Local probing of the vortex–antivortex dynamics in superconductor/ferromagnet hybrid structures

Silhanek, Alejandro; Gladilin, V. N.; Vondel, J. Van de; Raes, Bart; Ataklti, G. W.; Gillijns, Werner; Tempere, J.; Devreese, Jozef T.; Moshchalkov, Victor

doi:10.1088/0953-2048/24/2/024007

Cited by 23 publications

(24 citation statements)

References 30 publications

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“…(10)- (12) and the superconductor-insulator boundary conditions, which assure zero values for both the superconducting and normal components of the current across the boundary, is solved numerically using the approach described in Refs. [47,48]. The results are shown in Fig.…”

Section: Time-dependent Ginzburg-landau Simulationsmentioning

confidence: 93%

Flux penetration in a superconducting film partially capped with a conducting layer

et al. 2017

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The influence of a conducting layer on the magnetic flux penetration in a superconducting Nb film is studied by magneto-optical imaging. The metallic layer partially covering the superconductor provides an additional velocity-dependent damping mechanism for the flux motion that helps to protect the superconducting state when thermomagnetic instabilities develop. If the flux advances with a velocity slower than w = 2/μ 0 σ t, where σ is the cap layer conductivity and t is its thickness, the flux penetration remains unaffected, whereas for incoming flux moving faster than w, the metallic layer becomes an active screening shield. When the metallic layer is replaced by a perfect conductor, it is expected that the flux braking effect will occur for all flux velocities. We investigate this effect by studying Nb samples with a thickness step. Some of the observed features, namely the deflection of the flux trajectories at the border of the thick center, as well as the favored flux penetration at the indentation, are reproduced by time-dependent Ginzburg-Landau simulations.

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Section: Time-dependent Ginzburg-landau Simulationsmentioning

confidence: 93%

Flux penetration in a superconducting film partially capped with a conducting layer

et al. 2017

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“…Equation (2) is solved numerically using the approach described in [33] and successfully applied to describe different kinds of vortex dynamics in superconducting condensates (see, e. g., [34,35]). We use a uniform twodimensional grid with the step = = h h 0.5…”

Section: Single Vortex Structurementioning

confidence: 99%

Interaction and motion of vortices in nonequilibrium quantum fluids

Gladilin

Wouters

2017

New J. Phys.

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We study numerically the motion of vortices in nonequilibrium Bose-Einstein condensates, that are described by a generalized Gross-Pitaevskii equation. We analyze how the vortex properties are modified when moving away under deviation from equilibrium. We find that far from equilibrium, the radial component dominates over the azimuthal one in the distribution of vortex currents at large distances from the vortex core. The modification of the current pattern has a strong effect on the vortex-antivortex interaction energy, that can become entirely repulsive. The vortex trajectories are also strongly affected by the driving and dissipation. Self acceleration of vortices is observed in the strong nonequilibrium case.

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“…The equations (4) (5) and (8) are solved self-consistently following the numerical approach described in ref. 45.…”

mentioning

confidence: 99%

Bound vortex dipoles generated at pinning centres by Meissner current

Ge¹,

Gutiérrez²,

Gladilin

et al. 2015

Nat Commun

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One of the phenomena that make superconductors unique materials is the MeissnerOchsenfeld effect. This effect results in a state in which an applied magnetic field is expelled from the bulk of the material because of the circulation near its surface of resistance-free currents, also known as Meissner currents. Notwithstanding the intense research on the Meissner state, local fields due to the interaction of Meissner currents with pinning centres have not received much attention. Here we report that the Meissner currents, when flowing through an area containing a pinning centre, generate in its vicinity two opposite sense current half-loops producing a bound vortex-antivortex pair, which eventually may transform into a fully developed vortex-antivortex pair ultimately separated in space. The generation of such vortex dipoles by Meissner currents is not restricted to superconductors; similar topological excitations may be present in other systems with Meissner-like phases.

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Local probing of the vortex–antivortex dynamics in superconductor/ferromagnet hybrid structures

Cited by 23 publications

References 30 publications

Flux penetration in a superconducting film partially capped with a conducting layer

Flux penetration in a superconducting film partially capped with a conducting layer

Interaction and motion of vortices in nonequilibrium quantum fluids

Bound vortex dipoles generated at pinning centres by Meissner current

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