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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Shustin M. S., Dzebisashvili D. M., Stepanenko V. A.
Заглавие : To an analytical theory of higher-order magnetic skyrmions in nonuniform magnetic fields
Колич.характеристики :9 с
Коллективы : Nanophysics and Nanoelectronics, International Symposium
Место публикации : Phys. Solid State. - 2023. - Vol. 65, Is. 6. - P.978-986. - ISSN 10637834 (ISSN), DOI 10.21883/PSS.2023.06.56111.41H. - ISSN 10906460 (eISSN)
Примечания : Cited References: 44. - The research was supported by ”BASIS“ Foundation for Development of Theoretic Physics and Mathematics (project No. 20-1-4-25-1), grant of the President of the Russian Federation MK-4687.2022.1.2, Krasnoyarsk Mathematical Center and financed by the Ministry of Science and Higher Education of the Russian Federation (Agreement No. 075-02-2023-936)
Аннотация: It is shown that axially symmetric inhomogeneous magnetic fields can lead to stabilization of higher-order magnetic skyrmions with topological charge |Q| ˃ 1 due to orbital effects. We developed the analytical theory on the energy, size, and domain wall width of the such skyrmions in a power-law inhomogeneous fields, with a parameters corresponding to strongly correlated electron systems. The results obtained may have applications in describing the formation of nontrivial magnetic structures in inhomogeneous fields of superconducting vortices in heterostructures superconductor – chiral magnet of the type [Ir1Fe0.5Co0.5Pt1]10/MgO/Nb.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Shustin M. S., Stepanenko V. A., Dzebisashvili D. M.
Заглавие : Higher-order magnetic skyrmions in nonuniform magnetic fields
Место публикации : Phys. Rev. B. - 2023. - Vol. 107, Is. 19. - Ст.195428. - ISSN 24699950 (ISSN), DOI 10.1103/PhysRevB.107.195428. - ISSN 24699969 (eISSN)
Примечания : Cited References: 75. - The authors thank Prof. I. S. Burmistrov, S. Apostoloff, E. S. Andriyakhina, M. N. Potkina, and A. D. Fedoseev for fruitful discussions. S.M.S. acknowledges the support the Foundation for the Advancement of Theoretical Physics and Mathematics “BASIS” (Grant No. 20-1-4-25-1) and Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools (Grant No. MK-4687.2022.1.2). The analytical solution of systems of nonlinear algebraic equations was carried out by S.V.A. with the support by Krasnoyarsk Mathematical Center and financed by the Ministry of Science and Higher Education of the Russian Federation (Agreement No. 075-02-2023-936)
Аннотация: For a two-dimensional Hubbard model with spin-orbit Rashba coupling in external magnetic field the structure of effective spin interactions is studied in the regime of strong electron correlations and at half-filling. It is shown that in the third order of perturbation theory, the scalar and vector chiral spin-spin interactions of the same order arise. The emergence of the latter is due to orbital effects of magnetic field. It is shown that for nonuniform fields, scalar chiral interaction can lead to stabilization of axially symmetric skyrmion states with arbitrary topological charges. Taking into account the hierarchy of effective spin interactions, an analytical theory on the optimal sizes of such states, the higher-order magnetic skyrmions, is developed for axially symmetric magnetic fields of the form h(r) ∼ rβ with ∊R.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Скоморохов, Георгий Витальевич, Беляев, Борис Афанасьевич, Соловьев, Платон Николаевич
Заглавие : Неоднородности в распределении магнитных параметров тонких пленок NiFe вблизи их краев
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. VIII Байкал. междунар. конф. BICMM-2018/ чл. прогр. ком. R. S. Iskhakov [et al.]. - Иркутск, 2018. - С. 16. - ISBN 978-5-00133-051-6
Примечания : Библиогр.: 1
РИНЦ,
Материалы конференции,
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Val'kov V. V., Fedoseev A. D.
Заглавие : The nonuniform spin polarization in the square-shaped 1D wire induced by spin-orbit coupling
Коллективы : Euro-Asian Symposium "Trends in MAGnetism", "Trends in MAGnetism", Euro-Asian Symposium, Институт физики им. Л.В. Киренского Сибирского отделения РАН
Место публикации : J. Magn. Magn. Mater.: Elsevier Science, 2017. - Vol. 440. - P.185-188. - ISSN 0304-8853, DOI 10.1016/j.jmmm.2016.12.080
Примечания : Cited References: 9. - The reported study was funded by Russian Foundation for Basic Research project nos. 16-42-242036, 16-42-243056, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund to the research project nos. 21/16, 29/16.
Ключевые слова (''Своб.индексиров.''): spin polarization--rashba spin-orbit coupling
Аннотация: It is shown, that the Rashba spin-orbit coupling induces the spatially nonuniform spin state in the square-shaped 1D wire. The electron states of this type are characterized with spin orientation changing according to the harmonic motion along the square side. The period of the oscillation is determined only by the spin-orbital coupling and the hopping parameters ratio. The modulation of spin orientation is caused by step-like changing of Rashba field direction. The obtained results were generalized on the case of polygon-shaped wire.Показано, что спин-орбитальное взаимодействие Рашбы индуцирует пространственно неоднородное спиновое состояние в 1D цепочке формы квадрата. Такие электронные состояния характеризуются изменением ориентации спина по гармоническому закону вдоль стороны квадрата. Период осцилляций определяется только отношением параметров перескока и спин-орбитального взаимодействия. Модуляция спиновой ориентации вызвана скачкообразным изменением направления поля Рашбы. Проведено обобщение полученных результатов на случай цепочке формы правильного многоугольника.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Karpov S. V., Рассказов, Илья Леонидович
Заглавие : Simulation of conditions for fabrication of optical nanowaveguides in the form of chains of spherical metal nanoparticles by electrostatic functionalization of the process substrate
Место публикации : Colloid J. - 2013. - Vol. 75, Is. 3. - P.279-288. - ISSN 1061-933X, DOI 10.1134/S1061933X13030083
Ключевые слова (''Своб.индексиров.''): deposition of metals--electrical parameter--experimental conditions--nonuniform electric field--ordered structures--selective deposition--single-domain structure--transmission property--deposition--electric fields--mathematical models--metal nanoparticles--photoexcitation--plasmons--sols--substrates
Аннотация: A method is proposed for electrostatic functionalization of substrates used to prepare ordered structures composed of closely spaced plasmon-resonant nanoparticles. The method ensures selective deposition of nanoparticles from the bulk of a colloidal system onto the substrates. This method is based on placing a metal nanotemplate of a required configuration at the opposite side of a substrate, with an electric potential being applied to the template. A mathematical model is developed to ensure that the system parameters responsible for the deposition of metal nanoparticles into ordered single-domain structures on the substrate from a bulk sol in a nonuniform electric field generated by the nanotemplate correspond to the real experimental conditions. Since the degree of imperfection of the synthesized chains governs the applicability of these structures to transmission of the optical excitation at the frequency of the surface plasmon of the particles, the dependence of the degree of imperfection on the physicochemical and electrical parameters of the system is studied using the Brownian-dynamics model. The calculations of the spectral and transmission properties of nanowaveguides of this type are exemplified. В© 2013 Pleiades Publishing, Ltd.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aplesnin S. S., Har'kov A. M., Eremin E. V., Romanova O. B., Balaev D. A., Sokolov V. V., Pichugin A. Yu.
Заглавие : Nonuniform magnetic states and electrical properties of SmXMn1-XS solid solutions
Коллективы : IEEE International Magnetics Conference
Место публикации : IEEE Trans. Magn.: IEEE-Institute Electrical and Electronics Engineers, 2011. - Vol. 47, Is. 10. - P.4413-4416. - ISSN 0018-9464, DOI 10.1109/TMAG.2011.2160715
Примечания : Cited References: 13
Ключевые слова (''Своб.индексиров.''): conductivity--magnetic semiconductors--magnetization processes
Аннотация: The real and imaginary parts of magnetic permeability at the three frequencies 100 Hz, 1 kHz and 10 kHz and magnetic moment in magnetic field H = 0.05 T in the SmXMn1-XS(0.1
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Aplesnin S.S., Har’kov A.M., Eremin E.V., Romanova O.B., Balaev D.A., Sokolov V.V.
Заглавие : Nonuniform Magnetic States and Electrical Properties SmXMnl-XS solid solutions
Коллективы : International Magnetics Conference
Место публикации : IEEE International Magnetics Conference (INTERMAG ASIA-2011): Book of abstracs. - 2011. - С. 257
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Val'kov V. V., Korovushkin M. M.
Заглавие : Splitting of the lower subband of Hubbard fermions in the Shubin-Vonsowsky model under the influence of strong intersite correlations
Место публикации : J. Exp. Theor. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2011. - Vol. 112, Is. 1. - P108-120. - ISSN 1063-7761, DOI 10.1134/S1063776110061056
Примечания : Cited References: 26. - We express our deep gratitude to R. O. Zaitsev for numerous remarks and discussions. We are grateful to A. A. Golovnya, A. A. Shklyaev, and V. A. Mitskan for specific advice on the numerical calculations of the mass operator. This work was supported by the "Quantum Condensed Matter Physics" Program of the Presidium of the Russian Academy of Sciences, the Russian Foundation for Basic Research (project no. 10-02-00251), the "Scientific and Scientific-Pedagogical Personnel of Innovational Russian for 2009-2013" Federal Goal-Oriented Program, and the Interdisciplinary Integration Project no. 53 of the Siberian Branch of the Russian Academy of Sciences. One of us (M. K.) thanks Lavrentiev's contest of youth projects of the Siberian Branch of the Russian Academy of Sciences.
Предметные рубрики: NARROW ENERGY BANDS
ELECTRON CORRELATIONS
Ключевые слова (''Своб.индексиров.''): cooper channels--cooper instability--density of electronic state--doping levels--electron concentration--energy structures--hubbard--hubbard operators--interaction energies--intersite correlation--mott-hubbard insulator--nonuniform--renormalization--root mean squares--scattering amplitudes--spectral intensity--split-off band--strongly correlated fermions--sub-bands--doping (additives)--superconducting transition temperature
Аннотация: The diagram technique for Hubbard operators is used to investigate the influence of intersite Coulomb interactions on the energy structure and Cooper instability of strongly correlated fermions. Allowance for intersite correlations in doped Mott-Hubbard insulators is shown to lead to a splitting of the lower subband of Hubbard fermions and to the formation of a band of fluctuation states as soon as the intersite interaction energy becomes comparable to or exceeds the mean kinetic energy. The spectral intensity of the splitoff band is proportional to the root-mean-square fluctuation of the occupation numbers and increases with doping level. The predicted effect changes significantly the structure of the density of electronic states. This leads to a renormalization of the pole of the scattering amplitude in the Cooper channel and manifests itself as a nonuniform (in electron concentration) modification of the dependence of the critical superconducting transition temperature.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Erkaev N. V., Shaidurov V. A., Semenov V. S., Langmayr D., Biernat H. K.
Заглавие : Peculiarities of Alfven wave propagation along a nonuniform magnetic flux tube
Место публикации : Phys. Plasmas: AMER INST PHYSICS, 2005. - Vol. 12, Is. 1. - Ст.12905. - ISSN 1070-664X, DOI 10.1063/1.1833392
Примечания : Cited References: 18
Предметные рубрики: HYDROMAGNETIC-WAVES
TRANSFER EVENTS
FIELD
SLOW
Ключевые слова (''Своб.индексиров.''): algebra--approximation theory--boundary conditions--electric conductivity--electric field effects--integral equations--magnetic flux--magnetohydrodynamics--perturbation techniques--polarization--vectors--velocity measurement--alfven wave propagation--axial symmetry--magnetic flux tubes--magnetosonic pulses--wave propagation
Аннотация: Within the framework of the assumption of large azimuthal wave numbers, the equations for Alfven and slow magnetosonic waves are obtained using frozen-in material coordinates. These equations are specified for the case of a nonuniform magnetic field with axial symmetry. Assuming a meridional polarization of the magnetic field and velocity perturbations, the effects of Alfven wave propagation are analyzed which are related to geometric characteristics of a nonuniform magnetic field: (a) A finite curvature radius of the magnetic field lines and (b) convergence of magnetic field lines. The interaction between the Alfven and magnetosonic waves is found to be strongly dependent on the curvature radius of the magnetic tube and the local plasma beta parameter. The electric field amplitude and the length scale of a wave front are found to increase very strongly in the course of the Alfven wave propagation along a converging magnetic flux tube. Also studied is a temporal decrease of the wave perturbations which is caused by dissipation at the conducting boundary. (C) 2005 American Institute of Physics.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Belyaev B. A., Kononov V. P., Ovchinnikov S. G.
Заглавие : Anisotropy characteristics in a Permalloy film induced by a nonuniform magnetic field
Место публикации : Phys. Solid State: AMER INST PHYSICS, 1998. - Vol. 40, Is. 7. - P1175-1177. - ISSN 1063-7834, DOI 10.1134/1.1130513
Примечания : Cited References: 3
Аннотация: Inhomogeneities were observed for the first time in the magnetic structure of a thin Permalloy film, induced by a strongly nonuniform magnetic field applied in the plane of the substrate during fabrication of the samples. The films were obtained by vacuum deposition using a molecular-beam epitaxy system. A nonuniform field was created on the substrate using four samarium-cobalt magnets. The anisotropy of local sections of the samples was measured using a scanning-ferromagnetic-resonance spectrometer. A strong correlation was observed between the distribution of the magnitude and direction of the local magnetic anisotropy of the film and the magnetic-field distribution in the plane of the substrate. (C) 1998 American Institute of Physics.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : TSIFRINOVICH V. I., AKHALKATSI A. M., KILIPTARI I. G.
Заглавие : SINGLE-PULSE ECHO IN FERROMAGNETS WITH A NONUNIFORM GAIN COEFFICIENT
Место публикации : Fiz. Tverd. Tela: MEZHDUNARODNAYA KNIGA, 1990. - Vol. 32, Is. 5. - P1426-1428. - ISSN 0367-3294
Примечания : Cited References: 7
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zakharov Y. V., Mankov Y. I., Titov L.S.
Заглавие : Negative low-temperature magnetoresistance of a magnetically nonuniform compensated metal
Место публикации : Fiz. Nizk. Temp. - 1986. - Vol. 12, Is. 4. - P.408-416. - ISSN 0132-6414
Примечания : Cited References: 24
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : IGNATCHENKO V. A., MANKOV Y. I., RAKHMANOV F. V.
Заглавие : PLASMA-WAVES IN NONUNIFORM SEMICONDUCTORS
Место публикации : Fiz. Tverd. Tela: MEZHDUNARODNAYA KNIGA, 1982. - Vol. 24, Is. 8. - P2292-2295. - ISSN 0367-3294
Примечания : Cited References: 3
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Tsifrinovich V. I.
Заглавие : Narrowing of nonuniform nmr lines in magnetics
Место публикации : Fiz. Tverd. Tela. - Vol. 23, Is. 12. - P.3521-3525. - ISSN 0367-3294
Примечания : Cited References: 16
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