London equation studies of thin-film superconductors with a triangular antidot lattice
Sa-Lin Cheng, D. J. Priour, Jr., H. A. Fertig
DOI 10.1103/PhysRevB.65.024503 · Physical Review B
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Abstract
We report on a study of vortex pinning in nanoscale antidot defect arrays in the context of the London theory. Using a wire network model, we discretize the array with a fine mesh, thereby providing a detailed treatment of pinning phenomena. The use of a fine grid has enabled us to examine both circular and elongated defects, patterned in the form of a rhombus. The latter display pinning characteristics superior to circular defects constructed with the similar area. We calculate pinning potentials for defects containing zero and single quanta, and we obtain a pinning phase diagram for the second matching field H=2Φo.
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