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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Maksimova A.N., Gokhfeld D. M., Moroz A.N., Kashurnikov V.A.
Заглавие : Relaxation of the trapped magnetic flux in a mesoscopic HTS with artificial pinning in the form of submicron holes
Колич.характеристики :10 с
Место публикации : Chin. J. Phys. - 2024. - Vol. 88. - P.493-502. - ISSN 05779073 (ISSN), DOI 10.1016/j.cjph.2023.11.030. - ISSN 23099097 (eISSN)
Примечания : Cited References: 31. - V.A. Kashurnikov and A.N. Maksimova were supported by the Ministry of Science and Higher Education of the Russian Federation (state task project No. FSWU-2023-0031), A.N. Moroz was supported by MEPhI Program Priority 2030
Аннотация: Vortex relaxation has been studied in a microsized HTS with various distributions of artificial pinning in the form of submicro-holes. It has been shown that, in some cases, for a superconductor with dimensions up to several micrometers, the time dependences of the trapped magnetic field do not correspond with the collective creep model. The dependences of the trapped-field relaxation rate and vortex activation energy on the magnetizing field (up to 0.5 T) and temperature (up to 50 K) have been obtained. It has been shown that the presence of submicro-holes slightly increases the relaxation rate, mainly due to the decrease in the number of random nanosized pinning centers.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bobrov P. P., Kroshka E. S., Muzalevskiy K. V.
Заглавие : The effect of dielectric relaxation processes on the complex dielectric permittivity of soils at frequencies from 10 kHz to 8 GHz—Part II: Broadband analysis
Колич.характеристики :11 с
Место публикации : IEEE Trans. Geosci. Remote Sens. - 2024. - Vol. 62. - Ст.2000411. - ISSN 01962892 (ISSN), DOI 10.1109/TGRS.2023.3340693. - ISSN 15580644 (eISSN)
Примечания : Cited References: 51
Аннотация: This article is the second in a series evaluating the effect of dielectric relaxation processes on the relatively effective complex dielectric permittivity (RCP) of soils. Part II is based on the results of experimental measurements in the frequency range 10 kHz to 8–20 GHz. The broadband dielectric spectrum model includes the high-frequency part as a model of the dielectric mixture and the relaxation part as the sum of three relaxation processes modeled by the Debye and Cole–Cole formulas. For modeling the high-frequency part of the spectrum, the Dobson and Mironov models were considered as possible options. As stated in Part I, the influence of relaxation processes on the imaginary part of the RCP extends up to frequencies of units of gigahertz. The increase in the imaginary part in these models was compensated by unrealistically high values of the specific electrical conductivity of free and bound water. We examined the correspondence of these models to experimental data at frequencies above 2–5 GHz, assuming that the conductivity of bound and free water is zero. The parameters of relaxation processes were found while solving the least-square optimization problem using the technique for determining the continuous distribution of relaxation times (DRTs). Found process parameters depend on the content of clay, organic carbon, and moisture of the samples. The more clay is in the soil, the greater the strength of these processes is. The influence of organic carbon with the conditions being equal consists in the reduction of the real and imaginary parts of RCP.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zobov V. E., Lundin A. A.
Заглавие : Dependence of the relaxation rate of coherent states on the number of correlated spins and the order of coherence
Колич.характеристики :6 с
Место публикации : JETP Lett. - 2023. - Vol. 117, Is. 12. - P.932-937. - ISSN 00213640 (ISSN), DOI 10.1134/S0021364023601525. - ISSN 10906487 (eISSN)
Примечания : Cited References: 29. - This work was supported by the Ministry of Science and Higher Education of the Russian Federation (state assignment no. 122040500060-4)
Аннотация: The relaxation of the components of the multiple-quantum NMR spectrum of a solid under the effect of the dipole–dipole interactions during the evolution period is considered. It is taken into account that clusters of dynamically correlated spins of different sizes are formed in the preparatory period, and their degradation depends on their size and coherence order. To calculate the size distribution function of clusters and their degradation function, a physical model including relaxation processes is developed. Using this model, an analytical result for a multiple-quantum spectrum is obtained. Agreement is obtained between the theoretical and experimental dependences of the coherence degradation rates in adamantane scaled by the square root of the average cluster size. The parameters of the above functions are found from the comparison of these dependences.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Krakhalev M. N., Gardymova A. P., Rudyak, Vladimir Yu., Barbashov, Vadim A., Zyryanov V. Ya.
Заглавие : Electrically induced transformation of cholesteric droplets under homeotropic boundary conditions
Колич.характеристики :7 с
Место публикации : J. Mol. Liq. - 2023. - Vol. 385. - Ст.122379. - ISSN 01677322 (ISSN), DOI 10.1016/j.molliq.2023.122379. - ISSN 18733166 (eISSN)
Примечания : Cited References: 37. - This research was funded by Russian Science Foundation, Grant No. 20-72-10038. The research was carried out using the equipment of the shared research facilities of HPC computing resources at Lomonosov Moscow State University
Аннотация: Cholesteric droplets under homeotropic boundary conditions demonstrate a rich variety of possible orientational structures. We have implemented electrically controlled switching of such droplets between two classes of stable states: i) structures with cylindrical cholesteric layers and ii) layer-like structures with one or more λ+1/2-disclinations. Structure relaxation after switching off the voltage proceeded via the fast (less than 1 s), the slow (more than 1 s), and the stabilization stages (~10 hours). We investigated intermediate long-lived metastable states occurring in the relaxation process and explained the formation of various structures in cholesteric droplets. The fast and the slow stages of relaxation were found to be sensitive to the voltage reduction regime. We have determined the combinations of droplet size and voltage reduction regimes leading to the two types of structures after relaxation.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Balaev D. A., Skorobogatov S. A., Velikanov D. A., Bayukov O. A., Stolyar S. V., Yaroslavtsev R. N., Iskhakov R. S., Knyazev Yu. V.
Заглавие : Superparamagnetic relaxation in ensembles og ultrasmall ferrihydrite nanoparticles
Коллективы : Байкальская международная конференция "Магнитные материалы. Новые технологии", "Магнитные материалы. Новые технологии", Байкальская международная конференция, "Magnetic materials. New tecnologies", Baikal International Conference, Иркутский государственный университет
Место публикации : Магнитные материалы. Новые технологии: тез. докл. IX Байкал. междунар. конф. BICMM-2023/ чл. прогр. ком.: S. S. Aplesnin [et al.] ; чл. орг. ком. R. S. Iskhakov [et al.]. - Иркутск, 2023. - P.92. - ISBN 978-5-962402178-0
Примечания : Библиогр.: 1
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Stolyar S. V., Li O. A., Nikolaeva E. D., Boev N. M., Vorotynov A. M., Velikanov D. A., Iskhakov R. S., Pyankov V. F., Knyazev Yu. V., Bayukov O. A., Shokhrina A. O., Molokeev M. S., Vasiliev A. D.
Заглавие : Heating of magnetic powders in the ferromagnetic resonance mode at a frequency of 8.9 GHz
Колич.характеристики :8 с
Коллективы : Nanophysics and Nanoelectronics, International Symposium
Место публикации : Phys. Solid State. - 2023. - Vol. 65, Is. 6. - P.963-970. - ISSN 10637834 (ISSN), DOI 10.21883/PSS.2023.06.56109.21H. - ISSN 10906460 (eISSN)
Примечания : Cited References: 25
Аннотация: Nickel ferrite nanoparticles 4 nm in size were synthesized by chemical deposition. Subsequent annealing at T=700°C for 5 h led to an increase in the particle size to 63 nm. The Mossbauer spectra and the frequency-field dependences of ferromagnetic resonance have been measured. It has been shown that freshly prepared powders are superparamagnetic at room temperature. The kinetic dependences of the heating of nanoparticles in the ferromagnetic resonance mode at a frequency of 8.9 GHz were measured. It was found that the maximum rate of temperature increase in this mode for a ferromagnetic powder is an order of magnitude greater than for the superparamagnetic state (1.2 and 0.13 K/s, respectively). The latter is determined by the saturation magnetization of the studied powders.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Orlov Yu. S., Nikolaev S. V., Ovchinnikov S. G.
Заглавие : Light-induced ultrafast quantum relaxation dynamics of magnetically ordered spin crossover systems
Коллективы : Российская академия наук, Физико-технический институт им. Е.К. Завойского ФИЦ Казанского научного центра РАН, Казанский (Приволжский) федеральный университет, Euro-Asian Symposium "Trends in MAGnetism", "Trends in MAGnetism", Euro-Asian Symposium
Место публикации : VIII Euro-Asian symposium "Trends in magnetism" (EASTMAG-2022): Book of abstracts/ program com. S. G. Ovchinnikov [et al.]. - 2022. - Vol. 2, Sect. H: Magnetism of strongly correlated electron systems. - Ст.H.P16. - P.106. - ISBN 978-5-94469-051-7
Примечания : Cited References: 1. - The study was supported by the Russian Scientiʅc Foundation, the Krasnoyarsk Regional Fund of Science, grant No. 22-22-20007
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Balaev D. A., Stolyar S. V., Krasikov A. A., Bayukov O. A., Yaroslavtsev R. N., Velikanov D. A., Iskhakov R. S., Knyazev Yu. V.
Заглавие : Effect of the interparticle interactions on superparamagnetic relaxation
Коллективы : Российская академия наук, Физико-технический институт им. Е.К. Завойского ФИЦ Казанского научного центра РАН, Казанский (Приволжский) федеральный университет, Euro-Asian Symposium "Trends in MAGnetism", "Trends in MAGnetism", Euro-Asian Symposium
Место публикации : VIII Euro-Asian symposium "Trends in magnetism" (EASTMAG-2022): Book of abstracts/ program com. S. G. Ovchinnikov [et al.]. - 2022. - Vol. 1, Sect.: Magnetotransport, magnetooptics and magnetophotonics. - Ст.D.O11. - P.437-438. - ISBN 978-5-94469-051-7
Примечания : Cited References: 3. - This study was supported by the Russian Science Foundation, Project No. 21-72-00025 (https://rscf.ru/project/21-72-00025/)
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mikhailov A. A., Maksimova A. N., Moroz A. N., Gokhfeld D. M.
Заглавие : Temperature and dimensional dependence of the irreversibility field of a layered high-temperature superconductor
Колич.характеристики :6 с
Место публикации : Phys. At. Nucl. - 2022. - Vol. 85, Is. 10. - P.1652-1657. - ISSN 10637788 (ISSN), DOI 10.1134/S1063778822100398. - ISSN 1562692X (eISSN)
Примечания : Cited References: 23. - The work was supported by the “Prioritet-2030” program of National Research Nuclear University MEPhI
Аннотация: The Monte Carlo method was used in a 2D model of the layered HTSC to calculate the magnetization curves of a granulated high-temperature superconductor for various sizes of granules. In this approach magnetization of granules alone is taken into account, while the contribution of the gaps between granules is small and neglected. The irreversibility field has been found to decrease with temperature at the fixed size of granules and increase as the granule size increases at fixed temperature. The time dependence of residual magnetization has been studied at various temperatures. The relaxation rate is shown not to depend on the granule size at low temperatures but to decrease with the increasing size (provided that the granule size is less than 3 μm) at a high temperature when the magnetic flux creep becomes of importance.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Knyazev Yu. V., Balaev D. A., Yaroslavtsev R. N., Krasikov A. A., Velikanov D. A., Mikhlin Y. L., Volochaev M. N., Bayukov O. A., Stolyar S. V., Iskhakov R. S.
Заглавие : Tuning of the interparticle interactions in ultrafine ferrihydrite nanoparticles
Место публикации : Adv. Nano Res. - 2022. - Vol. 12, Is. 6. - P.605-616. - ISSN 2287237X (ISSN), DOI 10.12989/anr.2022.12.6.605
Примечания : Cited References: 73. - This study was supported by the Russian Science Foundation, project no. 21-72-00025 “Tuning the Magnetic Properties of Ultrafine Biocompatible Ferrihydrite Nanoparticles through Interparticle Interactions” (https://rscf.ru/project/21-72-00025/)
Аннотация: We prepared two samples of ultrafine ferrihydrite (FH) nanoparticle ensembles of quite a different origin. First is the biosynthesized sample (as a product of the vital activity of bacteria Klebsiella oxytoca (hereinafter marked as FH-bact) with a natural organic coating and negligible magnetic interparticle interactions. And the second one is the chemically synthesized ferrihydrite (hereinafter FH-chem) without any coating and high level of the interparticle interactions. The interparticle magnetic interactions have been tuned by modifying the nanoparticle surface in both samples. The coating of the FH-bact sample has been partially removed by annealing at 150℃ for 24 h (hereinafter FH-annealed). The FH-chem sample, vice versa, has been coated (1.0 g) with biocompatible polysaccharide (arabinogalactan) in an ultrasonic bath for 10 min (hereinafter FH-coated). The changes in the surface properties of nanoparticles have been controlled by XPS. According to the electron microscopy data, the modification of the nanoparticle surface does not drastically change the particle shape and size. A change in the average nanoparticle size in sample FH-annealed to 3.3 nm relative to the value in the other samples (2.6 nm) has only been observed. The estimated particle coating thickness is about 0.2-0.3 nm for samples FH-bact and FH-coated and 0.1 nm for sample FH-annealed. Mössbauer and magnetization measurements are definitely shown that the drastic change in the blocking temperature is caused by the interparticle interactions. The experimental temperature dependences of the hyperfine field hf(T) for samples FH-bact and FH-coated have not revealed the effect of interparticle interactions. Otherwise, the interparticle interaction energy Eint estimated from the hf(T) for samples FH-chem and FH-annealed has been found to be 121kB and 259kB, respectively.
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