Anisotropic spin-orbit torque generation in epitaxial SrIrO3 by symmetry design

Abstract

Spin-orbit coupling (SOC), the interaction between the electron spin and the orbital angular momentum, can unlock rich phenomena at interfaces, in particular interconverting spin and charge currents. Conventional heavy metals have been extensively explored due to their strong SOC of conduction electrons. However, spin-orbit effects in classes of materials such as epitaxial 5d-electron transition metal complex oxides, which also host strong SOC, remain largely unreported. In addition to strong SOC, these complex oxides can also provide the additional tuning knob of epitaxy to control the electronic structure and the engineering of spin-to-charge conversion by crystalline symmetry. Here, we demonstrate room-temperature generation of spin-orbit torque on a ferromagnet with extremely high efficiency via the spin-Hall effect in epitaxial metastable perovskite SrIrO3. We first predict a large intrinsic spin-Hall conductivity in orthorhombic bulk SrIrO3 arising from the Berry curvature in the electronic band structure. By manipulating the intricate interplay between SOC and crystalline symmetry, we control the spin-Hall torque ratio by engineering the tilt of the corner-sharing oxygen octahedra in perovskite SrIrO3 through epitaxial strain. This allows the presence of an anisotropic spin-Hall effect due to a characteristic structural anisotropy in SrIrO3 with orthorhombic symmetry. Our experimental findings demonstrate the heteroepitaxial symmetry design approach to engineer spin-orbit effects. We therefore anticipate that these epitaxial 5d transition-metal oxide thin films can be an ideal building block for low-power spintronics.

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Cited by in corpus (35)

• Roadmap of spin-orbit torques
• Oxide spin-orbitronics: spin-charge interconversion and topological spin textures
• Maximizing Spin-Orbit Torque Generated by the Spin Hall Effect of Pt
• Perspectives of Electrically generated spin currents in ferromagnetic materials
• Role of Dirac nodal lines and strain on the high spin Hall conductivity of epitaxial IrO2 thin films
• Boosting spintronics with superconductivity
• Rational design principles for giant spin Hall effect in 5d-transition metal oxides
• Spin-orbit torque generation in NiFe/IrO2 bilayers
• Magnetism at iridate/manganite interface: influence of strong spin-orbit interaction
• Observation of Nonlinear Spin-Charge Conversion in the Thin Film of Nominally Centrosymmetric Dirac Semimetal SrIrO3 at Room Temperature
• Strong Spin-Orbit Torque Induced by the Intrinsic Spin Hall Effect in Cr1-xPtx
• Absence of significant spin current generation in Ti/FeCoB bilayers with strong interfacial spin-orbit coupling
• Efficient Spin-Orbit Torque Generation in Semiconducting WTe2 with Hopping Transport
• Gigantic Anisotropy of Self-Induced Spin-Orbit Torque in Weyl Ferromagnet Co2MnGa
• Boosting spin-orbit torque efficiency in spin-current generator/magnet/oxide superlattices
• Emergence of insulating ferrimagnetism and perpendicular magnetic anisotropy in 3d-5d perovskite oxide composite films for insulator spintronic
• Anisotropic linear and nonlinear charge-spin conversion in topological semimetal SrIrO3
• Substrate-induced spin-torque-like signal in spin-torque ferromagnetic resonance measurement
• Unified Framework for Charge-Spin Interconversion in Spin-Orbit Materials
• Isostructural Metal-Insulator Transition Driven by Dimensional-Crossover in SrIrO3 Heterostructures
• Room temperature spin-orbit torque efficiency and magnetization switching in SrRuO3-based heterostructures
• Spin mixing conductance and spin magnetoresistance of iridate/manganite interface
• Spin-orbit torque generation in bilayers composed of CoFeB and epitaxial SrIrO${}_3$ grown on an orthorhombic DyScO${}_3$ substrate
• Angular dependence of Hall effect and magnetoresistance in SrRuO${}_3$-SrIrO${}_3$ heterostructures
• Stacking-order effect on spin-orbit torque, spin-Hall magnetoresistance, and magnetic anisotropy in Ni${}_{81}$Fe${}_{19}$-IrO${}_2$ bilayers
• Spin current generation from an epitaxial tungsten dioxide WO${}_2$
• Large asymmetric anomalous Nernst effect in the antiferromagnet SrIr${}_{0.8}$Sn${}_{0.2}$O${}_3$
• Giant non-volatile electric field control of proximity induced magnetism in the spin-orbit semimetal SrIrO3
• Large Spin-to-Charge Conversion in Ultrathin Gold-Silicon Multilayers
• Effect of crystallinity on spin-orbit torque in 5$\text{d}$ iridium oxide IrO${}_2$
• Observation of charge-to-spin conversion with giant efficiency at Ni${}_{0.8}$Fe${}_{0.2}$/Bi${}_2$WO${}_6$ interface
• Interface controlled Berry phase and anisotropic spin-charge conversion in altermagnet-topological insulator bilayers
• Growth-sequence-dependent interface magnetism of SrIrO${}_3$ - La${}_{0.7}$Sr${}_{0.3}$MnO${}_3$ bilayers
• Coexistence of insulator-like paramagnon and metallic spin-orbit exciton modes in SrIrO${}_3$
• Effect of interface quality on spin Hall magnetoresistance in Pt/MgFe${}_2$O${}_4$ bilayers