Pinning effects on the vortex critical velocity in type-II superconducting thin films
| Autor: | Niels Verellen, Victor Moshchalkov, Bojan Ilic, V. V. Metlushko, Angela Nigro, Werner Gillijns, Gaia Grimaldi, Alejandro Silhanek, Antonio Leo, Sandro Pace |
|---|---|
| Rok vydání: | 2010 |
| Předmět: |
Permalloy
Physics Flux pinning Condensed matter physics Magnetic pinning structures Demagnetizing field Energy Engineering and Power Technology flux-flow instability Vorticity vortex dynamics Condensed Matter Physics Critical ionization velocity Electronic Optical and Magnetic Materials Vortex vortex pinning Condensed Matter::Superconductivity Electronic Vortex dynamics Optical and Magnetic Materials magnetic pinning structures Electrical and Electronic Engineering Vortex pinning Pinning force Type-II superconductor |
| Zdroj: | Physica C: Superconductivity. 470:904-906 |
| ISSN: | 0921-4534 |
| Popis: | 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. ispartof: Physica c-superconductivity and its applications vol:470 issue:19 pages:904-906 ispartof: location:GREECE, Rhodes status: published |
| Databáze: | OpenAIRE |
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