Magnetic field of Josephson vortices outside superconductors
Abstract
We consider the structure of Josephson vortices approaching the junction boundary with vacuum in large area Josephson junctions with the Josephson length λJ large relative to the London penetration depth λL. Using the stability argument for one-dimentional solitons with respect to 2D perturbations, it is shown that on the scale λJ the Josephson vortices do not spread near the boundary in the direction of the junction. %, which is in a striking difference with behavior of Abrikosov vortices exiting superconductors. The field distribution in vacuum due to the Josephson vortex is evaluated, the information needed for the Scanning SQUID Microscopy.
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