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Spin-orbit torques (SOT) in thin film heterostructures originate from strongspin-orbit interactions (SOI) that, in the bulk, generate a spin current as theresult of extrinsic spin-dependent, skew or/and side-jump, scattering, or inthe intrinsic case due to Berry curvature in the conduction band. While mostSOT studies have focused on materials with heavy metal components, the oxideperovskite SrRuO3 has been predicted to have a pronounced Berry curvature.Through quantification of its spin current by the SOT exerted on an adjacent Coferromagnetic layer, we determine that SrRuO3 has a strongly temperature (T)dependent spin Hall conductivity which becomes particularly high at low T, e.g.\sigma_{SH} \geqslant (\hbar/2e)3x10^{5} \Omega^{-1}m^{-1} at 60 K. Below theSrRuO3 ferromagnetic transition, non-standard SOT components develop associatedwith the magnetic characteristics of the oxide, but these do not dominate aswith spin currents from a conventional ferromagnet. Our results establish a newapproach for the study of SOI in epitaxial conducting oxide heterostructuresand confirm SrRuO3 as a promising candidate material for achieving new andenhanced spintronics functionalities.

Exceptionally high, strongly temperature dependent, spin Hall conductivity of SrRuO3