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Spin-orbit coupling (SOC), the interaction between the electron spin and theorbital angular momentum, can unlock rich phenomena at interfaces, inparticular interconverting spin and charge currents. Conventional heavy metalshave been extensively explored due to their strong SOC of conduction electrons.However, spin-orbit effects in classes of materials such as epitaxial5d-electron transition metal complex oxides, which also host strong SOC, remainlargely unreported. In addition to strong SOC, these complex oxides can alsoprovide the additional tuning knob of epitaxy to control the electronicstructure and the engineering of spin-to-charge conversion by crystallinesymmetry. Here, we demonstrate room-temperature generation of spin-orbit torqueon a ferromagnet with extremely high efficiency via the spin-Hall effect inepitaxial metastable perovskite SrIrO3. We first predict a large intrinsicspin-Hall conductivity in orthorhombic bulk SrIrO3 arising from the Berrycurvature in the electronic band structure. By manipulating the intricateinterplay between SOC and crystalline symmetry, we control the spin-Hall torqueratio by engineering the tilt of the corner-sharing oxygen octahedra inperovskite SrIrO3 through epitaxial strain. This allows the presence of ananisotropic spin-Hall effect due to a characteristic structural anisotropy inSrIrO3 with orthorhombic symmetry. Our experimental findings demonstrate theheteroepitaxial symmetry design approach to engineer spin-orbit effects. Wetherefore anticipate that these epitaxial 5d transition-metal oxide thin filmscan be an ideal building block for low-power spintronics.

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