Figure 4: Simulation results.
From: Bound vortex dipoles generated at pinning centres by Meissner current
(a) Variations of mean free path l in a 20 × 20 μm2 superconductor with six pinning sites. Scale bar, 5μm. (b) Magnetic field in the superconductor after performing zero-field cooling followed by an increase of the applied field to B0=0.05μ0Hc2. At all the six pinning sites, vortex dipoles appear due to distortions of the Meissner current flowing along the borders. (c,d) The distribution of squared order parameter and the magnetic field, respectively, in the superconductor cooled at B0=0.05μ0Hc2. Vortex clusters are formed at the defined pinning sites.
