  Spin-charge interconversion in systems with spin-orbit coupling has provided
a new route for the generation and detection of spin currents in functional
devices for memory and logic such as spin-orbit torque switching in magnetic
memories or magnetic state reading in spin-based logic. Disentangling the bulk
(spin Hall effect) from the interfacial (inverse spin galvanic effect)
contribution has been a common issue to properly quantify the spin-charge
interconversion in these systems, being the case of Au paradigmatic. Here, we
obtain a large spin-charge interconversion at a highly conducting Au/Cu
interface which is experimentally shown to arise from the inverse spin galvanic
effect of the interface and not from the spin Hall effect of bulk Au. We use
two parameters independent of the microscopic details to properly quantify the
spin-charge interconversion and the spin losses due to the interfacial
spin-orbit coupling, providing an adequate benchmarking to compare with any
spin-charge interconversion system. The good performance of this metallic
interface, not based in Bi, opens the path to the use of much simpler
light/heavy metal systems.
