In 1D SF1F2S Josephson junctions, a barrier at the F1/F2 interface creates critical-current resonance peaks at Q_i d_i = (n_i + 1/2)π, attributed to zero-spin-projection triplet pairs, with accumulated phase setting the 0 or π ground state.
From inversion to enhancement of the Josephson current by an exchange field in S/F-I-F/S tunnel structures
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abstract
We study theoretically the dc Josephson tunnel current for a junction of two proximity S/F bilayers of a massive superconductor (S) / a thin ferromagnet (F) separated by an insulating (I) barrier. The dependence of the critical current on the relative orientation of the F layers magnetization is analyzed within the microscopic theory of the proximity effect for an S/F bilayer. We demonstrate that for the S/F-I-F/S contact critical current can reverse its sign (\pi-state of the junction) for the parallel orientation of the F layers magnetization, while for antiparallel alignment an enhancement of the critical current takes place. The results provide a new effect of the interplay between superconductivity and ferromagnetism in hybrid structures.
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Quantized resonant tunneling effect in Josephson junctions with ferromagnetic bilayers
In 1D SF1F2S Josephson junctions, a barrier at the F1/F2 interface creates critical-current resonance peaks at Q_i d_i = (n_i + 1/2)π, attributed to zero-spin-projection triplet pairs, with accumulated phase setting the 0 or π ground state.