Magnetization relaxation dynamics in polydisperse ferrofluids
Электронный научный архив УРФУ
Информация об архиве | Просмотр оригинала| Поле | Значение | |
| Заглавие |
Magnetization relaxation dynamics in polydisperse ferrofluids
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| Автор |
Ivanov, A. O.
Camp, P. J. |
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| Тематика |
BROWNIAN MOVEMENT
DIPOLE MOMENT ELECTRIC DIPOLE MOMENTS FOKKER PLANCK EQUATION MAGNETIC BUBBLES MAGNETIC RELAXATION NANOMAGNETICS PARTICLE SIZE POLYDISPERSITY BROWNIAN MAGNETIC DIPOLE-DIPOLE INTERACTION MAGNETIZATION DECAY MAGNETIZATION RELAXATION PARTICLES SIZES POLYDISPERSE FERROFLUIDS RELAXATION DYNAMICS ROTATION TIME SATURATION VALUES STRONG MAGNETIC FIELDS MAGNETIC FLUIDS |
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| Описание |
When a ferrofluid is magnetized in a strong magnetic field, and then the field is switched off, the magnetization decays from its saturation value to zero. The dynamics of this process are controlled by the rotations of the constituent magnetic nanoparticles, and for the Brownian mechanism, the respective rotation times are strongly influenced by the particle size and the magnetic dipole-dipole interactions between the particles. In this work, the effects of polydispersity and interactions on the magnetic relaxation are studied using a combination of analytical theory and Brownian dynamics simulations. The theory is based on the Fokker-Planck-Brown equation for Brownian rotation and includes a self-consistent, mean-field treatment of the dipole-dipole interactions. The most interesting predictions from the theory are that, at short times, the relaxation of each particle type is equal to its intrinsic Brownian rotation time, while at long times, each particle type has the same effective relaxation time, which is longer than any of the individual Brownian rotation times. Noninteracting particles, though, always relax at a rate controlled only by the Brownian rotation times. This illustrates the importance of including the effects of polydispersity and interactions when analyzing the results from magnetic relaxometry experiments on real ferrofluids, which are rarely monodisperse. © 2023 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.
075-02-2023-935 The research (A.O.I.) was partly supported by the Ural Mathematical Center within the Project No. 075-02-2023-935. |
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| Дата |
2024-04-05T16:18:47Z
2024-04-05T16:18:47Z 2023 |
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| Тип |
Article
Journal article (info:eu-repo/semantics/article) |info:eu-repo/semantics/publishedVersion |
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| Идентификатор |
Ivanov, AO & Camp, PJ 2023, 'Magnetization relaxation dynamics in polydisperse ferrofluids', Physical Review E, Том. 107, № 3, 034604. https://doi.org/10.1103/PhysRevE.107.034604
Ivanov, A. O., & Camp, P. J. (2023). Magnetization relaxation dynamics in polydisperse ferrofluids. Physical Review E, 107(3), [034604]. https://doi.org/10.1103/PhysRevE.107.034604 2470-0045 Final All Open Access, Hybrid Gold, Green https://www.scopus.com/inward/record.uri?eid=2-s2.0-85151376029&doi=10.1103%2fPhysRevE.107.034604&partnerID=40&md5=2effd96393b59a7915aad5f7c57f9824 http://link.aps.org/pdf/10.1103/PhysRevE.107.034604 http://elar.urfu.ru/handle/10995/130351 10.1103/PhysRevE.107.034604 85151376029 000957727500005 |
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| Язык |
en
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| Права |
Open access (info:eu-repo/semantics/openAccess)
cc-by https://creativecommons.org/licenses/by/4.0/ |
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| Формат |
application/pdf
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| Издатель |
American Physical Society
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| Источник |
Physical Review E
Physical Review E |
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