Abstract
We present wideband microwave measurements (1–22 GHz) taken on superconductor/ferromagnetheterostructures with the Corbino disc technique. We apply the technique to Nb/PdNi/Nbtrilayers in the vortex state and we compare the results to data taken with the sametechnique on a Nb thin film. We show that it is possible to directly extract the genuineflux-flow resistivity from our frequency-dependent measurements without overcoming the(depinning) critical current. The characteristic frequency for vortex relaxation can also beestimated, without resorting to a specific model. We find that the F layer determines aweakening of pinning and an enhancement of the flux-flow resistivity with respect to theNb film.
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