Ballistic spin transport in the presence of interfaces with strong spin-orbit coupling

Abstract

The inversion symmetry breaking at the interface between different materials generates a strong interfacial spin-orbit coupling (ISOC) that may influence the spin and charge transport in hybrid structures. Here we use a simple analytically solvable model to study in the ballistic approximation various spin transport phenomena induced by ISOC in a bilayer metallic system. In this model a non-equilibrium steady state carrying a spin current is created by applying a spin dependent bias across the metallic junction. Physical observables are then calculated using the scattering matrix approach. In particular we calculate the absorption of the spin current at the interface (the interface spin-loss) and study the interface spin-to-charge conversion. The latter consists of an in-plane interface charge current generated by the spin dependent bias applied to the junction, which can be viewed as a spin galvanic effect mediated by ISOC. Finally we demonstrate that ISOC leads to an interfacial spin current swapping, that is, the "primary" spin current flowing through the spin-orbit active interface is necessarily accompanied with a "secondary' swapped spin current flowing along the interface and polarized in the direction perpendicular to that of the "primary" current. Using the exact spin continuity equation we relate the swapping effect to the intefacial spin-loss, and argue that this effect is generic and independent on the ballistic approximation used for specific calculations.

References in corpus (16)

• Dissipationless Quantum Spin Current at Room Temperature
• Direct electronic measurement of the spin Hall effect
• Current-Induced Polarization and the Spin Hall Effect at Room Temperature
• Spin-Hall effect in a disordered 2D electron-system
• Quasiclassical approach to the spin-Hall effect in the two-dimensional electron gas
• Spin-orbit torques from interfacial spin-orbit coupling for various interfaces
• Non-Abelian gauge fields in the gradient expansion: generalized Boltzmann and Eilenberger equations
• Generation of spin currents and spin densities in systems with reduced symmetry
• Theory of coupled spin-charge transport due to spin-orbit interaction in inhomogeneous two-dimensional electron liquids
• Current-induced spin polarization at the surface of metallic films: a theorem and an ab initio calculation
• On the nature of steady states of spin distributions in the presence of spin-orbit interactions
• Spin-Hall Conductivity and Electric Polarization in Metallic Thin Films
• Giant Extrinsic Spin Hall Effect due to Rare-Earth Impurities
• Spin current swapping and Hanle spin Hall effect in the two dimensional electron gas
• Spin orientation and spin-Hall effect induced by tunneling electrons
• Current and strain-induced spin polarization in InGaN/GaN superlattices

Cited by in corpus (8)

• Spin-orbit torques in heavy metal/ferromagnet bilayers with varying strength of interfacial spin-orbit coupling
• Fully Spin-transparent magnetic interfaces enabled by insertion of a paramagnetic NiO layer
• Spin-orbit torques from interfacial spin-orbit coupling for various interfaces
• Enhancement of spin transparency by interfacial alloying
• Lateral heterostructures and one-dimensional interfaces in 2D transition metal dichalcogenides
• Boundary conditions for spin and charge diffusion in the presence of interfacial spin-orbit coupling
• Spin-memory loss induced by bulk spin-orbit coupling at ferromagnet/heavy-metal interfaces
• Quantification of interfacial spin-charge conversion in metal/insulator hybrid structures by generalized boundary conditions