Electrically tunable magnon-photon coupling via spin-orbit torque

Hybrid magnon-photon quantum systems are a very useful platform for novel capabilities in quantum information sciences. Here we present a hybrid magnon-photon device with on-chip superconducting microwave resonators and Y₃Fe₅O₁₂ (YIG) thin films that has an electrically tunable magnon-photon coupling. The tunability of the coupling strength is owed to spin-orbit torque originating from the spin Hall effect in a Pt overlayer. This overlayer allows the conversion of an electrical current into a transverse spin current that exerts a torque on the magnetic moments in YIG. We find that the spin-orbit torque can change the coupling strength between the magnon and photon excitations, giving us increased tunability of the device. This work helps pave the way towards more flexible on-chip hybrid magnon devices.