Skew-scattering-induced giant antidamping spin-orbit torques: Collinear and out-of-plane Edelstein effects at two-dimensional material/ferromagnet interfaces

Abstract

Heavy metal/ferromagnet interfaces feature emergent spin-orbit effects absent in the bulk materials. Because of their inherent strong coupling between spin, charge and orbital degrees of freedom, such systems provide a platform for technologically sought-after spin-orbit torques (SOTs). However, the microscopic origin of purely interfacial antidamping SOT, especially in the ultimate atomically thin limit, has proven elusive. Here, using two-dimensional (2D) van der Waals materials as a testbed for interfacial phenomena, we address this problem by means of a microscopic framework accounting for band structure effects and impurity scattering on equal footing and nonperturbatively. A number of unconventional and measurable effects are predicted, the most remarkable of which is a giant enhancement of antidamping SOT in the dilute disorder limit induced by a robust skew scattering mechanism, which is operative in realistic interfaces and does not require magnetic impurities. The newly unveiled skew scattering mechanism activates rich semiclassical spin-charge conversion effects that have gone unnoticed in the literature, including a collinear Edelstein effect with nonequilibrium spin polarization aligned with the direction of the applied current.

arXiv comment11 pages, 6 figures, appendices included; accepted version (title and main text updated)

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• Twist Angle Controlled Collinear Edelstein Effect in van der Waals Heterostructures
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• Efficient Spin-Orbit Torque Generation in Semiconducting WTe2 with Hopping Transport
• Spin-orbit and exchange proximity couplings in graphene/1T-TaS${}_2$ heterostructure triggered by a charge density wave
• Topological nature of the proper spin current and the spin-Hall torque
• High-resolution real-space evaluation of the self-energy operator of disordered lattices: Gade singularity, spin-orbit effects and p-wave superconductivity
• Spin Hall and inverse spin galvanic effects in graphene with strong interfacial spin-orbit coupling: a quasi-classical Green's function approach
• Spin Hall Effect: Symmetry Breaking, Twisting, and Giant Disorder Renormalization
• Interfacial Spin-Orbit Torques and Magnetic Anisotropy in WSe${}_2$/Permalloy Bilayers
• Nonperturbative approach to interfacial spin-orbit torques induced by Rashba effect
• Giant Valley-Polarized Spin Splittings in Magnetized Janus Pt Dichalcogenides
• Theory of spin-charge-coupled transport in proximitized graphene: An SO(5) algebraic approach
• The Role of Self-Torques in Transition Metal Dichalcogenide/Ferromagnet Bilayers
• Weak Localisation Driven by Pseudospin-Spin Entanglement
• Interfacial spin-orbit-coupling-induced strong spin-to-charge conversion at an all-oxide ferromagnetic /quasi-two-dimensional electron gas interface
• Designer spin-orbit superlattices: symmetry-protected Dirac cones and spin Berry curvature in two-dimensional van der Waals metamaterials
• Hanle effect in current induced spin orientation
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• Magnetoelectric torque and edge currents in spin-orbit coupled graphene nanoribbons