科研之友
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摘要
Depinning of a two-dimensional vortex system at the second matching field B = 2 B phi 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.
- 出版日期2013-6
- 单位丽水学院; 浙江大学
