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

Hallet, X.; Mátéfi-Tempfli, M.; Michotte, S.; Piraux, L.; Vanacken, J.; Moshchalkov, V. V.; Mátéfi-Tempfli, S.
December 2009
Applied Physics Letters;12/21/2009, Vol. 95 Issue 25, p252503
Academic Journal
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.


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