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

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

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NIKOLIĆ, Danilo, Mihajlo VANEVIĆ, Alexander I. BUZDIN, Zoran RADOVIĆ, 2022. Interference phenomena in Josephson junctions with ferromagnetic bilayers : Spin-triplet correlations and resonances. In: Physical Review B. American Physical Society (APS). 106(5), 054513. ISSN 2469-9950. eISSN 2469-9969. Available under: doi: 10.1103/PhysRevB.106.054513

@article{Nikolic2022Inter-58794, title={Interference phenomena in Josephson junctions with ferromagnetic bilayers : Spin-triplet correlations and resonances}, year={2022}, doi={10.1103/PhysRevB.106.054513}, number={5}, volume={106}, issn={2469-9950}, journal={Physical Review B}, author={Nikolić, Danilo and Vanević, Mihajlo and Buzdin, Alexander I. and Radović, Zoran}, note={Article Number: 054513} }

Interference phenomena in Josephson junctions with ferromagnetic bilayers : Spin-triplet correlations and resonances Radović, Zoran We study the Josephson effect in planar SF<sub>1</sub>F<sub>2</sub>S junctions that consist of conventional s-wave superconductors (S) connected by two metallic monodomain ferromagnets (F<sub>1</sub> and F<sub>2</sub>) with an 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 numerically 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 a 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 the interface between ferromagnetic layers. Vanević, Mihajlo 2022-10-11T13:46:39Z Vanević, Mihajlo Nikolić, Danilo Buzdin, Alexander I. Nikolić, Danilo eng Radović, Zoran 2022 2022-10-11T13:46:39Z Buzdin, Alexander I.

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