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Regular version of the site

Article

Controllable supercurrent in mesoscopic superconductor-normal metal-ferromagnet crosslike Josephson structures

Superconductor Science and Technology. 2021. Vol. 34. No. 9.
Golikova T. E., Wolf M. J., Beckmann D., Penzyakov G. A., Batov I. E., Bobkova I. V., Bobkov A. M., Ryazanov V. V.

A nonmonotonic dependence of the critical Josephson supercurrent on the injection current
through a normal metal/ferromagnet weak link from a single domain ferromagnetic strip has
been observed experimentally in nanofabricated planar crosslike S-N/F-S Josephson structures.
This behavior is explained by 0–π and π–0 transitions, which can be caused by the suppression
and Zeeman splitting of the induced superconductivity due to interaction between N and F
layers, and the injection of spin-polarized current into the weak link. A model considering both
effects has been developed. It shows the qualitative agreement between the experimental results
and the theoretical model in terms of spectral supercurrent-carrying density of states of S-N/F-S
structures and the spin-dependent double-step nonequilibrium quasiparticle distribution.