We present wideband microwave measurements (1–22 GHz) taken on. superconductor/ferromagnet heterostructures with the Corbino disc 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.
Silva, E., Pompeo, N., Sarti, S. (2011). Wideband microwave measurements in Nb/Pd(84)Ni(16)/Nb structures and comparison with thin Nb films. SUPERCONDUCTOR SCIENCE & TECHNOLOGY, 24(2), 024018-1-024018-8 [10.1088/0953-2048/24/2/024018].
Wideband microwave measurements in Nb/Pd(84)Ni(16)/Nb structures and comparison with thin Nb films
SILVA, Enrico;POMPEO, NICOLA;
2011-01-01
Abstract
We present wideband microwave measurements (1–22 GHz) taken on. superconductor/ferromagnet heterostructures with the Corbino disc 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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
