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Long-range interaction of magnetic moments in a coupled system of superconductor-ferromagnet-superconductor Josephson junctions with anomalous ground-state phase shift
Physical Review B: Condensed Matter and Materials Physics. 2022. Vol. 105. No. 2. Article 024513.
Bobkov G. A., I.V. Bobkova, Bobkov A. M.
A mechanism of a superconductivity-mediated interaction of two magnets in a system of coupled superconductor-ferromagnet-superconductor (S-F-S) Josephson junctions (JJs) with spin-orbit interaction is proposed. The predicted indirect magnetic interaction favors the antiparallel orientation of the magnets. Its spatial scale is not restricted by the proximity length scales of the superconductor. Our estimates suggest that the interaction strength is not reduced considerably even at the macroscopic scales of the order of millimeters. At larger distances l between the magnets the coupling constant exhibits the long-range power-law 1/l behavior. The mechanism of the interaction is based on two key ingredients: (i) the anomalous ground-state phase shift in the S-F-S JJ provides a magnetoelectric coupling between the condensate phase and the magnetization, and (ii) the interaction is mediated by the condensate phase of the superconducting region connecting both JJs. In addition, we demonstrate high tunability of the total magnetic configuration of the system by the externally controlled superconducting phase between the leads.
Gurina D., Fashchevsky K. A., Oparin R. D. et al., Surfaces and Interfaces 2026 Vol. 98 Article 110545
In this work, we combine experimental characterization and molecular dynamics (MD) simulations to elucidate the molecular mechanisms governing the impregnation of mefenamic acid (MFA) into nanocrystalline cellulose (NCC) aerogels. NCC aerogels were impregnated with MFA in scCO2, and low-temperature nitrogen adsorption revealed a concentration-dependent decrease in surface area, pore volume, and pore size, with an ...
Added: September 8, 2026
Huang D., Chen Y., Luo X. et al., Chinese Journal of Physics 2026 Vol. 103 P. 1803–1814
Using self-consistent Bogoliubov-de Gennes calculations for kagome flakes framed by armchair
and flat edges, we observe a configuration-dependent spatial inhomogeneity of an 𝑠-wave superconducting
condensate. Specifically, at half-filling, the local pair potential is significantly enhanced
by up to 77.8% at edge centers and up to 148.9% at corners, subsequently boosting their
local critical temperatures by up to 13.5% and ...
Added: September 7, 2026
Marychev P., Shanenko A., Physical Review B: Condensed Matter and Materials Physics 2026 Vol. 114 No. 7 Article 074509
We investigate the effect of weak interband impurity scattering on the intertype (IT) domain between type-I and type-II superconductivity in diffusive two-band superconductors. Our results show that the significant broadening of the IT domain with increasing band diffusivity ratio, previously established in the absence of interband scattering, persists under weak interband scattering. However, depending on ...
Added: September 7, 2026
Denis K., Н. Новгород: Нижегородский государственный университет им. Н.И. Лобачевского, 2025.
В учебном пособии излагаются элементы теории и описание избранных экспериментальных результатов, полученных в активно развивающейся физике топологических изоляторов. Рассмотрены наиболее простые модели поверхностных и краевых состояний в двумерных и трёхмерных топологических изоляторах, их структура в магнитном поле, а также основы топологических методов для определения их свойств. Обсуждаются модели квантовых точек, формируемых в топологических изоляторах. Приведены ...
Added: September 6, 2026
Denis K., Звонков Б. Н., Вихрова О. В. et al., Физика твердого тела 2021 Т. 63 № 9 С. 1245–1252
Сочетанием методов МОС-гидридной эпитаксии и импульсного лазерного нанесения изготовлены гетеронаноструктуры InGaAs/GaAs со слоем (Ga, Mn)As на поверхности, и исследовано влияние воздействия импульсного эксимерного лазера (длина волны 248 nm, длительность импульса ~30 ns, плотность энергии в диапазоне 200-360 mJ/cm2) на их излучательные, структурные и гальваномагнитные свойства. При исследованиях использовалась спектроскопия фотолюминесценции, дополненная возможностью анализа поляризационных характеристик ...
Added: September 6, 2026
Воздействие импульсов эксимерного лазера на светоизлучающие InGaAs/GaAs-структуры с (Ga, Mn)As-слоем
Denis K., Вихрова О. В., Данилов Ю. А. et al., Физика твердого тела 2021 Т. 63 № 3 С. 346–355
Исследована возможность модифицирования лазерным отжигом свойств слоя (Ga, Mn)As, расположенного на поверхности квантово-размерной InGaAs/GaAs-структуры, с сохранением ее излучательных свойств. Для проведения исследований сочетанием методов МОС-гидридной эпитаксии и импульсного лазерного нанесения были изготовлены структуры с четырьмя квантовыми ямами InGaAs/GaAs, (содержание индия от 0.08 до 0.25), расположенными на различном расстоянии от слоя (Ga, Mn)As. В процессе исследований ...
Added: September 6, 2026
Denis K., Lavrukhina E. A., Journal of Physics: Conference Series 2021 Vol. 2103 Article 012201
A model of quasistationary states is constructed for the one-dimensional edge states propagating along the edge of a two-dimensional topological insulator based on HgTe/CdTe quantum well in the presence of magnetic barriers with finite transparency. The lifetimes of these quasistationary states are found analytically and numerically via different approaches including the solution of the stationary ...
Added: September 6, 2026
Denis K., Dorokhin M. V., Ved M. V. et al., Physical Review B: Condensed Matter and Materials Physics 2021 Vol. 104 No. 12 Article 125309
The GaAs/InGaAs quantum wells with a ferromagnetic δ〈Mn〉 layer in GaAs barrier demonstrate a set of interesting spin-related phenomena originating from Mn-hole interaction. One of such phenomena is a spin-memory effect which consists of Mn spin polarization induced by interaction with vicinity spin-polarized holes generated under the exposure by short circularly polarized light pulses. Here long Mn ...
Added: September 6, 2026
Denis K., Запруднов Н. А., Физика и техника полупроводников 2022 Т. 56 № 10 С. 973–978
Исследована динамика туннелирования и спина для дырочных состояний в двойной квантовой точке на основе GaAs при наличии сильного спин-орбитального взаимодействия и периодического электрического поля. Рассмотрены режимы туннелирования с переворотом спина в условиях "медленной" эволюции, при которой частота поля меньше остальных энергетических параметров стационарной части гамильтониана. Обнаружено, что в таких условиях туннелирование с переворотом спина может ...
Added: September 6, 2026
Denis K., Kalentyeva I. L., Vikhrova O. V. et al., Journal of Magnetism and Magnetic Materials 2022 Vol. 556 Article 169360
We have investigated the layers of the (Ga,Mn)As diluted magnetic semiconductor with the thickness in the range of 150 – 400 nm, which have been formed by the combination of the methods of a pulsed laser deposition and a post-growth pulsed laser annealing. It has been found that the laser annealing has a significant effect on the structural, ...
Added: September 6, 2026
Denis K., Konakov A. A., Lavrukhina E. A., Journal of Physics: Condensed Matter 2022 Vol. 34 Article 405302
A model of bound state formation from the delocalized edge states of 2D topological insulator (TI) is derived by considering the effects of magnetic barriers attached to the edge of the HgTe/CdTe quantum well. The resulting structure has a spatial form of 1D quantum dot (QD) with variable number of bound states depending on barrier ...
Added: September 6, 2026
Denis K., Studenikin S. A., Physical Review B: Condensed Matter and Materials Physics 2022 Vol. 106 No. 19 Article 195414
Single-spin state evolution induced by the Landau-Zener-Stückelberg-Majorana (LZSM) interference in a Zeeman-spit four-level system in a periodically driven double quantum dot is studied theoretically by the Floquet stroboscopic method. An interplay between spin-conserving and spin-flip tunneling processes with the electric dipole spin resonance (EDSR) that is induced in an individual dot and enhanced by the ...
Added: September 6, 2026
Denis K., Лаврухина Е. А., Тележников А. В., Физика и техника полупроводников 2023 Т. 57 № 7 С. 551–554
Разработана модель локализованных состояний в двойной квантовой точке на крае топологического изолятора на основе квантовой ямы HgTe/CdTe, сформированной тремя магнитными барьерами. Исследованы особенности энергетического спектра, плотности вероятности и спиновой плотности квантовых состояний в зависимости от ориентации векторов намагниченности магнитных барьеров. Изучена локализация волновых функций слева и справа от точки антикроссинга в спектре и сделан вывод ...
Added: September 6, 2026
Mazanik A. A., I.V. Bobkova, Physical Review B: Condensed Matter and Materials Physics 2022 Vol. 105 No. 141 Article 144502
We predict that long-range triplet correlations (LRTC) in superconductor/ferromagnet (S/F) hybrids with extrinsic impurity spin-orbit coupling can be generated and manipulated by supercurrent flowing in the superconducting leads along the S/F interfaces. The LRTC appear via two basic mechanisms. The essence of the first one is the generation of triplets by the superconducting spin Hall ...
Added: October 27, 2022
Pugach N., Heim D., Seleznev D. V. et al., Superconductor Science and Technology 2022 Vol. 35 Article 025002
We propose a superconducting spin valve based on a Josephson junction with B20-family
magnetic metal as a barrier material. Our analysis shows that the states of this element can be
switched by reorienting the intrinsic non-collinear magnetization of the spiral magnet. This
reorientation modifies long-range spin-triplet correlations and thereby strongly influences the
critical Josephson current. Compared to superconducting spin ...
Added: March 26, 2022
Ioselevich P., Chuklanov D. A., JETP Letters 2021 Vol. 113 P. 631–637
We consider a long diffusive Josephson junction where the weak link is a thin (normal metal (N)–ferromagnet (F)) bilayer (N and F form parallel links between superconductors (Ss)). We show that superconductivity in the weak link can be described by an effective one-dimensional Usadel equation containing a “diluted” exchange field as well as a weak ...
Added: October 25, 2021
П.А.Иоселевич, Чукланов Д. А., Письма в Журнал экспериментальной и теоретической физики 2021 Т. 113 № 10 С. 661–668
Рассматривается длинный диффузный контакт Джозефсона, слабой связью в котором является тонкий бислой нормальный металл (N)–ферромагнетик (F), так что N и F образуют параллельные связи между сверхпроводниками S. Показано, что сверхпроводимость в такой слабой связи описывается эффективным одномерным уравнением Узаделя, содержащим ослабленное обменное поле, а также распаривающий член. Механизм распаривания основан на неотъемлемой неоднородности бислоя и ...
Added: October 25, 2021
Rabinovich D. S., I.V. Bobkova, Bobkov A. M., Physical Review B: Condensed Matter and Materials Physics 2020 Vol. 101 No. 5 P. 1–10
We consider a hybrid structure consisting of superconducting or normal leads with a combined ferromagnet–three-dimensional topological insulator interlayer. We compare responses of a Josephson junction and a normal junction to magnetic texture dynamics. In both cases the electromotive force resulting from the magnetization dynamics generates a voltage between the junction leads. For an open circuit ...
Added: February 15, 2021
Rabinovich D. S., Bobkova I.V., Bobkov A. M. et al., Physical Review Letters 2019 Vol. 123 P. 207001
We describe resistive states of the system combining two types of orderings—a superconducting and a ferromagnetic one. It is shown that in the presence of magnetization dynamics such systems become inherently dissipative and in principle cannot sustain any amount of the superconducting current because of the voltage generated by the magnetization dynamics. We calculate generic ...
Added: November 19, 2019
Kuzin A., В кн.: Межвузовская научно-техническая конференция студентов, аспирантов и молодых специалистов им. Е.В. Арменского.: М.: МИЭМ НИУ ВШЭ, 2019. С. 197.
Целью изучения данной работы является количественное исследование вольт - амперных характеристик (ВАХ) переходов SFIFS (диффузионный сверхпроводник / ферромагнетик / изолятор / ферромагнетик / сверхпроводник в туннельных джозефсоновских переходах). Представлена теоретическая модель SFIFS-контакта с основными геометрическими параметрами. ...
Added: May 22, 2019
P. A. Ioselevich, Ostrovsky P. M., Ya. V. Fominov, Physical Review B: Condensed Matter and Materials Physics 2018 Vol. 98 No. 144521 P. 144521-1–144521-15
We study the supercurrent in quasi-one-dimensional Josephson junctions with a weak link involving magnetism, either via magnetic impurities or via ferromagnetism. In the case of weak links longer than the magnetic pair-breaking length, the Josephson effect is dominated by mesoscopic fluctuations. We establish the supercurrent-phase dependence I(φ) along with statistics of its sample-dependent properties in junctions with ...
Added: October 30, 2018
Bolginov V. V., Rossolenko A. N., Shkarin A. B. et al., Journal of Low Temperature Physics 2018 Vol. 190 No. 5-6 P. 302–314
We have implemented a trilayer technological approach to fabricate Nb−Cu0.47Ni0.53−Nb superconducting phase inverters (π-junctions) with enhanced critical current. Within this technique, all three layers of the superconductor– ferromagnet–superconductor junction deposited in a single vacuum cycle that have allowed us to obtain π-junctions with critical current density up to 20 kA/cm2. The value achieved is a ...
Added: October 24, 2018