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Alternative mechanism of the sign-reversal effect in superconductor-ferromagnet-superconductor Josephson junctions

A. F. Volkov·A. Anishchanka
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Abstract

We consider a simple model of a multidomain superconductor-ferromagnet-superconductor (SFS) Josephson junction. Sign-alternating magnetization $M$ in domains leads to a spatial modulation of the phase difference $ϕ(x)$. Due to this modulation the Josephson critical current $I_{c}$ may have a different sign depending on the ratio of the magnetic flux in a domain, 4$πMa(2d_{F}),$ to the magnetic flux quantum. This phase modulation, but not a nonmonotonic dependence of the local critical current density $j_{c}$, may be the reason for oscillations of the current $I_{c}$ {\bf \}as a function of the F layer thickness $2d_{F} $ or temperature, observed in experiments.

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A. F. Volkov, A. Anishchanka. 2004-11-15. Alternative mechanism of the sign-reversal effect in superconductor-ferromagnet-superconductor Josephson junctions. https://doi.org/10.1103/physrevb.71.024501

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