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High magnetic field matching effects in NbN films induced by template grown dense ferromagnetic nanowires arrays

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7 Author(s)
Hallet, X. ; Unité de Physico-Chimie et de Physique des Matériaux, Université Catholique de Louvain (UCL), Place Croix du Sud 1, B-1348 Louvain-la-Neuve, Belgium ; Matefi-Tempfli, M. ; Michotte, S. ; Piraux, L.
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Dense arrays of ordered ferromagnetic nanowires have been used to create periodic magnetic pinning centers in thin superconducting NbN films. The nanowires were electrodeposited in a highly ordered porous alumina membrane and the thin NbN film was deposited on top of the perpendicularly oriented magnetic nanowires. Matching effects have been observed up to 2.5 T (11th matching field) and are maintained at low temperature. An appreciable enhancement of the superconducting properties is observed. At low fields, a hysteretic behavior in the magnetoresistance is found, directly related to the magnetization processes of arrays of interacting single domain ferromagnetic nanowires.

Published in:

Applied Physics Letters  (Volume:95 ,  Issue: 25 )

Date of Publication:

Dec 2009

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