Origin and control of spin currents in a magnetic triplet Josephson junction

Abstract

We study the appearance of a Josephson spin current in a model triplet superconductor junction with a magnetically-active tunnelling barrier. We find three distinct mechanisms for producing a spin current, and we provide a detailed discussion of the symmetry properties and the physical origins of each. By combining these three basic mechanisms, we find that it is possible to exercise fine control over the spin currents. In particular, we show that unlike the charge current, the spin currents on either side of the barrier need not be identical.

arXiv comment5 pages, 4 figures, RevTeX

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• 0-$\pi$ transition in magnetic triplet superconductor Josephson junctions
• Proximity effect with noncentrosymmetric superconductors
• Spin Josephson effect with a single superconductor
• Spontaneous spin current due to triplet superconductor--ferromagnet interfaces
• Spin-Transfer Torque and Magnetoresistance in Superconducting Spin-Valves
• Adiabatic and nonadiabatic spin torques induced by spin-triplet supercurrent
• Microscopic derivation of Ginzburg-Landau equations for coexistent states of superconductivity and magnetism
• Josephson effect between triplet superconductors through a ferromagnetic barrier of finite width
• Control of Edge Currents at a Ferromagnet - Triplet Superconductor Interface by Multiple Helical Majorana Modes
• Tunable ground states in helical $p$-wave Josephson junctions
• Josephson effect in spin-singlet superconductor/ferromagnetic insulator/spin-triplet superconductor junctions with helical $p$-wave states
• Effect of helical edge states on the tunneling conductance in ferromagnet/noncentrosymmetric superconductors junctions
• Tunneling between chiral magnets: Spin current generation without external fields