Triplet proximity effect in superconductor/ferromagnet/ferromagnet/ferromagnet/superconductor Josephson junctions

Chen, Chao; Jin, Biao

doi:10.1016/j.physc.2021.1353921

Cited by 3 publications

(1 citation statement)

References 19 publications

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“…In the case of strong ferromagnets the short-range components are suppressed and the second harmonic is dominant in the current-phase relation. Odd harmonic amplitudes can be long-ranged only in heterojunctions with three or more ferromagnetic layers [31][32][33][34][35][36][37][38][39][40][41][42][43].…”

Section: Introductionmentioning

confidence: 99%

Interference phenomena in clean Josephson junctions with ferromagnetic bilayers: Spin-triplet correlations and resonances

Nikolić,

Vanević,

Buzdin

et al. 2022

Preprint

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We study the Josephson effect in planar SF1F2S junctions that consist of conventional s-wave superconductors (S) connected by two metallic monodomain ferromagnets (F1 and F2) with arbitrary transparency of interfaces. We solve the scattering problem in the clean limit based on the Bogoliubov -de Gennes equation for both spin-singlet and odd in frequency spin-triplet pairing correlations. We calculate the Josephson current-phase relation I(φ). While the first harmonic of I(φ) is completely generated by spin-singlet and short-range spin-triplet superconducting correlations, for noncollinear magnetizations of ferromagnetic layers the second harmonic has an additional long-range spin-triplet component. Therefore, for strong ferromagnetic influence, the long-range spin-triplet contribution to the second harmonic dominates. We find an exception due to the geometric resonance for equal ferromagnetic layers when the first harmonic is strongly enhanced. Both first and second harmonic amplitudes oscillate with ferromagnetic layer thicknesses due to 0 − π transitions. We study the influence of interface transparencies and find additional resonances for finite transparency of interface between ferromagnetic layers.

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