Spin Supercurrent, Magnetization Dynamics, and Phi-State in Spin-Textured Josephson Junctions

Abstract

The prospect of combining the dissipationless nature of superconducting currents with the spin-polarization of magnetic materials is interesting with respect to exploring superconducting analogues of topics in spintronics. In order to accomplish this aim, it is pivotal to understand how spin-supercurrents interact dynamically with magnetization textures. We investigate the appearance of a spin-supercurrent and the resulting magnetization dynamics in a textured magnetic Josephson current by using three experimentally relevant models: i) a S/F/S junction with spin-active interfaces, ii) a S/F1/F2/F3/S Josephson junction with a ferromagnetic trilayer, and iii) a Josephson junction containing a domain wall. In all of these cases, the supercurrent is spin-polarized and exerts a spin-transfer torque on the ferromagnetic interlayers which causes magnetization dynamics. Using a scattering matrix formalism in the clean limit, we compute the Andreev-bound states and free energy of the system which is used to solve the Landau-Lifshiftz-Gilbert equation. We compute both how the inhomogeneous magnetism influences the phase-dependence of the charge supercurrent as well as the magnetization dynamics caused by the spin-supercurrent. Using a realistic experimental parameter set, we find that the supercurrent can induce magnetization switching that is controlled by the superconducting phase difference. Moreover, we demonstrate that the combined effect of chiral spin symmetry breaking and interface scattering causes the system to act as a phase battery that may supply any superconducting phase difference phi in the ground state. Such a phi junction is accompanied by an anomalous supercurrent appearing even at zero phase difference, and we demonstrate that the flow direction of this current is controlled by the chirality of the magnetization configuration.

12 pages, 7 figures. Submitted to Phys. Rev. B

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• Anomalous current in diffusive ferromagnetic Josephson junctions
• Triplet proximity effect in superconducting heterostructures with a half-metallic layer
• Generation of a superconducting vortex via Néel skyrmions
• Boosting spintronics with superconductivity
• Fingerprint of topological Andreev bound states in phase-dependent heat transport
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• Generalized quasiclassical theory of the long-range proximity effect and spontaneous currents in superconducting heterostructures with strong ferromagnets
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• Quasiclassical theory for the superconducting proximity effect in Dirac materials
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• Magnon-Cooparons in magnet-superconductor hybrids
• Magnetization induced dynamics of a Josephson junction coupled to a nanomagnet
• Josephson spin-valve realization in the magnetic nodal-line topological semimetal Fe${}_3$GeTe${}_2$
• Magnetization Reversal by Tuning Rashba Spin-Orbit Interaction and Josephson Phase in a Ferromagnetic Josephson Junction
• Supercurrent-Induced Spin-Orbit Torques
• Josephson response of a conventional and a noncentrosymmetric superconductor coupled via a double quantum dot
• Supercurrent-induced Skyrmion dynamics and Tunable Weyl points in Chiral Magnet with Superconductivity
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• Josephson diode and spin-valve effects on the surface of altermagnet CrSb
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