Re-entrant superconductivity in the superconductor/ferromagnet V/Fe layered system

Гарифуллин, И. А.; Тихонов, Д. А.; Garif’yanov, N. N.; Lazar, Lukáš; Goryunov, Yu. V.; Khlebnikov, Sergei; Тагиров, Л. Р.; Westerholt, K.; Zabel, H.

doi:10.1103/physrevb.66.020505

Cited by 109 publications

(82 citation statements)

References 19 publications

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“…Note, that critical temperature has reentrant behavior. The same type of T d c f ( ) dependence was firstly predicted by us [8,9], and it was observed in the Fe/V/Fe trilayer not long ago [17].…”

Section: Discussion Of the Phase Diagrams Of Layered F/s Systemssupporting

confidence: 56%

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Adjustment of superconductivity and ferromagnetism in few-layered ferromagnet-superconductor nanostructures

Izyumov

Khusainov

Proshin

2006

Low Temperature Physics

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The phase diagrams of the few-layered nanosystems consisting of dirty superconducting (S) and ferromagnetic (F) metals are investigated within the framework of the modern theory of the proximity effect taking into account the boundary conditions. The F/S tetralayer and pentalayer are shown to have considerably richer physics than the F/S bi-and trilayer (due to the interplay between the 0 and p phase superconductivity and the 0 and p phase magnetism and nonequivalence of layers) and even the F/S superlattices. It is proven that these systems can have different critical temperatures and fields for different S layers. This predicted decoupled superconductivity is found to manifest itself in its most striking way for F/S tetralayer. It is shown that F/S/F¢/S¢ tetralayer is the most perspective candidate for use in superconducting spin nanoelectronics. PACS

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Section: Discussion Of the Phase Diagrams Of Layered F/s Systemssupporting

confidence: 56%

“…The reentrant character of superconductivity that we have predicted has been recently observed experimentally in the Fe/V/Fe trilayer [17].…”

Section: Introductionmentioning

confidence: 57%

Adjustment of superconductivity and ferromagnetism in few-layered ferromagnet-superconductor nanostructures

Izyumov

Khusainov

Proshin

2006

Low Temperature Physics

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“…5,6 In this state, the real part of the order parameter penetrates the ferromagnet a distance on the order of the coherence length ξ F and oscillates due to dephasing by the exchange energy of the ferromagnet. This leads to the oscillations of the superconducting transition temperature (T c ) as a function of ferromagnet thickness [7][8][9][10][11] and π phase shift in S/F junctions. 12,13 Furthermore, recent measurements in S/F structures 11,[14][15][16] have provided evidence for triplet pairing in the ferromagnet induced by noncollinear magnetizations of the F layers.…”

Section: Introductionmentioning

confidence: 99%

Vortex flipping in superconductor/ferromagnet spin-valve structures

et al. 2013

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We report in-plane magnetization measurements on Ni/Nb/Ni/CoO and Co/Nb/Co/CoO spin valve structures with one of the ferromagnetic layers pinned by an antiferromagnetic layer. In samples with Ni below the superconducting transition T c , our results show strong evidence of vortex flipping driven by ferromagnet magnetization. This is a direct consequence of the proximity effect that leads to vortex supercurrent leakage into the ferromagnets. Here, the polarized electron spins are subject to the vortices' magnetic field, occasioning vortex flipping. Such a novel mechanism has been made possible by fabrication of the ferromagnet/superconductor/ferromagnet/antiferromagnet multilayered spin valves with an S layer thin enough to barely confine vortices inside as well as F layers thin enough to align and control magnetization within the plane. When Co is used, the vortex flipping effect is not observed. This is attributed to the shorter coherence length of Co. Interestingly, a reduction in the pinning field of about 400 Oe is observed instead when the Nb layer is in the superconducting state. This effect cannot be explained in terms of vortex fields. In view of these facts, any explanation must be directly related to the proximity effect and thus a remarkable phenomenon that deserves further investigation.

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“…The exchange field introduces a momentum mismatch between the spin-up and spin-down electrons that form a singlet pair, and this results in a weak oscillatory dependence superimposed on the decrease of T C with increasing thickness of the F layer [2][3][4] . In an F-S-F spin valve, the reversal of one F layer modifies the spatial properties of the decaying oscillation, resulting in a spin-switch effect in which the T C is greater when the F layer moments are antiparallel (AP) than when they are parallel (P) [5][6][7] .…”

mentioning

confidence: 99%

Evidence for spin selectivity of triplet pairs in superconducting spin valves

et al. 2014

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Spin selectivity in a ferromagnet results from a difference in the density of up-and down-spin electrons at the Fermi energy as a consequence of which the scattering rates depend on the spin orientation of the electrons. This property is utilized in spintronics to control the flow of electrons by ferromagnets in a ferromagnet (F1)/normal metal (N)/ferromagnet (F2) spin valve, where F1 acts as the polarizer and F2 the analyser. The feasibility of superconducting spintronics depends on the spin sensitivity of ferromagnets to the spin of the equal spintriplet Cooper pairs, which arise in superconductor (S)-ferromagnet (F) heterostructures with magnetic inhomogeneity at the S-F interface. Here we report a critical temperature dependence on magnetic configuration in current-in-plane F-S-F spin valves with a holmium spin mixer at the S-F interface providing evidence of a spin selectivity of the ferromagnets to the spin of the triplet Cooper pairs.

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Re-entrant superconductivity in the superconductor/ferromagnet V/Fe layered system

Cited by 109 publications

References 19 publications

Adjustment of superconductivity and ferromagnetism in few-layered ferromagnet-superconductor nanostructures

Adjustment of superconductivity and ferromagnetism in few-layered ferromagnet-superconductor nanostructures

Vortex flipping in superconductor/ferromagnet spin-valve structures

Evidence for spin selectivity of triplet pairs in superconducting spin valves

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