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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
Surface effects on the dynamic behavior of vortices in Type II superconducting strips with periodic and conformal pinning arrays
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 (nv) and pinning (np) reaches nv/np = 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 nv/np = 1. However, the depinning force peak is present for only one value of field, in the range of fields where nv/np = 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.
1557-1939
Vizarim, N.P.
916536c2-e7b0-49a8-b622-c7e21febafea
Carlone, M.
4e442c08-d541-4f97-a28f-0204298761dd
Verga, L.G.
681e0d2b-083d-4478-85f6-d2eca7673c24
Venegas, P.A.
87d0c549-737b-4f17-83fb-e40939c57e26
Vizarim, N.P.
916536c2-e7b0-49a8-b622-c7e21febafea
Carlone, M.
4e442c08-d541-4f97-a28f-0204298761dd
Verga, L.G.
681e0d2b-083d-4478-85f6-d2eca7673c24
Venegas, P.A.
87d0c549-737b-4f17-83fb-e40939c57e26

Vizarim, N.P., Carlone, M., Verga, L.G. and Venegas, P.A. (2017) Surface effects on the dynamic behavior of vortices in Type II superconducting strips with periodic and conformal pinning arrays. Journal of Superconductivity and Novel Magnetism. (doi:10.1007/s10948-017-4452-3).

Record type: Article

Abstract

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 (nv) and pinning (np) reaches nv/np = 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 nv/np = 1. However, the depinning force peak is present for only one value of field, in the range of fields where nv/np = 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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Accepted/In Press date: 17 November 2017
e-pub ahead of print date: 25 November 2017

Identifiers

Local EPrints ID: 416671
URI: http://eprints.soton.ac.uk/id/eprint/416671
ISSN: 1557-1939
PURE UUID: b4920430-95e7-4873-8700-59a12f3d54cc
ORCID for L.G. Verga: ORCID iD orcid.org/0000-0002-7453-238X

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Date deposited: 04 Jan 2018 17:30
Last modified: 14 Sep 2021 20:01

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Contributors

Author: N.P. Vizarim
Author: M. Carlone
Author: L.G. Verga ORCID iD
Author: P.A. Venegas

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