Vortex structure in long Josephson junction with two inhomogeneities

TL;DR

This paper presents numerical experiments on long Josephson junctions with inhomogeneities, revealing asymmetric fluxon states and the impact of inhomogeneity position and amplitude on fluxon stability and critical current behavior.

Contribution

It introduces new insights into fluxon state asymmetry and stability influenced by inhomogeneities in long Josephson junctions, supported by numerical analysis.

Findings

Existence of asymmetric fluxon states with one inhomogeneity.

Disappearance of fluxon-antifluxon states when inhomogeneity shifts to junction end.

Inhomogeneity amplitude affects fluxon stability and critical current dependence.

Abstract

A report of numerical experiment results on long Josephson junction with one and two rectangular inhomogeneities in the barrier layer is presented. In case of one inhomogeneity we demonstrate the existence of the asymmetric fluxon states. The disappearance of mixed fluxon-antifluxon states when the position of inhomogeneity shifted to the end of the junction is shown. In case with two inhomogeneities the change of the amplitude of Josephson current through the inhomogeneity at the end of junction makes strong effect on the stability of the fluxon states and smoothes the maximums on the dependence ``critical current - magnetic field''.