Periodic Array of Pinning Sites
High matching fields

The movie illustrates the higher 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 parabolic pins in this sample are in a square array at a density of n_p = 0.19 (Pinning site density) and are all of strength f_p = 5.0 (Pinning site strength) Higher matching fields, up to and including the fourth matching field, are shown. At the higher fields, domains of different vortex lattice orientation can be seen moving through the sample, with domain boundaries marked by dislocations.

Parameters and Notes

• A_p = 5.0 (Pinning strength)
• r_pin = 0.25 (Pinning radius)
• N_pin = 247 (Number of pinning sites)
• Square array of pinning sites.
• Reached approximately 1148 vortices, somewhere above the 4 1/2 matching field.
• Vortices dropped every 300 md steps.
• Movie was written every 650 md steps

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Created by: Cynthia Olson and Jared Groth
Last modified: 12/18/96