Josephson φ-junctions based on structures with complex normal/ferromagnet bilayer

Bakurskiy, S. V.; Klenov, N. V.; Karminskaya, T. Yu.; Kupriyanov, M. Yu.; Golubov, Alexandre Avraamovitch

doi:10.1088/0953-2048/26/1/015005

Cited by 35 publications

(39 citation statements)

References 69 publications

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“…In Refs. [270,271], a planar Josephson junction with a ferromagnetic weak link located on top of a thin normal metal film is considered. It is shown that this Josephson junction is a promising candidate for the realization of a ϕ-junction.…”

Section: ϕ-Josephson Junctionsmentioning

confidence: 99%

Spin-polarized supercurrents for spintronics: a review of current progress

2015

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During the past 15 years a new field has emerged, which combines superconductivity and spintronics, with the goal to pave a way for new types of devices for applications combining the virtues of both by offering the possibility of long-range spin-polarized supercurrents. Such supercurrents constitute a fruitful basis for the study of fundamental physics as they combine macroscopic quantum coherence with microscopic exchange interactions, spin selectivity, and spin transport. This report follows recent developments in the controlled creation of long-range equal-spin triplet supercurrents in ferromagnets and its contribution to spintronics. The mutual proximity-induced modification of order in superconductor-ferromagnet hybrid structures introduces in a natural way such evasive phenomena as triplet superconductivity, odd-frequency pairing, Fulde-Ferrell-Larkin-Ovchinnikov pairing, long-range equal-spin supercurrents, [Formula: see text]-Josephson junctions, as well as long-range magnetic proximity effects. All these effects were rather exotic before 2000, when improvements in nanofabrication and materials control allowed for a new quality of hybrid structures. Guided by pioneering theoretical studies, experimental progress evolved rapidly, and since 2010 triplet supercurrents are routinely produced and observed. We have entered a new stage of studying new phases of matter previously out of our reach, and of merging the hitherto disparate fields of superconductivity and spintronics to a new research direction: super-spintronics.

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Section: ϕ-Josephson Junctionsmentioning

confidence: 99%

Spin-polarized supercurrents for spintronics: a review of current progress

2015

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“…As the result of multiple Andreev reflection the second harmonics sin 2ϕ of supercurrent is generated in SNScontacts [20]. It leads to an anharmonic behavior of the supercurrent dependence on the phase difference (see, e.g., Refs.…”

Section: Introductionmentioning

confidence: 99%

The simulation of current-voltage characteristics and the dynamic conductivity of the ballistic contacts based on superconductors with weak oscillation order parameter

Sergeyev

Shunkeyev

2016

2016 International Siberian Conference on Control and Communications (SIBCON)

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In the framework of the model of multiple Andreev reflections of quasiparticles (Averin-Bardas model) the currentvoltage characteristics and the dI dV -spectra of dynamic conductivity of ballistic contacts "superconductor -normal metal -superconductor" (SNS) in high transparency mode (for D = 0,9÷0,98) were calculated. In this mode the energy gap of superconductors comprising SNS-contact is oscillatory in the energy range 60÷100 meV due to the strong electron-phonon interaction. The features of subharmonic gap structures are revealed in the considered contacts at voltages 4 = 2 4 V e, 5 = 2 5 V e, 6 = 2 6 V e and 7 = 2 7 V e as transforming minimums into maximums at the increase of transparency coefficient from 0,9 to 0,98 (or reduction of the barrier height from 0,33 to 0,144). The results satisfactorily correlate with experimental data.

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“…1b) [11] or (3) a bilayer normal metal/ferromagnet (N/F) with an NF boundary that is oriented along the direction of the passage of the non-dissipative current (Fig. 1c) [12] provides the alternating-sign density of the criticalcurrent under certain conditions. For certain relationships between two strongly different current channels and for quite large, i.e., comparable with the Josephson length, λ j , sizes, the system as an integer behaves as a so-called φ junction, i.e., as a Josephson element, whose phase in the ground state in the absence of the transport current passing through it is ±φ (0 < φ < π) [13].…”

Section: Introductionmentioning

confidence: 99%

Switching between the stable states of a long Josephson φ junction

2015

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This paper describes current transport through а long Josephson junction with an alternating critical-current density. This alternating density can be achieved in experiments bу incorporating a magnetic layer to the weak link in а special manner. The prospects for the practical use of such structures are related to the possibility of obtaining bistable Josephson elements on their basis. Joint analysis of both current-phase relations and dynamic characteristics made it possible to optimize the operation mode for a fast superconducting memory cell based on bistable contact and to assess the energy dissipation for the read and write operations.

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Josephson φ-junctions based on structures with complex normal/ferromagnet bilayer

Cited by 35 publications

References 69 publications

Spin-polarized supercurrents for spintronics: a review of current progress

Spin-polarized supercurrents for spintronics: a review of current progress

The simulation of current-voltage characteristics and the dynamic conductivity of the ballistic contacts based on superconductors with weak oscillation order parameter

Switching between the stable states of a long Josephson φ junction

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