Abstract

Experiments have been performed on thin films with the magnetic field applied parallel to the sample current (the force-free state). Plots of the flux-flow critical current versus magnetic field show a pronounced temperature independent structure which is sensitive to the film thickness. This structure is interpreted in terms of flux vortex arrangements that are matched to the sample geometry. A flux-cutting model for the dynamic behavior of vortices in this system is proposed and shown to be in qualitative agreement with the results.

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