PAJOVIC, Z.; BOZOVIC, M.; RADOVIC, Z.; BUZDIN, Alexandre I.; CAYSSOL, Jérôme

doi:10.1103/PhysRevB.74.184509

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PAJOVIC, Z.
Department of Physics

BOZOVIC, M.
Department of Physics

RADOVIC, Z.
Department of Physics

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Physical Review B: Condensed Matter and Materials Physics (1998-2015). 2006, vol. 74, n° 18, p. 184509 (7)

American Physical Society

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We study the Josephson effect in clean heterojunctions that consist of superconductors connected through two metallic ferromagnets with insulating interfaces. We solve the scattering problem based on the Bogoliubov--de Gennes equation for any relative orientation of in-plane magnetizations, arbitrary transparency of interfaces, and mismatch of Fermi wave vectors. Both spin singlet and triplet superconducting correlations are taken into account, and the Josephson current is calculated as a function of the ferromagnetic layers thicknesses and of the angle $\alpha$ between their magnetizations. We find that the critical Josephson current $I_c$ is a monotonic function of $\alpha$ when the junction is far enough from $0-\pi$ transitions. This holds when ferromagnets are relatively weak. For stronger ferromagnets, variation of $\alpha$ induces switching between 0 and $\pi$ states and $I_c(\alpha)$ is non-monotonic function, displaying characteristic dips at the transitions. However, the non-monotonicity is the effect of a weaker influence of the exchange potential in the case of non-parallel magnetizations. No substantial impact of spin-triplet superconducting correlations on the Josephson current has been found in the clean limit. Experimental control of the critical current and $0-\pi$ transitions by varying the angle between magnetizations is suggested.< Réduire

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Josephson coupling through ferromagnetic heterojunctions with noncollinear magnetizations

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