The movie shows the initial penetration of a flux front into a sample with a triangular array of pinning sites. We add vortices at a constant rate to an unpinned region at the left edge of the sample, creating a gradient in vortex density that drives the vortices into the pinned region. Circles represent vortices, and lines are drawn tracing the path each vortex follows through the sample.
The parabolic pins in this sample are in a triangular array at a density of np = 0.44 (Pinning site density) and are all of strength fp = 1.5 (Pinning site strength) Vortices that fall into the strong pinning sites remain pinned for the rest of the movie and repel the other vortices moving through the sample, creating channels of vortex motion between the rows of pinning sites.
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Created by: Cynthia Olson and Jared Groth
Last modified: 12/18/96