Josephson effect in SIFS-tunnel junctions with domain walls in weak link region

Abstract

We study theoretically the properties of SIFS type Josephson junctions composed of two superconducting (S) electrodes separated by an insulating layer (I) and a ferromagnetic (F) film consisting of periodic magnetic domains structure with antiparallel magnetization directions in neighboring domains. The two-dimensional problem in the weak link area is solved analytically in the framework of the linearized quasiclassical Usadel equations. Based on this solution, the spatial distributions of the critical current density, $J_C,$ in the domains and critical current, $I_C,$ of SIFS structures are calculated as a function of domain wall parameters, as well as the thickness, $d_F,$ and the width, $W,$ of the domains. We demonstrate that $I_C(d_F,W)$ dependencies exhibit damped oscillations with the ratio of the decay length, ${\xi }_1,$ and oscillation period, ${\xi }_2,$ being a function of the parameters of the domains, and this ratio may take any value from zero to unity. Thus, we propose a new physical mechanism that may explain the essential difference between ${\xi }_1$ and ${\xi }_2$ observed experimentally in various types of SFS Josephson junctions.

The paper will be published in JETP letters vol 101, issue 11, 2015

References in corpus (14)

• Critical Current Oscillations in Strong Ferromagnetic Pi-Junctions
• Josephson tunnel junctions with strong ferromagnetic interlayer
• Effect of an inhomogeneous exchange field on the proximity effect in disordered superconductor-ferromagnet hybrid structures
• Striking properties of Superconductor/Ferromagnet structures with spin-dependent scattering
• Odd triplet superconductivity in superconductor-ferromagnet structures with a narrow domain wall
• Josephson current in diffusive multilayer superconductor/ferromagnet/superconductor junctions
• Josephson current in a superconductor-ferromagnet junction with two non-collinear magnetic domains
• Proximity Induced Vortices and Long-Range Triplet Supercurrents in Ferromagnetic Josephson Junctions and Spin Valves
• Josephson current in a superconductor -- ferromagnet -- superconductor junction with in-plane ferromagnetic domains
• Domain wall effects in ferromagnet-superconductor structures
• Andreev conductance of a domain wall
• Long Range Triplet Josephson Current and $0-\pi$ Transition in Tunable Domain Walls
• Enhanced superconducting proximity effect in clean ferromagnetic domain structures
• Long-Range Triplet Supercurrents Induced by Singlet Supercurrents Parallel to Magnetic Interfaces

Cited by in corpus (3)

• Critical Current Oscillations of Elliptical Josephson Junctions with Single-Domain Ferromagnetic Layers
• The effect of normal metal layers in ferromagnetic Josephson junctions
• The physics of superconductor-ferromagnet hybrid structures