Flux penetration, matching effect, and hysteresis in homogeneous superconducting films

Silva, Clécio C. de Souza; Cabral, Leonardo R.E.; Aguiar, J. Albino

doi:10.1103/physrevb.63.134526

Cited by 25 publications

(22 citation statements)

References 9 publications

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“…In these cases, the size effects play an important role. With this purpose, several authors investigated theoretically finite and semi-finite size systems with diverse geometries, using the Ginzburg-Landau [64][65][66][67][68][69][70][71][72][73][74][75] and London approach [76][77][78][79][80]. However, there are still open questions about critical depinning currents and vortex behavior in such systems, specially under the influence of pinning arrays.…”

Section: Introductionmentioning

confidence: 99%

“…For the particular case of superconducting strips, some works had been conducted investigating vortex states, critical currents, and magnetization curves [76][77][78][79][82][83][84][85][86][87][88][89][90]. In strips, vortices arrange themselves in chains of straight vortex lines due to the geometrical constraint [76], and the magnetization curves present several peaks, indicating the vortex lattice transitions with formation or destruction of the vortex chains [78,88].…”

Section: Introductionmentioning

confidence: 99%

“…In strips, vortices arrange themselves in chains of straight vortex lines due to the geometrical constraint [76], and the magnetization curves present several peaks, indicating the vortex lattice transitions with formation or destruction of the vortex chains [78,88]. However, there are only few works investigating vortex dynamics under the influence of pinning centers in strips [72,77,86].…”

Section: Introductionmentioning

confidence: 99%

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Surface Effects on the Dynamic Behavior of Vortices in Type II Superconducting Strips with Periodic and Conformal Pinning Arrays

Vizarim

Carlone

Verga

et al. 2017

J Supercond Nov Magn

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Using molecular dynamics techniques, we simulate the vortex behavior in a type II superconducting strip in the presence of triangular and two types of conformal pinning arrays, one with a pinning gradient perpendicular to the driving force (C1) and the other parallel (C2), at zero temperature. A transport force is applied in the infinite direction of the strip, and the magnetic field is increased until the rate between the density of vortices (n v ) and pinning (n p ) reaches n v /n p = 1.5. Our results show a monotonic increase, by steps, of the vortex density with the applied magnetic field. Besides, each pinning lattice presents a different vortex penetration delay. For the triangular pinning array, different than the case of infinite films, here the system exhibits only one pronounced depinning force peak at n v /n p = 1. However, the depinning force peak is present for only one value of field, in the range of fields where n v /n p = 1 is stable. For the case of conformal pinning arrays, in analogy to what is observed in infinite films, no commensurability depinning force peaks were found. In the present case, the C1 array is more efficient at low fields, all arrays are equivalent in the intermediate fields, and the C2 array is more efficient for high fields. We also show that for the C1 array at high fields, vortices depin following the conformal arches, from the edge to the center. For the C2 array, the depinning force is higher when compared to that of C1, because this particular conformal structure prevents the formation of easy vortex flow channels.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Surface Effects on the Dynamic Behavior of Vortices in Type II Superconducting Strips with Periodic and Conformal Pinning Arrays

Vizarim

Carlone

Verga

et al. 2017

J Supercond Nov Magn

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“…A vortex is allowed to enter the sample and participate on the dynamics if it satisfies a force balance condition near one of the sample surfaces. The procedure is the same adopted in earlier publications [14,15,16]: at each time step a test vortex is placed in a random position a distance ξ from one of the sample interfaces and the total force acting on it is calculated. If this force points to the sample interior, the vortex is accepted, otherwise it is rejected.…”

Section: Langevin Dynamics and Simulation Schemementioning

confidence: 99%

“…In the course of our recent research with mesoscopic superconductors [14,15,16] we have been studying the vortex dynamics, within the London approximation, in films, multilayers, and strips, submitted to an external magnetic field and dc currents. In this article we present new results for mesoscopic rectangles in the presence of an applied magnetic field.…”

Section: Introductionmentioning

confidence: 99%

Vortex configurations and metastability in mesoscopic superconductors

Silva

Cabral

Aguiar

2004

Physica C: Superconductivity

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The vortex dynamics in mesoscopic superconducting cylinders with rectangular cross section under an axially applied magnetic field is investigated in the multivortex London regime. The rectangles considered range from a square up to an infinite slab. The flux distribution and total flux carried by a vortex placed in an arbitrary position of the sample is calculated analytically by assuming Clem's solution for the vortex core. The Bean-Livingston energy barrier is also analytically calculated in this framework. A Langevin algorithm simulates the flux penetration and dynamical evolution of the vortices as the external field is slowly cycled. The simulated magnetization process is governed by metastable states. The magnetization curves are hysteretic, with paramagnetic response in part of the downward branch, and present a series of peaks corresponding to the entry or expulsion of a single vortex. For elongated rectangles, the vortices arrange themselves into parallel vortex chains and an additional modulation of the magnetization, corresponding to creation or destruction of a vortex chain, comes out.

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Vortex Dynamics in Superconducting Films: Comensurability and Surface Effects

Silva

Cabral

Aguiar

2001

phys. stat. sol. (a)

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The penetration and further evolution of stiff vortex lines in a superconducting film under a parallel magnetic field is numerically simulated. A square array of in-plane columnar defects is considered as a periodic pinning potential. It is shown that the strong surface effects play an important role in the commensurability between the vortex lattice and the pinning potential. The matching peaks of the magnetization curve are associated to a stable composite vortex lattice in which two distinc vortex lattices are commensurate with the pinning potential.

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Flux penetration, matching effect, and hysteresis in homogeneous superconducting films

Cited by 25 publications

References 9 publications

Surface Effects on the Dynamic Behavior of Vortices in Type II Superconducting Strips with Periodic and Conformal Pinning Arrays

Surface Effects on the Dynamic Behavior of Vortices in Type II Superconducting Strips with Periodic and Conformal Pinning Arrays

Vortex configurations and metastability in mesoscopic superconductors

Vortex Dynamics in Superconducting Films: Comensurability and Surface Effects

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