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Using Ginzburg-Landau theory, we have performed detailed studies of vorticesin the presence of artificial defect arrays, for a thin film geometry. We showthat when a vortex approaches the vicinity of a defect, an abrupt transitionoccurs in which the vortex core develops a ``string'' extending to the defectboundary, while simultaneously the supercurrents and associated magnetic fluxspread out and engulf the defect. Current induced depinning of vortices isshown to be dominated by the core string distortion in typical experimentalsituations. Experimental consequences of this unusual depinning behavior arediscussed.Comment: 10 pages,9 figure

Deformation and depinning of superconducting vortices from artificial defects: A Ginzburg-Landau study