Highly efficient and tuneable spin-to-charge conversion through Rashba coupling at oxide interfaces

Abstract

The spin-orbit interaction couples the electrons' motion to their spin. Accordingly, passing a current in a material with strong spin-orbit coupling generates a transverse spin current (spin Hall effect, SHE) and vice-versa (inverse spin Hall effect, ISHE). The emergence of SHE and ISHE as charge-to-spin interconversion mechanisms offers a variety of novel spintronics functionalities and devices, some of which do not require any ferromagnetic material. However, the interconversion efficiency of SHE and ISHE (spin Hall angle) is a bulk property that rarely exceeds ten percent, and does not take advantage of interfacial and low-dimensional effects otherwise ubiquitous in spintronics hetero- and mesostructures. Here, we make use of an interface-driven spin-orbit coupling mechanism - the Rashba effect - in the oxide two-dimensional electron system (2DES) LaAlO3/SrTiO3 to achieve spin-to-charge conversion with unprecedented efficiency. Through spin-pumping, we inject a spin current from a NiFe film into the oxide 2DES and detect the resulting charge current, which can be strongly modulated by a gate voltage. We discuss the amplitude of the effect and its gate dependence on the basis of the electronic structure of the 2DES.

Final version just published in Nature Materials. Contact author for a reprint

References in corpus (4)

• Oxide spintronics
• Theory of spin-orbit coupling at LaAlO3/SrTiO3 interfaces and SrTiO3 surfaces
• Intrinsic instability of electronic interfaces with strong Rashba coupling
• Field-effect control of superconductivity and Rashba spin-orbit coupling in top-gated LaAlO3/SrTiO3 devices

Cited by in corpus (34)

• Emergent Phenomena Induced by Spin-Orbit Coupling at Surfaces and Interfaces
• Hybrid magnonics: physics, circuits and applications for coherent information processing
• Observation of Inverse Edelstein Effect in Rashba-Split 2DEG between SrTiO3 and LaAlO3 at Room Temperature
• Maximal Rashba-like spin splitting via kinetic energy-driven inversion symmetry breaking
• Optimal charge-to-spin conversion in graphene on transition metal dichalcogenides
• Nonlinear spin current generation in noncentrosymmetric spin-orbit coupled systems
• Charge transfer driven emergent phenomena in oxide heterostructures
• Efficient Charge-Spin Conversion and Magnetization Switching though Rashba Effect at Topological Insulator/Ag Interface
• Spintronics, from giant magnetoresistance to magnetic skyrmions and topological insulators
• Band Structure and Spin-Orbital Texture of the (111)-KTaO3 Two-Dimensional Electron Gas
• Gate tunability of highly efficient spin-to-charge conversion by spin Hall effect in graphene proximitized with WSe${}_2$
• Spin transport and dynamics in all-oxide perovskite La${}_{2/3}$Sr${}_{1/3}$MnO${}_3$/SrRuO${}_3$ bilayers probed by ferromagnetic resonance
• Electrically Controlled Spin Injection from Giant Rashba Spin-Orbit Conductor BiTeBr
• Theory of the spin galvanic effect at oxide interfaces
• Quantitative investigation of the inverse Rashba-Edelstein effect in Bi/Ag and Ag/Bi on YIG
• Evaluation of bulk-interface contributions to Edelstein magnetoresistance at metal/oxide interfaces
• Tuning up or down the critical thickness in LaAlO3/SrTiO3 through in situ deposition of metal overlayers
• Spin Hall Effect in Bilayer Graphene Combined with an Insulator up to Room Temperature
• Self-formed $LaAl{O}_3/SrTi{O}_3$ Micro-Membranes
• Two-dimensional electron system at the magnetically tunable EuO/SrTiO${}_3$ interface
• Strain-induced large spin splitting and persistent spin helix at LaAlO${}_3$/SrTiO${}_3$ interface
• A switchable two-dimensional electron gas based on ferroelectric Ca:SrTiO${}_3$
• High sensitivity variable-temperature infrared nanoscopy of conducting oxide interfaces
• Spin galvanic effect at the conducting SrTiO3 surfaces
• Redox-controlled epitaxy and magnetism of oxide heterointerfaces: EuO/SrTiO${}_3$
• First-principles and model simulation of all-optical spin reversal
• Supercurrent generation by spin injection in an s-wave superconductor-Rashba metal bilayer
• Evidence of Pure Spin-Current Generated by Spin Pumping in Interface Localized States in Hybrid Metal-Silicon-Metal Vertical Structures
• Tunable spin and orbital polarization in SrTiO3-based heterostructures
• Spin-Hall effect and emergent antiferromagnetic phase transition in n-Si
• Anisotropic Spin Relaxation Induced by Surface Spin-Orbit Effects
• Anisotropic Magnetoresistance in Multiband Systems: 2DEGs and Polar Metals at Oxide Interfaces
• Quantized conductance in a one-dimensional ballistic oxide nanodevice
• Quantification of interfacial spin-charge conversion in metal/insulator hybrid structures by generalized boundary conditions