Self-field effects on flux flow in two-dimensional arrays of Nb Josephson junctions

E. Trías; T. P. Orlando; H. S. J. van der Zant

doi:10.1103/PhysRevB.54.6568

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Self-field effects on flux flow in two-dimensional arrays of Nb Josephson junctions

E. Trías, T. P. Orlando, H. S. J. van der Zant

DOI 10.1103/PhysRevB.54.6568 · Physical Review B

T1

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Abstract

Measurements and numerical studies of the self-induced magnetic field effects on flux flow in two-dimensional arrays of niobium Josephson junctions have been performed. It was found that the flux-flow resistance becomes larger as the penetration depth of the array decreases. A phenomenological model, which agrees qualitatively with the experiments and simulations, is presented to explain the self-field effects on flux flow. Due to the smaller spatial extent of supercurrents around a vortex when self-fields are important, both the mass of the vortex and the array viscosity decrease. The decreased mass and viscosity lead to an increase in flux-flow resistance. The effects of spin-wave damping are also discussed for underdamped arrays. Measurements and simulations on the spatial dependence of flux flow indicate that more complex dynamics is involved in the flux-flow regime than a simple linear flow of the vortices.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown