Abstract
The penetration and further evolution of stiff vortex lines in a superconducting film under a parallel magnetic field is numerically simulated. A square array of in-plane columnar defects is considered as a periodic pinning potential. It is shown that the strong surface effects play an important role in the commensurability between the vortex lattice and the pinning potential. The matching peaks of the magnetization curve are associated to a stable composite vortex lattice in which two distinc vortex lattices are commensurate with the pinning potential.
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