. Н. Соловьев // Изв. вузов. Физика. - 2021. - Т. 64 № 6. - С. 170-176

Держатели документа:
Russian Acad Sci, Kirensky Inst Phys Fed Res Ctr KSC, Siberian Branch, Krasnoyarsk, Russia.
Siberian Fed Univ, Krasnoyarsk, Russia.

Доп.точки доступа:
Belyaev, B. A.; Беляев, Борис Афанасьевич; Boev, N. M.; Боев, Никита Михайлович; Izotov, A. V.; Изотов, Андрей Викторович; Solovev, P. N.; Соловьев, Платон Николаевич; Ministry of Science and Higher EducationMinistry of Science and Higher Education, PolandEuropean Commission
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