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arXiv · 0706.1638

Josephson current in a superconductor -- ferromagnet -- superconductor junction with in-plane ferromagnetic domains

B. Crouzy·S. Tollis·D. A. Ivanov
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Abstract

We study a diffusive superconductor--ferromagnet--superconductor (SFS) junction with in-plane ferromagnetic domains. Close to the superconducting transition temperature, we describe the proximity effect in the junction with the linearized Usadel equations. We find that properties of such a junction depend on the size of the domains relative to the magnetic coherence length. In the case of large domains, the junction exhibits transitions to the $π$ state, similarly to a single-domain SFS junction. In the case of small domains, the magnetization effectively averages out, and the junction is always in the zero state, similarly to a superconductor--normal metal--superconductor (SNS) junction. In both those regimes, the influence of domain walls may be approximately described as an effective spin-flip scattering. We also study the inhomogeneous distribution of the local current density in the junction. Close to the 0--$π$ transitions, the directions of the critical current may be opposite in the vicinity of the domain wall and in the middle of the domains.

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B. Crouzy, S. Tollis, D. A. Ivanov. 2007-06-12. Josephson current in a superconductor -- ferromagnet -- superconductor junction with in-plane ferromagnetic domains. https://doi.org/10.1103/physrevb.76.134502

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