Article (Scientific journals)
Pinning effects on the vortex critical velocity in type-II superconducting thin films
Leo, A.; Grimaldi, G.; Nigro, A. et al.
2010In Physica C. Superconductivity, 470 (19), p. 904-906
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Keywords :
Vortex dynamics; Vortex pinning; Magnetic pinning structures
Abstract :
[en] 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.
Disciplines :
Physics
Author, co-author :
Leo, A.
Grimaldi, G.
Nigro, A.
Pace, S.
Verellen, N.
Silhanek, Alejandro  ;  Katholieke Universiteit Leuven - KUL
Gillijns, W.
Moshchalkov, V. V.
Metlushko, V.
Ilic, B.
Language :
English
Title :
Pinning effects on the vortex critical velocity in type-II superconducting thin films
Publication date :
2010
Journal title :
Physica C. Superconductivity
ISSN :
0921-4534
eISSN :
1873-2143
Publisher :
Elsevier Science, Amsterdam, Netherlands
Special issue title :
SI
Volume :
470
Issue :
19
Pages :
904-906
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 10 November 2011

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