Wideband microwave measurements in Nb/Pd${}_{84}$Ni${}_{16}$/Nb structures and comparison with thin Nb films

Abstract

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.

arXiv comment15 pages, submitted to Supercond. Sci. Technol., special issue on Hybrid Magnetic/Superconducting Systems

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• Microwave measurements of the high magnetic field vortex motion pinning parameters in Nb${}_3$Sn
• Robustness of the $0-\pi$ transition against compositional and structural ageing in S/F/S heterostructures
• Surface impedance measurements on Nb${}_3$Sn at high magnetic fields
• Pinning properties of FeSeTe thin film through multifrequency measurements of the surface impedance
• Vortex motion in Nb/PdNi/Nb trilayers: new aspects in the flux flow state
• Microwave properties of Nb/PdNi/Nb trilayers. Observation of flux flow in excess of Bardeen-Stephen theory
• A method based on a dual frequency resonator to estimate physical parameters of superconductors from surface impedance measurements in a magnetic field
• Analysis of the measurements of anisotropic a.c. vortex resistivity in tilted magnetic fields
• Measurements of microwave vortex response in dc magnetic fields in Tl${}_2$Ba${}_2$CaCu${}_2$O${}_{8+x}$ films