Josephson current and $\pi -$state in ferromagnet with embedded superconducting nanoparticles

Abstract

On the basis of Usadel equations we investigate superconductor/ferromagnet/superconductor (S/F/S) hybrid systems which consist of superconducting nanostructures (spheres, rods) embedded in ferromagnetic metal. The oscillations of the critical current of the S/F/S Josephson junctions with the thickness of ferromagnetic spacer between superconducting electrodes are studied. We demonstrate that the $\pi$ state can be realized in such structures despite of a dispersion of the distances between different parts of the electrodes. The transitions between 0 and $\pi$ states at some thickness of ferromagnetic spacer can be triggered by temperature variation.

16 pages, 5 figures, Submitted to Superconductor Science and Technology

References in corpus (3)

• Implementation of superconductor-ferromagnet-superconductor pi-shifters in superconducting digital and quantum circuits
• High quality ferromagnetic 0 and pi Josephson tunnel junctions
• Striking properties of Superconductor/Ferromagnet structures with spin-dependent scattering