The movie illustrates the low matching fields for a square array of pinning sites. Vortices enter the pinning region at the left and right edges of the sample, increasing the vortex density inside the sample.
Circles represent vortices.
The first two matching fields, along with matching fields of less than one, are shown. 600 Number of pinning sites Parabolic triangular pinning Reached approximately 2200 vortices, somewhere past the second matching field. Vortices dropped every 400 md steps.