High field matching effects in superconducting Nb porous arrays catalyzed from anodic alumina templates

W. Vinckx, J. Vanacken, V.V. Moshchalkov, Stefan Mátéfi-Tempfli, M. Mátéfi-Tempfli, S. Michotte, L. Piraux, Xiuxiu Ye

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Abstrakt

Vortex pinning in a superconducting Nb thin film deposited on an anodically grown alumina template is investigated. Anodic oxidation of aluminium layers permits under specific conditions the formation of highly ordered porous alumina, a membrane-like structure consisting of triangular arrays of parallel pores. Its pore diameter and interpore distance are set by careful tuning of the anodization parameters. A superconducting Nb thin film is deposited directly onto the alumina film. The porous alumina acts as a template and it allows Nb to form a periodic pinning array during its growth. Pinning force vs. field measurements derived from magnetization measurements, show matching effects in fields up to 1 T. We demonstrate that the anodic alumina template with 50 nm interpore spacing provides enhanced vortex pinning in a large field and temperature range.
OriginalsprogEngelsk
TidsskriftPhysica C: Superconductivity and its Applications
Vol/bind459
Udgave nummer1-2
Sider (fra-til)5-10
Antal sider6
ISSN0921-4534
DOI
StatusUdgivet - 1. aug. 2007

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