Physics – Condensed Matter – Superconductivity
Scientific paper
2010-12-09
Supercond. Sci. Technol. 24 (2011) 024018
Physics
Condensed Matter
Superconductivity
15 pages, submitted to Supercond. Sci. Technol., special issue on Hybrid Magnetic/Superconducting Systems
Scientific paper
10.1088/0953-2048/24/2/024018
We present wideband microwave measurements (1-22 GHz) taken on Superconductor/Ferromagnet heterostructures with the Corbino disk technique. We apply the technique to Nb/PdNi/Nb trilayers in the vortex state and we compare the results to data taken with the same technique on a Nb thin film. We show that it is possible to directly extract the genuine flux-flow resistivity from our frequency-dependent measurements without overcoming the (depinning) critical current. The characteristic frequency for vortex relaxation can also be estimated, without resorting to a specific model. We find that the F layer determines a weakening of pinning and an enhancement of the flux-flow resistivity with respect to the Nb film.
Pompeo N.
Sarti S.
Silva Enrico
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