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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Iskhakov R. S., Kuzovnikova L. A., Komogortsev S. V., Denisova E. A., Balaev A. D., Mal'tsev V. K., Bondarenko G. N.
Заглавие : Magnetostructural Investigation of Ball-Milled Cobalt-Copper Alloy
Место публикации : Phys. Met. Metallogr. - Vol. 102, Suppl. 1, Chapter 11. - р.S64-S66. - DOI 10.1134/S0031918X0614016X
Примечания : Библиогр.: 6. - Russian Foundation for Basic Research (project no. 04-02-16230)
Аннотация: In this work we investigate a metastable inhomogeneous Co–Cu alloy produced by mechanical alloying. We use both conventional structural method (X-ray diffraction) and magnetic measurements of M(T) and M(H) dependences to obtain additional information about the process of mechanical alloying.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Абрамова, Галина Михайловна, Петраковский, Герман Антонович, Боем М., Шимчак Р., Великанов, Дмитрий Анатольевич, Балаев, Александр Дмитриевич, Соколов В.
Заглавие : Магнитные свойства твердых растворов моносульфида марганца
Коллективы : "Фазовые превращения в твердых растворах и сплавах", Международный междисциплинарный симпозиум
Место публикации : XI Междисциплинарный международный симпозиум "Фазовые превращения в твердых растворах и сплавах". OMA-11: сборник трудов : 10-15 сентября 2008, п. Лоо, Сочи. - Т. 2. - С. 117-120
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Krasikov A. A., Balaev D. A., Balaev A. D., Stolyar S. V., Yaroslavtsev R. N., Iskhakov R. S.
Заглавие : Separating the contributions of the magnetic subsystems in antiferromagnetic ferrihydrite nanoparticles by analyzing the magnetization in fields of up to 250 kOe
Колич.характеристики :8 с
Место публикации : J. Magn. Magn. Mater. - 2024. - Vol. 592. - Ст.171781. - ISSN 03048853 (ISSN), DOI 10.1016/j.jmmm.2024.171781. - ISSN 18734766 (eISSN)
Примечания : Cited References: 84. - This study was supported by his work was supported by the Russian Science Foundation, project no. 22–72-00134Authors thank to D.A. Velikanov, S.V. Komogortsev for fruitful discussions
Аннотация: Contributions of different magnetic subsystems formed in the systems of synthetic ferrihydrite nanoparticles (characterized previously) with an average size of ˂d˃ ≈ 2.7 nm coated with polysaccharide arabinogalactan in different degrees have been separated by measuring the dependences of their magnetization M on magnetic field H of up to 250 kOe on vibrating sample and pulsed magnetometers. The use of a wide measuring magnetic field range has been dictated by the ambiguity in identifying a linear M(H) portion for such antiferromagnetic nanoparticle systems within the conventional field range of 60–90 kOe. The thorough analysis of the magnetization curves in the temperature range of 100–250 K has allowed the verification of the contributions of (i) uncompensated magnetic moments µun in the superparamagnetic subsystem, (ii) the subsystem of surface spins with the paramagnetic behavior, and (iii) the antiferromagnetic susceptibility of the antiferromagnetically ordered ferrihydrite particle core. As a result, a model of the magnetic state of ferrihydrite nanoparticles has been proposed and the numbers of spins corresponding to magnetic subsystems (i)–(iii) have been estimated. An average magnetic moment μun of ∼ 145 μB (μB is the Bohr magneton) per particle corresponds approximately to 30 decompensated spins of iron atoms in a particle (about 3 % of all iron atoms), which, according to the Néel’s hypothesis μun ∼ ˂d˃3/2, are localized both on the surface and in the bulk of an antiferromagnetically ordered particle. The fraction of free (paramagnetic) spins is minimal in the sample without arabinogalactan coating of the nanoparticle surface (7 %) and is attained 20 % of all iron atoms in the sample with the highest degree of spatial separation of particles. According to this estimation, paramagnetic spins are located mainly on the edges and protruding areas of particles. Most magnetic moments of iron atoms are ordered antiferromagnetically and the corresponding magnetic susceptibility of this subsystem behaves as in an antiferromagnet with the randomly distributed crystallographic axes, i.e., increases with temperature.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Krasikov A. A., Knyazev Yu. V., Balaev D. A., Stolyar S. V., Ladygina V. P., Balaev A. D., Iskhakov R. S.
Заглавие : Magnetic interparticle interactions and superparamagnetic blocking of powder systems of biogenic ferrihydrite nanoparticles
Колич.характеристики :11 с
Место публикации : J. Exp. Theor. Phys. - 2023. - Vol. 137, Is. 6. - P.903-913. - ISSN 10637761 (ISSN), DOI 10.1134/S1063776123120075. - ISSN 10906509 (eISSN)
Примечания : Cited References: 58. - This study was supported by the Russian Science Foundation, project no. 22-72-00134
Аннотация: The magnetic-field dependence of the superparamagnetic-blocking temperature TB of systems of antiferromagnetically ordered ferrihydrite nanoparticles has been investigated and analyzed. We studied two powder systems of nanoparticles: particles of “biogenic” ferrihydrite (with an average size of 2.7 nm), released as a result of vital functions of bacteria and coated with a thin organic shell, and particles of biogenic ferrihydrite subjected to low-temperature annealing, which cause an increase in the average particle size (to 3.8 nm) and burning out of the organic shell. The character of the temperature dependences of magnetization, measured after cooling in a weak field, as well as the shape of the obtained dependences TB(H), demonstrate peculiar features, indicating the influence of magnetic interparticle interactions. A detailed analysis of the dependences TB(H) within the random magnetic anisotropy model made it possible to estimate quantitatively the intensity of magnetic particle–particle interactions and determine the magnetic anisotropy constants of individual ferrihydrite particles.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pankrats A. I., Balaev A. D., Skorobogatov S. A., Krasikov A. A., Kolkov M. I., Zharkov S. M., Zeer G. M., Pavlovskii M. S., Balaev D. A.
Заглавие : Inclined magnetic structures and magnetic phase diagrams for the Pb2Fe2−xMnxGe2O9 (x = 0.16) single crystal
Место публикации : J. Magn. Magn. Mater. - 2022. - Vol. 563. - Ст.170021. - ISSN 03048853 (ISSN), DOI 10.1016/j.jmmm.2022.170021
Примечания : Cited References: 24. - This study was supported by the Russian Foundation for Basic Research, the Government of the Krasnoyarsk Territory, and the Krasnoyarsk Territorial Foundation for Support of Scientific and R&D Activities, project no. 20-42-2 40006 “Synthesis and Study of Pb 2+ and Bi 3+ -Containing Oxide Single Crystals with Partial Substitution in One of the Subsystems: Magnetic Structures and Magnetodielectric Effect”. The SEM and EDS studies were carried out at the Joint Scientific Center of the Siberian Federal University within the state assignment (#FSRZ-2020-0011) of the Ministry of Science and Higher Education of the Russian Federation
Аннотация: Single crystals of the Pb2Fe2?xMnxGe2O9 (x = 0.16) antiferromagnet have been grown. Using the specific heat measurements, a Neel temperature of TN = (42.0 ± 0.5) K for the synthesized crystals has been found. It has been shown using the magnetic measurements that, due to the competition between the magnetoanisotropic contributions of the iron and manganese subsystems in the crystals, near a temperature of Tc = 22 K, a spontaneous spin-reorientation transition occurs, the temperature of which in an applied magnetic field changes with the field value and orientation relative to the rhombic axes of the crystal. Based on the analysis of the temperature and field dependences of the magnetization obtained at different orientations of the magnetic field, it has been established that, below Tc, an inclined magnetic structure is formed in the crystal. The antiferromagnetic vector of the inclined structure rotates smoothly in the rhombic bc plane with increasing temperature from a direction close to the b axis at T = 4.2 K and tends to the rhombic c axis at T = Tc. The rotation of the antiferromagnetic vector occurs also at fixed temperatures T < Tc with increasing magnetic field. In the temperature range of Tc < T < TN, the antiferromagnetic vector is oriented along the rhombic c axis. Magnetic phase diagrams of states have been built for different magnetic field orientations relative to the rhombic axes of the crystal. The richest phase diagram is shown to correspond to the orientation H||c and contains, along with the above-listed states, one more inclined phase, in which the antiferromagnetic vector rotates toward the rhombic a axis direction with a change in temperature or magnetic field.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pankrats A. I., Kolkov M. I., Balaev A. D., Freydman A. L., Vasiliev A. D., Balaev D. A.
Заглавие : Comparative study of the magnetic phase diagrams and spin-flop-driven magnetodielectric responses of the pure and Mn3+-doped Pb2Fe2Ge2O9 single crystals
Место публикации : J. Magn. Magn. Mater. - 2021. - Vol. 534. - Ст.168023. - ISSN 03048853 (ISSN), DOI 10.1016/j.jmmm.2021.168023
Примечания : Cited References: 21. - This study was supported by the Russian Foundation for Basic Research, the Government of the Krasnoyarsk Territory, and the Krasnoyarsk Territorial Foundation for Support of Scientific and R&D Activities, project no. 18-42-240008 “Effect of the Magnetic Structure on the Magnetodielectric Properties of Oxide Crystals Containing Stereoactive Pb 2+ and Bi 3+ Ions”
Аннотация: The Pb2Fe2-xMnxGe2O9 (x = 0.43) orthorhombic antiferromagnet single crystals have been synthesized by a modified pseudo-flux technique and their magnetic and magnetodielectric properties have been investigated. It has been established that partial substitution of highly anisotropic Mn3+ ions for iron ones significantly affects the magnetic structure of the crystal. Under magnetization of the crystal along the rhombic b and c axes, magnetization jumps have been detected, which are indicative of the occurrence of orientational transitions identified as first-order ones. No weak ferromagnetism characteristic of the pure crystal in the rhombic a axis direction has been detected. The field dependences of the magnetization for the pure and Mn-doped crystals have been analyzed using the thermodynamic potential that takes into account the crystal symmetry. It has been shown that, in the Mn-substituted crystal, the antiferromagnetic vector in the ground state is parallel to the rhombic b axis; in this state, weak ferromagnetism has not been observed. Under magnetization along the b axis, a conventional spin-flop transition occurs. The orientational transition under magnetization along the c axis has been attributed to the reorientation of the antiferromagnetic vector relative to the a axis with the simultaneous occurrence of a weak ferromagnetic moment along the c axis. Magnetic phase diagrams of the Mn-doped crystal for the magnetic fields H||b and H||c have been built. In the Mn-doped crystal, at E||c and H||c, the orientational transition-induced magnetodielectric response jump has been detected, which is higher than the jumps observed for the undoped crystal by a factor of 3. The magnetodielectric properties of the pure and Mn-doped crystals have been analyzed using their magnetic phase diagrams.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pankrats A. I., Kolkov M. I., Balaev A. D., Shabanov A. V., Vasiliev A. D.
Заглавие : Forming a ferrimagnetic-like structure in the PbMn1−xFexBO4 (x ≈ 0.1) single crystal upon partial substitution
Место публикации : J. Magn. Magn. Mater. - 2020. - Vol. 497. - Ст.165997. - ISSN 03048853 (ISSN), DOI 10.1016/j.jmmm.2019.165997
Примечания : Cited References: 25. - The authors are grateful to S. Nikitin for help in the specific heat measurements in a magnetic field and S. Martynov for fruitful discussions. This study was funded by RFBR and the Government of Krasnoyarsk Territory , Krasnoyarsk Regional Fund of Science , to the research project no. 18-42-240008 “Effect of Magnetic Structure on the Magnetodielectric Properties of Oxide Crystals Containing Stereoactive Ions Pb 2+ and Bi 3+”.
Аннотация: The PbMn1−xFexBO4 (x ≈ 0.1) orthoborate single crystals have been grown for the first time by spontaneous crystallization and their magnetic and resonance properties and specific heat have been examined. It has been established that partial substitution of iron ions for manganese ones leads to an increase in the Curie temperature to 34.2 K from its value of 30.3 K in the unsubstituted crystal, enhances the magnetic anisotropy, and reduces the saturation magnetization. The magnetization drop is explained in the framework of the model of a ferrimagnetic-like structure, in which the magnetic moments of iron and manganese ions form ferromagnetic subsystems coupled by the antiferromagnetic exchange. It has been found that under magnetization along the rhombic b axis the magnetic moments switch stepwise to the magnetic field direction in a certain critical field. The spin-reorientation transition is the first-order one. This feature of the crystal magnetization does not allow the experimental ferromagnetic resonance frequency-field dependence for the rhombic b axis to be described using the calculation for a simple rhombic ferromagnet. It has been established that the increase in the magnetic anisotropy of the crystal upon substitution leads to an increase in the energy gap in the ferromagnetic resonance spectrum to 121.5 GHz at T = 4.2 K.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Skorobogatov S. A., Nikitin S. E., Shaykhutdinov K. A., Balaev A. D., Terentjev K. Yu., Ehlers G., Sala G., Pomjakushina, E., V, Conder K., Podlesnyak A.
Заглавие : Low-temperature spin dynamics in the TmFeO3 orthoferrite with a non-Kramers ion
Коллективы : International Max Planck Research School for Chemistry and Physics of Quantum Materials (IMPRS-CPQM)
Место публикации : Phys. Rev. B. - 2020. - Vol. 101, Is. 1. - Ст.014432. - ISSN 2469-9950, DOI 10.1103/PhysRevB.101.014432. - ISSN 2469-9969(eISSN)
Примечания : Cited References: 41. - We thank A. Sukhanov for stimulating discussions and D. Abernathy for support with data acquisition. This research used resources at the High Flux Isotope Reactor and Spallation Neutron Source, a DOE Office of Science User Facility operated by Oak Ridge National Laboratory. S.E.N. acknowledges support from the International Max Planck Research School for Chemistry and Physics of Quantum Materials (IMPRS-CPQM). Laue x-ray diffraction measurements were conducted at the Center for Nanophase Materials Sciences (CNMS) (CNMS2019-R18) at Oak Ridge National Laboratory (ORNL), which is a DOE Office of Science User Facility
Предметные рубрики: NEUTRON-SCATTERING
REORIENTATION
VISUALIZATION
EXCITATIONS
SOFTWARE
Аннотация: We investigate the magnetic dynamics of the orthorhombic perovskite TmFeO3 at low temperatures, below the spin reorientation transition at TSR≈80 K, by means of time-of-flight neutron spectroscopy. We find that the magnetic excitation spectrum combines two emergent collective modes associated with different magnetic sublattices. The Fe subsystem orders below TN∼632 K into a canted antiferromagnetic structure and exhibits sharp, high-energy magnon excitations. We describe them using linear spin-wave theory, and reveal a pronounced anisotropy between in- and out-of-plane exchange interactions, which was mainly neglected in previous reports on the spin dynamics in orthoferrites. At lower energies, we find two crystalline electrical field (CEF) excitations of Tm3+ ions at energies of ∼2 and 5 meV. In contrast to the sister compound YbFeO3, where the Yb3+ ions form quasi-one-dimensional chains along the c axis, the Tm excitations show dispersion along both directions in the (0KL) scattering plane. Analysis of the neutron scattering polarization factor reveals a longitudinal polarization of the 2 meV excitation. To evaluate the effect of the CEF on the Tm3+ ions, we perform point-charge model calculations, and their results quantitatively capture the main features of Tm single-ion physics, such as energies, intensities, and polarization of the CEF transitions, and the type of magnetic anisotropy.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Balaev D. A., Krasikov A. A., Balaev A. D., Stolyar S. V., Ladygina V. P., Iskhakov R. S.
Заглавие : Features of relaxation of the remanent magnetization of antiferromagnetic nanoparticles by the example of ferrihydrite
Место публикации : Phys. Solid State. - 2020. - Vol. 62, Is. 7. - P.1172-1178. - ISSN 10637834 (ISSN), DOI 10.1134/S1063783420070033
Примечания : Cited References: 53
Аннотация: The relaxation of the remanent magnetization of antiferromagnetically ordered ferrihydrite nanoparticles at the exchange bias effect implemented in these systems has been investigated. The magnetization relaxation depends logarithmically on time, which is typical of the thermally activated hoppings of particle magnetic moments through the potential barriers caused by the magnetic anisotropy. The barrier energy obtained by processing of the remanent magnetization relaxation data under the field cooling conditions significantly exceeds the barrier energy under standard (zero field cooling) conditions. The observed difference points out the possibility of using the remanent magnetization relaxation to analyze the mechanisms responsible for the exchange bias effect in antiferromagnetic nanoparticles and measure the parameters of the exchange coupling of magnetic subsystems in such objects.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Balaev D. A., Balaev A. D.
Заглавие : Tunnel Conductivity and Tunnel Magnetoresistance of the Fe-SiO Films: Interplay of the Magnetotransport and Magnetic Properties
Место публикации : Phys. Solid State. - 2019. - Vol. 61, Is. 7. - P.1203-1210. - ISSN 1063-7834, DOI 10.1134/S1063783419070047. - ISSN 1090-6460(eISSN)
Примечания : Cited References: 48
Предметные рубрики: GIANT MAGNETORESISTANCE
GRANULAR FILMS
TEMPERATURE
TRANSPORT
Аннотация: The electrical properties of a system of nanogranular amorphous Fe–SiO films with a SiO concentration between 0 and 92 vol % have been investigated. The samples with a low SiO content are characterized by the metal-type conductivity. With an increase in the dielectric content x in the films, the concentration transition from the metal to tunneling conductivity occurs at x ≈ 0.6. At the same concentration, the ferromagnet–superparamagnet transition is observed, which was previously investigated by the magnetic method. The temperature dependences of the electrical resistivity ρ(T) for the compositions corresponding to the dielectric region obey the law ρ(T) ~ exp(2(C/kT)1/2), which is typical of the tunneling conductivity. The estimation of the metal grain sizes from the tunneling activation energy C has shown good agreement with the sizes obtained previously by analyzing the magnetic properties. In the dielectric region of the compositions, the giant magnetoresistive effect attaining 25% at low temperatures has been obtained.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Semenov S. V., Balaev A. D., Balaev D. A.
Заглавие : Dissipation in granular high-temperature superconductors: New approach to describing the magnetoresistance hysteresis and the resistive transition in external magnetic fields
Коллективы : Russian Science Foundation [17-72-10050]
Место публикации : J. Appl. Phys. - 2019. - Vol. 125, Is. 3. - Ст.033903. - ISSN 0021-8979, DOI 10.1063/1.5066602. - ISSN 1089-7550(eISSN)
Примечания : 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.
Предметные 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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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pankrats A. I., Balaev D. A., Nikitin S. E., Freydman A. L., Krasikov A. A., Balaev A. D., Popkov S. I., Kolkov M. I.
Заглавие : Magnetic and thermodynamic properties and spin-flop-driven magnetodielectric response of the antiferromagnetic Pb2Fe2Ge2O9 single crystals
Коллективы : Russian Foundation for Basic Research [16-02-00563]; RFBR; Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science [18-42-240008]; International Max Planck Research School for Chemistry and Physics of Quantum Materials (IMPRS-CPQM)
Место публикации : J. Magn. Magn. Mater. - 2019. - Vol. 479. - P.114-120. - ISSN 0304-8853, DOI 10.1016/j.jmmm.2019.02.026. - ISSN 1873-4766(eISSN)
Примечания : Cited References: 23. - This study was supported by the Russian Foundation for Basic Research, project no. 16-02-00563; the reported study was also funded by RFBR and the Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science, to the research project no. 18-42-240008 "Effect of magnetic structure on the magnetodielectric properties of oxide crystals containing stereoactive ions Pb2+ and Bi3+". S.E.N. acknowledges the support of the International Max Planck Research School for Chemistry and Physics of Quantum Materials (IMPRS-CPQM).
Предметные рубрики: FERROMAGNETISM
TRANSITION
Аннотация: Orthorhombic Pb2Fe2Ge2O9 antiferromagnetic single crystals have been synthesized by a modified pseudo-flux technique and their magnetic, thermodynamic, and magnetodielectric properties have been investigated. It has been found that, below the Ned temperature (45.2 K), iron moments are arranged in a canted antiferromagnetic structure with a weak ferromagnetic moment parallel to the a axis. According to the specific heat measurement data, the T-N value remains invariable in applied magnetic fields of up to 50 kOe within the experimental accuracy. The magnetic entropy in the investigated crystals attains 2Rln(2S + 1) right above T-N, which is indicative of a purely magnetic nature of the transition. It has been shown that the weak ferromagnetic moment is induced by the interplay between the single-ion anisotropy and antisymmetric Dzyaloshinskii-Moriya exchange interaction, with the latter contribution being dominant. It has been established from the angular dependences of the magnetization in three orthorhombic planes that the symmetries of the magnetic and crystal structure are identical. The magnetodielectric properties of the Pb2Fe2Ge2O9 single crystals have been studied at different mutual orientations of the electric and magnetic fields. The most prominent anomalies have been observed in the vicinity of the spin-flop transition in a magnetic field applied along the c axis.
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13.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Semenov S. V., Balaev A. D., Balaev D. A.
Заглавие : New approach to describing dissipation in granular HTSs
Коллективы : Российская академия наук, Уральское отделение РАН, Институт физики металлов им. М. Н. Михеева Уральского отделения РАН, Уральский федеральный университет им. первого Президента России Б.Н. Ельцина, Российский фонд фундаментальных исследований, Euro-Asian Symposium "Trends in MAGnetism", "Trends in MAGnetism", Euro-Asian Symposium
Место публикации : Euro-asian symposium "Trends in magnetism" (EASTMAG-2019): Book of abstracts/ чл. конс. ком.: S. G. Ovchinnikov, N. V. Volkov [et al.] ; чл. прогр. ком. D. M. Dzebisashvili [et al.]. - 2019. - Vol. 2. - Ст.I.P13. - P.159. - ISBN 978-5-9500855-7-4 (Шифр В33/E12-125657784)
Примечания : Cited References: 4. - The work was supported by the Russian Science Foundation (Grant No. 17-72-10050)
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14.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Pankrats A. I., Balaev D. A., Nikitin S. E., Freydman A. L., Krasikov A. A., Balaev A. D., Popkov S. I., Kolkov M. I.
Заглавие : Magnetic and thermodynamic properties and spin-flop-driven magnetodielectric response of the antiferromagnetic Pb2Fe2Ge2O9 single crystals
Коллективы : Российская академия наук, Уральское отделение РАН, Институт физики металлов им. М. Н. Михеева Уральского отделения РАН, Уральский федеральный университет им. первого Президента России Б.Н. Ельцина, Российский фонд фундаментальных исследований, Euro-Asian Symposium "Trends in MAGnetism", "Trends in MAGnetism", Euro-Asian Symposium
Место публикации : Euro-asian symposium "Trends in magnetism" (EASTMAG-2019): Book of abstracts/ чл. конс. ком.: S. G. Ovchinnikov, N. V. Volkov [et al.] ; чл. прогр. ком. D. M. Dzebisashvili [et al.]. - 2019. - Vol. 2. - Ст.K.O3. - P.301-302. - ISBN 978-5-9500855-7-4 (Шифр В33/E12-125657784)
Примечания : Cited References: 4. - The study was funded by RFBR and the Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science, to the research project no. 18-42-240008 ”Effect of magnetic structure on the magnetodielectric properties of oxide crystals containing stereoactive ions Pb2+ and Bi3+”
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Popkov S. I., Krasikov A. A., Dubrovskiy A. A., Volochaev M. N., Kirillov V. L., Martyanov O. N., Balaev A. D.
Заглавие : Size effects in the formation of an uncompensated ferromagnetic moment in NiO nanoparticles
Коллективы : Ministry of Science and Higher Education of the Russian Federation; Russian Foundation for Basic Research, Government of the Krasnoyarsk Territory [18-42-240012]; Krasnoyarsk Territorial Foundation [18-42-240012]
Место публикации : J. Appl. Phys. - 2019. - Vol. 126, Is. 10. - Ст.103904. - ISSN 0021-8979, DOI 10.1063/1.5109054. - ISSN 1089-7550(eISSN)
Примечания : Cited References: 54. - This study was supported by the Ministry of Science and Higher Education of the Russian Federation and by the Russian Foundation for Basic Research, Government of the Krasnoyarsk Territory, and Krasnoyarsk Territorial Foundation for Support of Scientific and R&D Activities, project: "Magnetic Reversal of Magnetic Nanoparticles in Strong Pulsed Magnetic Fields-A New Approach to the Study of Dynamic Effects Associated with the Magnetization of Magnetic Nanoparticles," Project No. 18-42-240012.
Предметные рубрики: MAGNETIC-PROPERTIES
TEMPERATURE
SUSCEPTIBILITY
NANOFERRIHYDRITE
Аннотация: The magnetic properties of samples of NiO nanoparticles with average sizes of 23, 8.5, and 4.5 nm were investigated. Using the magnetization curves measured in strong (up to 250 kOe) pulsed magnetic fields, the contributions of the free spin and ferromagnetic subsystems were extracted. It has been found that the ferromagnetic contribution increases with a decrease in the nanoparticle size and is proportional to the fraction of uncompensated exchange-coupled spins. It is demonstrated that the uncompensated spins form in the antiferromagnetic NiO oxide due to an increase in the fraction of surface atoms in the nanoparticles with decreasing particle size and defects in the bulk of particles.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Balaev D. A., Krasikov A. A., Dubrovskiy A. A., Balaev A. D., Popkov S. I., Kirillov V. L., Martyanov O. N.
Заглавие : Dynamic magnetization switching in NiO nanoparticles: Pulsed field magnetometry study
Место публикации : J. Supercond. Novel Magn. - 2019. - Vol. 32, Is. 2. - P.405–411. - ISSN 15571939 (ISSN), DOI 10.1007/s10948-018-4726-4
Примечания : Cited References: 32. - We are grateful to Yu.V. Knyazev, S.V. Semenov, and M.I. Kolkov for their help and to M.N. Volochaev for the TEM measurements. TEM studies were performed on the facility of Resource Sharing Center of Krasnoyarsk Scientific Center of Siberian Branch of Russian Academy of Sciences.The reported study was funded by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund to the research project no. 17-42-240138.
Ключевые слова (''Своб.индексиров.''): nio nanoparticles--pulsed field magnetization--coercivity
Аннотация: The dynamic magnetization switching of antiferromagnetic nickel oxide nanoparticles with a characteristic size of 8 nm has been experimentally investigated by pulsed field magnetometry. It is shown that, due to the presence of defects in NiO nanoparticles, as in other antiferromagnetic particles, the uncompensated magnetic moment is induced by the incomplete compensation of spins at the antiferromagnetic ordering. The dynamic magnetic hysteresis loops have been studied in pulsed fields with the maximum field (Hmax) of up to 130 kOe and pulse lengths (τP) of 4, 8, and 16 ms. According to the results obtained, the coercivity (HC) depends on both the τP and Hmax values. The observed increase in the HC value with decreasing pulse length (i.e., with increasing switching field frequency) is unambiguously related with the relaxation processes typical of single-domain ferromagnetic nanoparticles. However, the observed effect of the maximum applied field (Hmax) on the HC value is assumed to be a feature of antiferromagnetic nanoparticles.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pankrats A. I., Kolkov M. I., Martynov S. N., Popkov S. I., Krasikov A. A., Balaev A. D., Gorev M. V.
Заглавие : Peculiarities of a magnetic transition in a quasi-one-dimensional ferromagnet PbMnBO4
Место публикации : J. Magn. Magn. Mater. - 2019. - Vol. 471. - P.416-422. - ISSN 03048853 (ISSN) , DOI 10.1016/j.jmmm.2018.09.098
Примечания : Cited References: 22. - This work was supported by the Russian Foundation for Basic Research, Project no. 16-02-00563. The authors thank V. Zinenko and V. Sosnin for the fruitful and useful discussions.
Аннотация: Near the Curie temperature TC = 30.3 K, the temperature dependences of the magnetization and heat capacity of a single-crystal ferromagnet PbMnBO4 in the magnetic fields of 1, 3, 10 and 30 kOe are studied. In the strong magnetic fields, both the magnetic contribution to the specific heat and the nonlinearity of the field dependences of the magnetization are maintained up to the temperatures exceeding TC more than twice. It is assumed that in PbMnBO4 the difference between TC, the paramagnetic Curie temperature θ = 49 K and the broad temperature region above TC where the magnetic contribution to the specific heat is significant is due to the quasi-one-dimensional character of the magnetic structure of this ferromagnet. Using both the estimation of TC from the Ginzburg-Landau field theory and the θ value, the total exchange interaction parameters 2J ≈ 40.4 K (intrachain) and z′J′ ≈ 8.8 K (interchain) are determined, with z′ = 4 being the number of neighboring chains. The estimation shows that the Ginzburg-Landau field theory describing the quasi-one-dimensional behavior of PbMnBO4 is well applicable in the temperature range from to T = S2J ≈ 80 K. Above this temperature, the mean field approximation with the exchange parameter λθ based on the paramagnetic Curie temperature θ describes well the experimental temperature dependences of the magnetization in the strong magnetic field and the specific heat is determined by the lattice contribution.
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18.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Balaev D. A., Krasikov A. A., Balaev A. D., Dubrovsky A. A., Popkov S. I.
Заглавие : Nanoparticles in pulse magnetic fields techniques and experiment
Коллективы : Federal Research Center KSC SB RAS, Kirensky Institute of Physics, Research Institute of Agriculture and Ecology of the Arctic, Siberian Federal Univercity
Место публикации : International school/workshop on actual problems of condensed matter physics: Program. Book of abstracts/ ed. S. G. Ovchinnikov. - Norilsk, 2018. - P.13. - ISBN 978-5-904603-08-3
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Lepeshev A. A., Patrin G. S., Yurkin G. Yu., Vasiliev A. D., Nemtsev I. V., Gokhfeld D. M., Balaev A. D., Demin V. G., Bachurina E. P., Karpov I. V., Ushakov A. V., Fedorov, L. Yu., Irtyugo L. A., Petrov M. I.
Заглавие : Magnetic properties and critical current of superconducting nanocomposites (1 −x)YBa2Cu3O7−δ + xCuO
Коллективы : Russian Science Foundation [16-19-10054]
Место публикации : J. Supercond. Nov. Magn. - 2018. - Vol. 31, Is. 12. - P.3841-3845. - ISSN 1557-1939, DOI 10.1007/s10948-018-4676-x. - ISSN 1557-1947(eISSN)
Примечания : Cited References: 15. - The work was performed with a support of the grant of the Russian Science Foundation (project no. 16-19-10054).
Предметные рубрики: PULSED-ARC DISCHARGE
COMPOSITES
PLASMA
LOOPS
Ключевые слова (''Своб.индексиров.''): superconducting polycrystals--ybco ceramics--critical current--magnetic properties
Аннотация: The aim of this paper was to study the effect of nanoscale inclusions of CuO as the second ingredient of composites on transport properties of superconducting YBa2Cu3O7 polycrystals. The samples of YBa2Cu3O7−δ with different content of CuO nanoparticles were synthesized. The analysis of the magnetic properties was carried out within the extended critical state model. It was found that the addition of 0.5 and 1% of CuO nanoparticles leads to an increase in the intragranular density of the critical current at T= 4.2 K. A further increase of x from 2 to 15% and more than 40% decreases the critical current density. The critical current density higher than in the reference sample was also found in the samples with x= 20% and x= 24%.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Балаев, Дмитрий Александрович, Дубровский, Андрей Александрович, Красиков, Александр Александрович, Попков, Сергей Иванович, Балаев, Александр Дмитриевич, Шайхутдинов, Кирилл Александрович, Кириллов В. Л., Мартьянов О. Н.
Заглавие : Магнитные свойства наночастиц NiO: вклады антиферромагнитной и ферромагнитной подсистем в различных диапазонах магнитных полей до 250 kOe
Место публикации : Физ. тверд. тела: Наука, 2017. - Т. 59, Вып. 8. - С. 1524-1529. - ISSN 0367-3294, DOI 10.21883/FTT.2017.08.44752.39
Примечания : Библиогр.: 40. - Исследование выполнено при финансовой поддержке Российского фонда фундаментальных исследований, Правительства Красноярского края, Красноярского краевого фонда поддержки научной и научно-технической деятельности в рамках научного проекта № 17-42-240138.
Аннотация: Исследованы магнитные свойства наночастиц антиферромагнитного NiO, полученного термическим разложением гидроксокарбоната никеля. Измерения намагничивания в полях до 250 kOe показали линейный рост магнитного момента в области больших полей, обусловленный вкладом антиферромагнитно упорядоченного „ядра“ наночастиц, причем величина антиферромагнитной восприимчивости соответствует таковой для „объемного“ поликристаллического NiO. Это дало возможность определить количественно антиферромагнитный и ферромагнитный вклады в общий магнитный отклик образца. Последний возникает благодаря неполной компенсации спинов в антиферромагнитной наночастице вследствие наличия дефектов на ее поверхности. Показано, что для корректного определения суперпарамагнитной температуры блокировки необходим учет поведения антиферромагнитной восприимчивости ядра“ частиц.
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