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Superconducting spin valves controlled by spiral re-orientation in MnSi
Cornell University
,
2017.
No. 1702.08828.
We propose a superconducting spin-triplet valve of a new type. This spin valve consists of a bilayer
that involves a superconductor and an itinerant magnetic material, with the magnet showing an
intrinsic non-collinear magnetic order characterized by a wave vector Q that may be aligned in a
few equivalent preferred directions under control of a weak external magnetic field. Re-orienting the
direction of Q allows one to controllably modify long-range spin-triplet superconducting correlations
in the magnetic material, leading to spin-valve switching behavior. This new type of superconducting
spin valve may be used as a magnetic memory element for cryogenic nanoelectronics. It has the
following advantages in comparison with superconducting spin valves proposed earlier: (i) it contains
only one magnetic layer, which may be more easily fabricated and controlled; (ii) its ground states
are separated by a potential barrier, which solves the “half-select” problem of the addressed switch
of such memory elements.
Publication based on the results of:
Heim D., Pugach N., Kupriyanov M. et al., New Journal of Physics 2015 Vol. 17 P. 113022
Using the Usadel approach, we provide a formalism that allows us to calculate the critical current density of 21 different types of Josephson junctions (JJs) with a ferromagnetic (F) barrier and additional insulating (I) or/and normal (N) layers inserted between the F layer and superconducting (S) electrodes. In particular, we obtain that in SFS JJs, ...
Added: February 23, 2017
Shurakov A., Lobanov Y., Goltsman G., Superconductor Science and Technology 2015 Vol. 29 No. 2 P. 023001
The discovery of hot-electron phenomena in a thin superconducting film in the last century was followed by numerous experimental studies of its appearance in different materials aiming for a better understanding of the phenomena and consequent implementation of terahertz detection systems for practical applications. In contrast to the competitors such as superconductor-insulator-superconductor tunnel junctions and ...
Added: February 19, 2016
Gusev N., Dgheparov Daniil, Pugach N. et al., Applied Physics Letters 2021 Vol. 118 P. 1-6
We propose a method to control a bilayer superconducting spin valve (SSV) which does not perturb its superconducting state and is suitable for energy saving cryogenic electronics. This SSV consists of a superconducting layer and a helimagnetic layer of B20 family compounds, namely, Nb and spiral antiferromagnet MnSi. Thanks to unique properties of MnSi—broken inversion ...
Added: June 29, 2021
Stoutimore M. J., Rossolenko A. N., Bolginov V. et al., / undefined. Series "cond-mat". 2018. No. 1805.12546.
We report the observation of a current-phase relation dominated by the second Josephson harmonic in superconductor-ferromagnet-superconductor junctions. The exotic current-phase relation is realized in the vicinity of a temperature-controlled 0-to-π junction transition, at which the first Josephson harmonic vanishes. Direct current-phase relation measurements, as well as Josephson interferometry, non-vanishing supercurrent and half-integer Shapiro steps at ...
Added: October 30, 2018
Heim D., Pugach N., Kupriyanov M. et al., Journal of Physics: Condensed Matter 2013 Vol. 25 P. (2013) 239601
Added: February 24, 2017
Tretyakov I., Ryabchun S., Finkel M. et al., Applied Physics Letters 2011 Vol. 98 No. 3 P. 033507
We report a record double sideband noise temperature of 600 K (5h/ k B) offered by a NbN hot-electron bolometer receiver at 2.5 THz. Allowing for standing wave effects, this value was found to be constant in the intermediate frequency range 1-7 GHz, which indicates that the mixer has an unprecedentedly large noise bandwidth in ...
Added: July 1, 2014
Aladyshkin A., Nefedov I. undefined., Aladyshkina A. S. et al., Physica C: Superconductivity and its Applications 2012 Vol. 479 P. 98-101
We investigate numerically the formation of vortex–antivortex pairs in thin-film superconducting strip in the presence of a straight current-carrying wire, oriented perpendicular to this strip. We demonstrate that the change in the number of the trapped vortices/antivortices inside the strip near the current-carrying wire results in a oscillatory dependence of the critical current Ic on ...
Added: November 19, 2012
Smirnov K., Moshkova M., Antipov A. et al., IEEE Transactions on Applied Superconductivity 2021 Vol. 31 No. 2 P. 1-4
In this article, present the first detailed study of cascade switching in superconducting photon number resolving detectors. The detectors were made in the form of four parallel nanowires, coupled with the single-mode optical fiber and mounted into a closed-cycle refrigerator with a temperature of 2.1 K. We found out the value of additional false pulses ...
Added: January 16, 2021
Curran P., Kim J., Satchell N. et al., Applied Physics Letters 2015 Vol. 107 P. 262602-262602
We demonstrate that the magnetic state of a superconducting spin valve, that is normally controlled with an external magnetic field, can also be manipulated by varying the temperature which increases the functionality and flexibility of such structures as switching elements. In this case, switching is driven by changes in the magnetostatic energy due to spontaneous ...
Added: February 22, 2017
Goltsman G., Zhang W., Miao W. et al., Superconductor Science and Technology 2014 Vol. 27 No. 8 P. 085013
In this paper we study the temperature dependence of the receiver noise temperature and IF noise bandwidth of superconducting hot electron bolometer (HEB) mixers. Three superconducting NbN HEB devices of different transition temperatures (Tc) are measured at 0.85 THz and 1.4 THz at different bath temperatures (Tbath) between 4 K and 9 K. Measurement results ...
Added: February 24, 2016
Bakurskiy S. V., Klenov N. V., Soloviev I. I. et al., / Cornell University. Series cond-mat "arxiv.org". 2018. No. 1808.07090.
We study the peculiarities in current-phase relations (CPR) of the SIsFS junction in the region of 0 to p
transition. These CPR consist of two independent branches corresponding to 0− and p− states of the contact.
We have found that depending on the transparency of the SIs tunnel barrier the decrease of the s-layer thickness
leads to transformation ...
Added: October 28, 2018
Flokstra M. G., Cunningham T. C., Kim J. et al., Physical Review B: Condensed Matter and Materials Physics 2015 Vol. 91 P. 060501(R)
Transport measurements are presented on thin-film superconducting spin-valve systems, where the controlled noncollinear arrangement of two ferromagnetic Co layers can be used to influence the superconducting state of Nb.We observe a very clear oscillation of the superconducting transition temperature with the relative orientation of the two ferromagnetic layers. Our measurements allow us to distinguish between ...
Added: February 23, 2017
Lusche R., Semenov A., Il'in K. et al., IEEE Transactions on Applied Superconductivity 2013 Vol. 23 No. 3 P. 2200205-1-2200205-5
We present thorough measurements of the intrinsic detection efficiency in the wavelength range from 350 to 2500 nm for meander-type TaN and NbN superconducting nanowire single-photon detectors with different widths of the nanowire. The width varied from 70 nm to 130 nm. The open-beam configuration allowed us to accurately normalize measured spectra and to extract ...
Added: March 13, 2014
Bakurskiy S. V., Klenov N. V., Soloviev I. I. et al., Applied Physics Letters 2018 Vol. 113 No. 082602 P. 082602-1-082602-5
We study the peculiarities in current-phase relations (CPR) of the SIsFS junction in the region of 0
to p transition. These CPR consist of two independent branches corresponding to 0- and p-states of
the contact. We have found that depending on the transparency of the SIs tunnel barrier, the decrease
in the s-layer thickness leads to transformation of ...
Added: October 28, 2018
Heim D., Pugach N., Kupriyanov M. et al., Journal of Physics: Condensed Matter 2013 Vol. 25 P. 215701
We calculate the current-phase relation of a planar Josephson junction with a ferromagnetic weak link located on top of a thin normal metal film. Following experimental observations we assume transparent superconductor–ferromagnet interfaces. This provides the best interlayer coupling and a low suppression of the superconducting correlations penetrating from the superconducting electrodes into the ferromagnetic layer. ...
Added: February 23, 2017
Antipov A., Seleznev V., Vakhtomin Y. et al., IOP Conference Series: Materials Science and Engineering (MSE) 2020 Vol. 781 No. 1 P. 012011-1-012011-5
Spectral characteristics of WSi and NbN superconducting single-photon detectors with different surface resistance and width of nanowire strips have been investigated in the wavelength range of 1.3-2.5 µm. WSi structures with narrower strips demonstrated better performance for detection of single photons in longer wavelength range. The difference in normalized photon count rate for such structures ...
Added: December 10, 2020
Budkov Y., Kolesnikov A. L., Polymer Science - Series C 2018 Vol. 60 No. Supplement 1 P. 148-159
Theoretical models of the conformational behavior of flexible polymer chains in mixed solvents enunciated in the world literature during the last decade are critically reviewed. Models describing different mechanisms of coil-to-globule transitions in a good solvent induced by cosolvent addition are highlighted. Special attention is given to the analysis of theoretical approaches to describing the ...
Added: November 30, 2018
Kalmykov A., Melentiev P., Balykin V., Laser Physics Letters 2020 Vol. 17 No. 4 P. 045901
In this paper we present measurements and comparison of SPP propagation length at the practically important telecom wavelength (1560 nm) as well as in the near-infrared and visible spectral ranges. The measurements were carried out for plane SPP waves excited on Ag film surface using optical microscopy of SPP waves in the far field. We ...
Added: January 15, 2021
M. : Faculty of Physics, MSU, 2017
The Low Temperature Physics Conference is an international event held every three years, under the auspices of the IUPAP through its Commission C5 on Low Temperature Physics. The aim of these conferences is to exchange information and views among the members of the international scientific community in the general field of Low Temperature Physics. It ...
Added: October 1, 2017
Boldyrev K., Романов А., Хаула Е. et al., Journal of the American Ceramic Society 2019 Vol. 102 No. 5 P. 2745-2751
Single crystal of TlCl was doped with NIR photoluminescent univalent bismuth cations by prolonged immersion in liquid bismuth metal. The ion exchange Tl+ + Bi0 ↔ Tl0 + Bi+ at the crystal surface with subsequent Bi+ migration to the bulk are expected to drive the doping process. Contrary with Bi‐doped TlCl crystals, grown by Bridgman method, the ion exchange does ...
Added: February 8, 2019
Казанцев Д. В., Казанцева Е. А., Кузнецов Е. В. et al., Известия РАН. Серия физическая 2017 Т. 81 № 12 С. 1709-1714
Описаны принципы работы безапертурного сканирующего микроскопа ближнего оптического поля (ASNOM). Зондом в приборе служит металлизированная игла атомно-силового микроскопа, и оптическое взаимодействие с объектами на поверхности локализовано вблизи ее острия размером в несколько нанометров. Тело иглы имеет длину в несколько микрон, и это обеспечивает высокую эффективность ее электромагнитного взаимодействия с падающими на нее извне и излучаемыми ...
Added: December 6, 2020
Bodrova A., Osinsky A., Brilliantov N., Scientific Reports 2020 Vol. 10 Article 693
We study analytically and numerically the distribution of granular temperatures in granular mixtures for
different dissipation mechanisms of inelastic inter-particle collisions. Both driven and force-free systems
are analyzed. We demonstrate that the simplified model of a constant restitution coefficient fails to
predict even qualitatively a granular temperature distribution in a homogeneous cooling state. At the
same time we reveal ...
Added: February 25, 2020
Kuzmichev S. A., Kuzmicheva T. E., Tchesnokov S. N. et al., Journal of Superconductivity and Novel Magnetism 2016 Vol. 29 No. 4 P. 1111-1116
We present temperature dependences of the large and the small superconducting gaps measured directly by SnS-Andreev spectroscopy in various Fe-based superconductors and MgB2. The experimental L,S(T ) are wellfitted with a two-gap model based on Moskalenko and Suhl system of equations (supplemented with a BCS integral renormalization). From the fitting procedure, we estimate the key ...
Added: March 19, 2016
Демин А. С., Масляев С. А., Пименов В. Н. et al., Физика и химия обработки материалов 2017 № 6 С. 5-17
Изучено влияние облучения в установке Плазменный фокус PF-1000 экстремальными энергетическими потоками быстрых ионов дейтерия (Ei≈100 кэВ, плотность мощности qi≈1011-1012 Вт/см2, длительность импульса ti≈10-50 нс) и дейтериевой плазмы (qpl≈109- 1010 Вт/см2, tpl≈50-100 нс) на структуру поверхностного слоя молибденовой пластины с учетом его плавления, частичного испарения и закалки расплава. На облученной поверхности обнаружено образование капельных структур, пор, ...
Added: December 25, 2017