Vortex dynamics in mesoscopic strips

Abstract

Flux penetration and vortex patterns in narrow superconducting strips are studied. The edge barrier, vortex–vortex interactions, and the position dependent effective flux are calculated assuming the high-κ limit and strip width ξ≪W≪Λ, where Λ is the effective penetration depth and ξ the coherence length. Vortex penetration and time-evolution inside the sample, as an external magnetic field is looped, are simulated by numerically solving the coupled Langevin equations of motion. The edge barrier shows to have an important role on the system dynamics, producing metastable vortex-chain states.