Abstract
The dynamics of flux vortices in 0.7 mu m thick Nb films have been investigated using a linear array of 2*2 mu m2 Hall probes that can resolve single vortices. The flux vortices move into and out of the centre of the film in bundles. The flux bundle radius has been measured directly by a coincidence technique, and was found to decrease from 3.4 mu m to 1.6 mu m as temperature increased from 4.5 K to 6.5 K. We have observed the onset of flux creep driven by an applied DC current, thus determining the pinning force at individual pinning sites and establishing that pinning force fp alpha (1-T/Tc)n with n=0.52+or-0.05. The temperature dependence of the flux bundle radius can be described by the collective pinning theory of Larkin and Ovchinnikov, taking into account the measured temperature dependence of the pinning force.
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