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1.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Dubrovskiy A. A., Semenov S. V., Knyazev Yu. V., Popkov S. I., Yakushkin S., Kirillov V., Martyanov O., Balaev D. A.
Заглавие
: The Low-Temperature Magnetic State and Magnetic Ordering Temperature of ϵ-Fe2O3 Iron Oxide Nanoparticles
Место публикации
: IEEE Magn. Lett. - 2019. - Vol. 10. - Ст.6110103. - ISSN 1949307X (ISSN),
DOI
10.1109/LMAG.2019.2956674
Примечания
: Cited References: 22
Предметные рубрики:
Magnetic resonance
Magnetic
hysteresis
Temperature distribution
Saturation magnetization
Nanoparticles
Perpendicular magnetic anisotropy
Аннотация:
The ϵ-Fe2O3 iron oxide polymorph is a well-known magnetic material with a complex magnetic structure, which undergoes a series of magnetic transitions in different temperature ranges. However, the ϵ-Fe2O3 phase diagram is still unclear. We report on the magnetic properties of a sample consisting of ϵ-Fe2O3 nanoparticles with an average size of 8 nm embedded in a SiO2 xerogel matrix without an admixture of foreign phases. Along with the features typical of the well-known ϵ-Fe2O3 magnetic transition in the temperature range 80–150 K, the temperature dependence of magnetization M(T) of ϵ-Fe2O3 includes other low-temperature anomalies. In an external field of H = 70 kOe, there is a noticeable temperature
hysteresis
of magnetization at 50–90 K, and near T ≈ 50 K, the M(T) curves have a characteristic bending, which may be indicative of an additional magnetic transition. The ferromagnetic resonance spectra shows that, near 500 K, a magnetic phase transition occurs, which was previously thought to be a transition to the paramagnetic state. An analysis of the temperature dependence of the ferromagnetic resonance spectra shows that the magnetically ordered phase in ϵ-Fe2O3 exists up to about 800 K.
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2.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Gokhfeld D. M., Balaev D. A.
Заглавие
: Magnetization anisotropy in the textured Bi-2223 HTS in strong magnetic fields
Место публикации
: Phys. Solid State. - 2020. - Vol. 62, Is. 7. - P.1145-1149. - ISSN 10637834 (ISSN),
DOI
10.1134/S1063783420070069
Примечания
: Cited References: 32
Аннотация:
The origin of the low magnetization anisotropy of the textured bulk samples consisting of highly anisotropic (Bi,Pb)2Sr2Ca2Cu3Ox (Bi-2223) high-temperature superconductor crystallites has been investigated. It has been established that the observed anisotropy is determined by the disordering of Bi-2223 crystallites in the sample. The measured anisotropy of the textured sample makes it possible to determine the magnetic angle characterizing the ordering of crystallites.
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3.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Semenov S. V., Balaev D. A.
Заглавие
: Model of the behavior of a granular HTS in an external magnetic field: temperature evolution of the magnetoresistance
hysteresis
Место публикации
: Phys. Solid State. - 2020. - Vol. 62, Is. 7. - P.1136-1144. - ISSN 10637834 (ISSN),
DOI
10.1134/S1063783420070239
Примечания
: Cited References: 61. - The authors are grateful to D.M. Gokhfeld for discussion of the results. The measurements of the transport properties were performed in part on a PPMS-6000 facility at the Krasnoyarsk Territorial Center of Collective Use, Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences
Аннотация:
A model for describing the magnetoresistance behavior in a granular high-temperature superconductor (HTS) that has been developed in the last decade explains a fairly extraordinary form of the hysteretic R(H) dependences at T = const and their hysteretic features, including the local maximum, the negative magnetoresistance region, and the local minimum. In the framework of this model, the effective field Beff in the intergrain medium has been considered, which represents a superposition of the external field and the field induced by the magnetic moments of HTS grains. This field can be written in the form Beff(H) = H + 4παM(H), where M(H) is the experimental field dependence of the magnetization and α is the parameter of crowding of the magnetic induction lines in the intergrain medium. Therefore, the magnetoresistance is a function of not simply an external field, but also the “internal” effective field R(H) = f(Beff(H)). The magnetoresistance of the granular YBa2Cu3O7 – δ HTS has been investigated in a wide temperature range. The experimental hysteretic R(H) dependences obtained in the high -temperature range (77–90 K) are well explained using the developed model and the parameter α is 20–25. However, at a temperature of 4.2 K, no local extrema are observed, although the expression for Beff(H) predicts them and the parameter α somewhat increases (~30–35) at this temperature. An additional factor that must be taken into account in this model can be the redistribution of the microscopic current trajectories, which also affects the dissipation in the intergrain medium. At low temperatures under the strong magnetic flux compression (α ~ 30–35), the microscopic trajectories of the current Im can change and tunneling through the neighboring grain is preferred, but the angle between Im and Beff will be noticeably smaller than 90°, although the external (and effective) field direction is perpendicular to the macroscopic current direction.
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4.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Semenov S. V., Balaev D. A.
Заглавие
: Magnetoresistance
Hysteresis
Evolution in the Granular Y–Ba–Cu–O High-Temperature Superconductor in a Wide Temperature Range
Место публикации
: J. Supercond. Novel Magn. - 2019. - Vol. 32, Is. 8. - P.2409–2419. - ISSN 15571939 (ISSN) ,
DOI
10.1007/s10948-019-5043-2
Примечания
: Cited References: 55. - The work was supported by the Russian Science Foundation (Grant No. 17-72-10050).
Аннотация:
The temperature evolution of the magnetoresistance
hysteresis
in the granular YBa2Cu3O7-δ high-temperature (TC ≈ 92 K) superconductor has been investigated. The measurements have been performed in the high-temperature region (78–90 K) and at the liquid helium temperature (4.2 K). The results obtained have been analyzed using the developed model of the behavior of transport properties of a granular high-temperature superconductor in an external magnetic field. Within the discussed model, the dissipation of the grain boundary subsystem is determined by the intergrain spacing-averaged effective field Beff, which is a superposition of external field H and the field induced by the magnetic moments of superconducting grains. Such a consideration yields the expression Beff(H) = H − 4πM(H) α for the effective field in the intergrain medium, where M(H) is the experimental hysteretic dependence of magnetization and α is the parameter of magnetic flux crowding in the intergrain medium. Here, the magnetoresistance is assumed to be proportional to the absolute value of the effective field: R(H) ~ |Beff(H)|. Analysis of the experimental R(H) and M(H) dependences obtained under the same conditions for the investigated high-temperature superconductor sample showed that in the high-temperature region this parameter is α ≈ 25. At the low temperature (4.2 K), we may state that the degree of flux crowding increases and the estimated α value is ~ 50. The estimates made are indicative of the strong effect of flux compression in the intergrain medium on the magnetotransport properties of the investigated granular high-temperature superconductor system. Possible reasons for a discrepancy between the developed model concepts and experimentally observed low-temperature R(H)
hysteresis
are analyzed.
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5.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Dudnik A. I., Vnukova N. G., Drokin N. A., Bondarev V. S., Shestakov N. P., Tomashevich Y. V., Churilov G. N.
Заглавие
: Electrophysical properties of hydroxylated endohedral metallofullerene with gadolinium
Место публикации
: J. Phys. Chem. Solids. - 2019. - Vol. 135. - Ст.109094. - ISSN 00223697 (ISSN) ,
DOI
10.1016/j.jpcs.2019.109094
Примечания
: Cited References: 35. - The reported study was funded by RFBR according to the research project No 18-29-19003.
Аннотация:
The paper presents the results of experimental measurements of constitutive and electrophysical properties in hydroxylated endohedral metallofullerene with gadolinium sample. We extracted endohedral metallofullerene from carbon condensate, synthesized in high-frequency arc discharge plasma. Later hydroxyl groups were added. Via methods of infrared and x-ray photoelectronic spectroscopy, it was established that the molecules of hydroxylated endohedral metallofullerene have the Gd@C82Ox(OH)y, x + y=(40–42) composition. The method of measuring the electrical impedance in the frequency range from 100 Hz to 100 MHz shows that the resulting hydroxylated fullerene is an ion conductor. The measured frequency dependences of the dielectric permittivity and conductivity of hydroxylated fullerene are explained based on the assumption of an inhomogeneous distribution of electric charges in the material volume. Dielectric-
hysteresis
loops in the frequency range of 25 Hz–1 MHz and temperature range of 80–300 K, and volt-ampere characteristics were measured. The obtained results imply the appearance of residual polarization induced by the electric field in hydroxylated fullerene. However, the constant dipole moment is absent. © 2019
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6.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Aplesnin S. S., Kretinin V. V., Begisheva O. B.
Заглавие
: Magnetoelectric Effect in a Paramagnetic Region in Gd0.15Mn0.85Se
Коллективы
: Russian foundation for Basic ResearchRussian Foundation for Basic Research (RFBR); Government of the Krasnoyarsk region; Krasnoyarsk Regional Foundation for Science [18-42-240001, MK 591.2019.2, 3.5743.2017/6.7]
Место публикации
: Phys. Solid State. - 2019. - Vol. 61, Is. 8. - P.1379-1382. - ISSN 1063-7834,
DOI
10.1134/S1063783419080067. - ISSN 1090-6460(eISSN)
Примечания
: Cited References: 16. - This work was supported by the Russian foundation for Basic Research, the Government of the Krasnoyarsk region, and Krasnoyarsk Regional Foundation for Science in the framework of the scientific project no. 18-42-240001 "Inversion of the sign of components of the magnetoelectric tensor in temperature in neodymium-substituted bismuth ferrite-garnet films," grant MK 591.2019.2, and state task no. 3.5743.2017/6.7.
Предметные рубрики:
MULTIFERROICS
Аннотация:
The electric polarization in a zero magnetic field and in a magnetic field of 12 kOe is measured in a GdxMn1 – xSe solid solution in the percolation concentration region in the temperature range 80–380 K. For composition x = 0.15, the polarization
hysteresis
and the dependence of the remanent polarization on magnetic field and temperature are determined. The
hysteresis
is explained in the model of migration polarization and the magnetoelectric effect is explained in the Maxwell–Wagner model.
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7.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Komogortsev S. V., Balaev D. A., Krasikov A. A., Stolyar S. V., Yaroslavtsev R. N., Ladygina V. P., Iskhakov R. S.
Заглавие
: Magnetic
hysteresis
of blocked ferrihydrite nanoparticles
Место публикации
: AIP Adv. - 2021. - Vol. 11, Is. 1. - Ст.015329. - ISSN 21583226 (ISSN),
DOI
10.1063/9.0000111
Примечания
: Cited References: 23. - The magnetic measurements were partially carried out on the equipment of the Krasnoyarsk Regional Center for Collective Use, Krasnoyarsk Science Center, Siberian Branch, Russian Academy of Sciences. This study was supported by the Council of the President of the Russian Federation for State Support of Young Scientists and Leading Scientific Schools (project no. MK-1263.2020.3)
Аннотация:
Using minor
hysteresis
loops in the Stoner-Wohlfarth model allows describing the experimental behavior of the coercive force of minor
hysteresis
loops in ferrihydrite nanoparticles with a change in the field amplitude. The description allows estimating the parameters of the distribution of the magnetic anisotropy field in nanoparticles. The best agreement of the anisotropy fields estimated by different approaches is achieved for the assumption of uniaxial anisotropy in ferrihydrite nanoparticles.
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8.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Balaev D. A., Semenov S. V., Gokhfeld D. M.
Заглавие
: New evidence of interaction between grain and boundaries subsystems in granular high-temperature superconductors
Место публикации
: J. Supercond. Novel Magn. - 2021. - Vol. 34. Is. 4. - P.1067-1075. - ISSN 15571939 (ISSN),
DOI
10.1007/s10948-021-05812-2
Примечания
: Cited References: 62
Аннотация:
Granular high-temperature superconductors (HTSs) exhibit magnetotransport properties, including the clockwise magnetoresistance
hysteresis
. The
hysteresis
is explained by the concept of an effective field in the subsystem of grain boundaries, where the observed dissipation occurs. The effective field in the intergrain medium is determined by a superposition of the external field H and the field induced by the magnetic response of HTS grains. The magnetic flux compression in the intergrain medium provides an increase of the effective field. The magnetoresistance
hysteresis
of polycrystalline YBa2Cu3O7-δ has a bright feature: In a fairly wide external field range, the
hysteresis
width ΔH(H) is found to be almost linear, ΔH ≈ H. This behavior is considered to be universal over the entire temperature range corresponding to the superconducting state (the investigations have been carried out at temperatures of 77 K and 4.2 K). The analysis of the magnetoresistive and magnetic properties has shown that the upper boundary of the field range of the ΔH ≈ H regime is consistent with the field of complete penetration into HTS grains. This is indicative of the strong interrelation between the magnetotransport and magnetic properties of granular HTSs.
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9.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Pavlov A. V., Kveglis L. I., Saprykin D. N., Nasibullin R. T., Kalitova A. A., Velikanov D. A., Nemtsev I. V., Kantai N.
Заглавие
: Emergence of ferromagnetism in nanoparticles of BeTiO3 ceramic with the perovskite structure
Место публикации
: Inorg. Mater.: Appl. Res. - 2021. - Vol. 12, Is. 1. - P.88-93. - ISSN 20751133 (ISSN),
DOI
10.1134/S2075113321010330
Примечания
: Cited References: 21. - The part of the work involving calculations was supported by the Russian Science Foundation (grant no. 18-19-00268)
Аннотация:
Emergence of ferromagnetism and an increase in the electrical conductance of BeTiO3 beryllium ceramic with the perovskite structure were discovered experimentally. To explain the reason for appearance of the metallic properties, models are proposed, and calculations of the electronic structure of nanoclusters with different short-range order are performed.
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10.
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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11.
Вид документа
: Статья из сборника (однотомник)
Шифр издания
:
Автор(ы)
: Komogortsev S. V., Balaev D. A., Krasikov A. A., Stolyar S. V., Yaroslavtsev R. N., Iskhakov R. S.
Заглавие
: Magnetic
Hysteresis
of Blocked Ferrihydrite Nanoparticles
Коллективы
: Annual conference on мagnetism and мagnetic мaterials
Место публикации
: 65th Annual conference on мagnetism and мagnetic мaterials (MMM-2020): abstract book. - 2020. - Ст.C4-02. - P.74
Материалы конференции
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12.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Aplesnin S. S., Masyugin A. N., Volochaev M. N., Ishibashi T.
Заглавие
: Coexistence of the electric polarization and conductive current in the bismuth–neodymium ferrite garnet films
Место публикации
: J. Mater. Sci. Mater. Electron. - 2021. - Vol. 32. - P.3766-3781. - ISSN 09574522 (ISSN),
DOI
10.1007/s10854-020-05121-9
Примечания
: Cited References: 42
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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13.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Samardak A. S., Ognev A. V., Samardak A. Y., Stebliy E. V., Modin E. B., Chebotkevich L. A., Komogortsev S. V., Stancu A., Panahi-Danaei E., Fardi-Ilkhichy A., Nasirpouri F.
Заглавие
: Variation of magnetic anisotropy and temperature-dependent FORC probing of compositionally tuned Co-Ni alloy nanowires
Место публикации
: J. Alloys Compd. - 2018. - Vol. 732. - P.683-693. - ISSN 09258388 (ISSN),
DOI
10.1016/j.jallcom.2017.10.258
Примечания
: Cited References: 60. - This work was supported by the Russian Foundation for Basic Research (grant 16-02-01015 А), by the Russian Ministry of Education and Science under the state task (3.5178.2017/8.9), by Act 211 of the Government of the Russian Federation (contract № 02.A03.21.0011) and by the Brain Pool Program (172S-2-3-1928) through the Korean Federation of Science and Technology Societies (KOFST) funded by the Ministry of Science, ICT and Future Planning. Financial support from Iranian Nanotechnology Initiative council is also acknowledged.
Ключевые слова
(''Своб.индексиров.''): coercive force--magnetic anisotropy--magnetic
hysteresis
--binary alloy nanowires--alumina template--electrodeposition--first order reversal curves--stochastic magnetic domain--random anisotropy model
Аннотация:
The magnetic microstructure of Co-Ni binary alloy nanowires electrodeposited with controlled composition into nanoporous aluminum oxide templates can be represented as an ensemble of stochastic magnetic domains, whose size is determined by the magnetic correlation length. Using a method based on the approaching of magnetization to saturation, we defined the dimension of regions with magnetic orientation coherency as the stochastic domain size. Based on the experimental measurements of magnetization curves near saturation and first order reversal curves (FORC), we described a relationship between the macroscopic and microscopic parameters of the nanowires depending on the crystal structure observed by high-resolution transmission electron microscopy in terms of the random anisotropy model. The alloy composition strongly determines the crystal structure, in particular, the grain size and hcp/fcc phase distribution, and influences the effective magnetic anisotropy energy providing the direction of easy magnetization in the nanowire arrays. The characterization of Co-Ni arrays by FORC method at room and low temperatures revealed the transformation of magnetic behavior and certain contributions to the energy of the effective magnetic anisotropy.
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14.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Semenov S. V., Balaev D. A.
Заглавие
: Temperature behavior of the magnetoresistance
hysteresis
in a granular high-temperature superconductor: Magnetic flux compression in the intergrain medium
Место публикации
: Physica C. - 2018. - Vol. 550. - P.19-26. - ISSN 09214534 (ISSN),
DOI
10.1016/j.physc.2018.04.005
Примечания
: Cited References: 56. - The work was supported by the Russian Science Foundation (Grant No. 17-72-10050 ).
Ключевые слова
(''Своб.индексиров.''): barium compounds--copper compounds--grain boundaries--
hysteresis
--magnetic flux--magnetic moments--magnetization--magnetoresistance--yttrium barium copper oxides
Аннотация:
Granular high-temperature superconductors (HTSs) are characterized by the hysteretic behavior of magnetoresistance. This phenomenon is attributed to the effective field in the intergrain medium of a granular HTS. At the grain boundaries, which are, in fact, weak Josephson couplings, the dissipation is observed. The effective field in the intergrain medium is a superposition of the external field and the field induced by magnetic moments of HTS grains. Meanwhile, analysis of the field width of the R(H) magnetoresistance
hysteresis
ΔH = Hdec − Hinc at Hdec = const, where Hinc and Hdec are increasing and decreasing branches of the R(H) hysteretic dependence, shows that the effective field in the intergrain medium exceeds by far both the external field and the field induced by magnetic moments of HTS grains. This situation suggests the magnetic flux compression in the intergrain medium because of the small length of grain boundaries, which amounts to ∼1 nm, i.e., is comparable with the coherence length and corresponds to Josephson tunneling in HTS materials. In this work, using the previously developed approach, we examine experimental data on the magnetoresistance and magnetization
hysteresis
in the granular YBa2Cu3O7 HTS compound in the range from 77 K to the critical temperature. According to the results obtained, the degree of magnetic flux compression determined by the parameter α in the expression for the effective field Beff(H) = H − 4π M(H) α in the intergrain medium remains constant over the investigated temperature range. All the features of the observed evolution of the R(H) hysteretic dependences are explained well within the proposed approach when the expression for Beff(H) contains the experimental M(H) magnetization data and the parameter α of about 20–25. The latter is indicative of the dominant effect of magnetic flux compression in the intergrain medium on the transport properties of granular HTS materials.
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15.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Gokhfeld D. M.
Заглавие
: Analysis of superconductor magnetization
hysteresis
Место публикации
: J. Sib. Fed. Univ. Math. Phys. - 2018. - Vol. 11, Is. 2. - P.219-221. - ISSN 19971397 (ISSN),
DOI
10.17516/1997-1397-2018-11-2-219-221; Журн. СФУ. Сер. "Математика и физика"
Примечания
: Cited References: 9
Ключевые слова
(''Своб.индексиров.''): 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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16.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Balaev D. A., Semenov S. V., Pochekutov M. A.
Заглавие
: Anisotropy of the magnetoresistance
hysteresis
in the granular superconductor Y-Ba-Cu-O at different magnetic-field and transport-current orientations
Место публикации
: J. Appl. Phys.: American Institute of Physics, 2017. - Vol. 122, Is. 12. - Ст.123902. - ISSN 00218979 (ISSN),
DOI
10.1063/1.4986253
Примечания
: 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.
Ключевые слова
(''Своб.индексиров.''): 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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17.
Вид документа
: Статья из сборника (однотомник)
Шифр издания
:
Автор(ы)
: Aplesnin S. S., Panasevich A. M., Sitnikov M. N., Khar'kov A. M.
Заглавие
: Magnetocapacitance and
hysteresis
of electricalpolarization in GDxMn1-xSe
Коллективы
: Moscow International Symposium on Magnetism, Московский государственный университет им. М.В. Ломоносова, Российский фонд фундаментальных исследований
Место публикации
: Moscow International Symposium on Magnetism (MISM-2017): 1-7 July 2017 : book of abstracts. - 2017. - Ст.4OR-F-11. - P.666 (Шифр 29916280)
РИНЦ
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Материалы конференции
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18.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Balaev D. A., Popkov S. I., Krasikov A. A., Balaev A. D., Dubrovskiy A. A., Stolyar S. V., Yaroslavtsev R. N., Ladygina V. P., Iskhakov R. S.
Заглавие
: Temperature behavior of the antiferromagnetic susceptibility of nanoferrihydrite from the measurements of the magnetization curves in fields of up to 250 kOe
Коллективы
: Russian Foundation for Basic Research; Government of Krasnoyarsk region; Krasnoyarsk Regional Foundation of Supporting the Scientific and Scientific-Engineering Activity in the framework of the scientific projects [17-42-240138, 17-43-240527]
Место публикации
: Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2017. - Vol. 59, Is. 10. - P.1940-1946. - ISSN 1063-7834,
DOI
10.1134/S1063783417100031. - ISSN 1090-6460(eISSN)
Примечания
: Cited References:45. - This work was supported by the Russian Foundation for Basic Research, the Government of Krasnoyarsk region, the Krasnoyarsk Regional Foundation of Supporting the Scientific and Scientific-Engineering Activity in the framework of the scientific projects nos. 17-42-240138 and 17-43-240527.
Предметные рубрики:
FERRIHYDRITE NANOPARTICLES
BACTERIAL FERRIHYDRITE
HYSTERESIS
Аннотация:
The cross-breeding problem of the temperature dependence of the antiferromagnetic susceptibility of ferrihydrite nanoparticles is considered. Iron ions Fe3+ in ferrihydrite are ordered antiferromagnetically; however, the existence of defects on the surface and in the bulk of nanoparticles induces a noncompensated magnetic moment that leads to a typical superparamagnetic behavior of ensemble of the nanoparticles with a characteristic blocking temperature. In an unblocked state, magnetization curves of such objects are described as a superposition of the Langevin function and the linear-in-field contribution of the antiferromagnetic “core” of the nanoparticles. According to many studies of the magnetization curves performed on ferrihydrite (and related ferritin) nanoparticles in fields to 60 kOe, dependence χAF(T) decreases as temperature increases, which was related before to the superantiferromagnetism effect. As the magnetic field range increases to 250 kOe, the values of χAF obtained from an analysis of the magnetization curves become lower in magnitude; however, the character of the temperature evolution of χAF is changed: now, dependence χAF(T) is an increasing function. The latter is typical for a system of AF particles with random orientation of the crystallographic axes. To correctly determine the antiferromagnetic susceptibility of AF nanoparticles (at least, ferrihydrite) and to search for effects related to the superantiferromagnetism effect, it is necessary to use in experiments the range of magnetic field significantly higher than that the standard value 60 kOe used in most experiments. The study of the temperature evolution of the magnetization curves shows that the observed crossover is due to the existence of small magnetic moments in the samples.
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19.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Wu, Po-Chang, Chen, Hsin-Li, Rudakova, Natalya V., Timofeev I. V., Zyryanov V. Ya., Lee, Wei
Заглавие
: Electro-optical and dielectric properties of polymer-stabilized blue phase liquid crystal impregnated with a fluorine-containing compound
Коллективы
: Ministry of Science and Technology, Taiwan [104-2112-M-009-008-MY3, 106-2923-M-009-002-MY3]; Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund [16-42-240704, 17-42-240464]
Место публикации
: J. Mol. Liq. - 2018. - Vol. 267. - P.138-143. - ISSN 0167-7322,
DOI
10.1016/j.molliq.2017.12.062. - ISSN 1873-3166(eISSN)
Примечания
: Cited References: 47. - The authors are indebted to Prof. Mon-Juan Lee of Chang-Jung Christian University for valuable discussions on photopolymerization. This work was financially supported by the Ministry of Science and Technology, Taiwan, through Grant Nos. 104-2112-M-009-008-MY3 and 106-2923-M-009-002-MY3, and by the Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund to the research projects 16-42-240704 and 17-42-240464.
Предметные рубрики:
HYSTERESIS
TEMPERATURE
MONOMERS
Ключевые слова
(''Своб.индексиров.''): polymer-stabilized blue phase--liquid crystal--fluorine-containing--compound--operating voltage--ionic effect
Аннотация:
The effects of a fluorine-containing compound (4,4′-difluorobenzophenone; DF) on the electro-optical and dielectric properties of polymer-stabilized blue phase (PSBP) liquid crystals were investigated. When a PSBP cell was driven by an in-plane electric field, the addition of DF up to 2.7 wt% effectively reduced the operation voltage by ~ 30%. Further inspection by dielectric spectroscopy indicated that the ionic concentration in PSBP decreased with increasing loading of DF. This finding can be ascribed to the complexation of impurity ions near the ketone group and carbon–fluorine bonds of the DF compound that restrained the ion transport after photopolymerization. As a result, the DF compound can be regarded as a superior ion-suppressor, enabling the reduction in the ionic effect and, in turn, the promotion of the electro-optical response of a PSBP.
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20.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Komogortsev S. V., Fel'k V. A., Li O. A.
Заглавие
: The magnetic dipole-dipole interaction effect on the magnetic
hysteresis
at zero temperature in nanoparticles randomly dispersed within a plane
Место публикации
: J. Magn. Magn. Mater. - 2019. - Vol. 473. - P.410-415. - ISSN 03048853 (ISSN) ,
DOI
10.1016/j.jmmm.2018.10.091
Примечания
: Cited References: 58. - This work was supported by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund to the research project № 18-42-240006.
Ключевые слова
(''Своб.индексиров.''): micromagnetic simulation--magnetic
hysteresis
--magnetic nanoparticles--dipole-dipole interaction
Аннотация:
The dipole-dipole interaction effect on the magnetic
hysteresis
of nanoparticles randomly dispersed within a plane is studied by micromagnetic simulation. The dependence of the coercive field with the concentration of nanoparticles varies from nonlinear and monotonic to non-monotonic dependence with a maximum at a certain concentration. It happens when the ratio of the magnetic anisotropy constant to the maximal dipole energy changes from value much larger than 1 to the value much less than unity.
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