Title: Pinning effects on the vortex critical velocity in type-II superconducting thin films
Authors: Leo, A ×
Grimaldi, G
Nigro, A
Pace, S
Verellen, Niels
Silhanek, Alejandro
Gillijns, Werner
Moshchalkov, Victor
Metlushko, V
Ilic, B #
Issue Date: Oct-2010
Publisher: Elsevier science bv
Series Title: Physica c-superconductivity and its applications vol:470 issue:19 pages:904-906
Abstract: We study the influence of artificial pinning centers on the vortex critical velocity in Al thin films deposited on top of a periodic array of Permalloy (FeNi) square rings. We demonstrate that the field dependence of the flux flow velocity strongly depends on the particular magnetic state of the rings. In particular, we find that, even when the rings are in a flux closure state, i.e. with little stray field, the vortex critical velocity shows a non-monotonic magnetic field dependence. This behaviour is in sharp contrast with the results obtained in a reference plain film, with no rings underneath. A comparison with the intrinsic strong pinning Nb films previously studied, suggests an interpretation in terms of a channel-like motion of vortices, here induced by the artificial pinning structure. (C) 2010 Elsevier B.V. All rights reserved.
ISSN: 0921-4534
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Solid State Physics and Magnetism Section
× corresponding author
# (joint) last author

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