High field matching effects in superconducting Nb porous arrays catalyzed from anodic alumina templates
(2007) Physica C: Superconductivity and its Applications — Vol. 459, n° 1-2, p. 5-10 (2007)
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- Abstract
- 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. (C) 2007 Elsevier B.V. All rights reserved.
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Vinckx, W., Vanacken, J., Moshchalkov, V. V., Mátéfi-Tempfli, S., Mátéfi-Tempfli, M.-R., Michotte, S., Piraux, L., & Ye, X. (2007). High field matching effects in superconducting Nb porous arrays catalyzed from anodic alumina templates. Physica C: Superconductivity and its Applications, 459(1-2), 5-10. https://doi.org/10.1016/j.physc.2007.04.194 (Original work published 2007)