Depinning of Two-Dimensional Vortex System with Square Pinning Array at the Second Matching Field
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Depinning of a two-dimensional vortex system at the second matching field B=2B ϕ in the presence of square pinning array was studied by molecular dynamics simulations. The annealed ground structures and depinning properties are found to be dependent on pinning strength. For strong pinning, we find a two-step depinning transition with a lower depinning force F c1 and a higher one F c2. At F c1 only the interstitial vortices start to move, while at F c2 the vortices at pinning sites are depinned and all vortices move.
KeywordsVortex Periodic pinning Critical depinning Simulation
This work was supported by the Natural Science Foundation of Zhejiang province under Grant No. Y6090545.