Current-phase relation in Josephson junction coupled with a magnetic dot

Abstract

The current-phase relation (CPR) for a short Josephson junction placed in the nonuniform field of a small ferromagnetic particle is studied. The effect of the particle produced on the junction appears to be strong due to the formation of the pair of oppositely directed Abrikosov vortices which pierce the thin film superconducting electrode and cause a small--scale inhomogeneity of Josephson phase difference. The induced phase difference inhomogeneity is shown to result in the nonzero fixed phase drop ${\varphi }_0$ across the junction. The equilibrium value ${\varphi }_0$ corresponding to the ground state of the junction depends the configuration of the vortex--antivortex pair. The possibility to tune the ground state phase difference ${\varphi }_0$ is discussed.

6 pages, 5 figures

References in corpus (6)

• Proximity effects in superconductor-ferromagnet heterostructures
• Direct coupling between magnetism and superconducting current in Josephson Phi junction
• Josephson junctions with negative second harmonic in the current-phase relation: properties of novel varphi-junctions
• 0-pi Josephson tunnel junctions with ferromagnetic barrier
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