Effects of spin-orbit torque on the ferromagnetic and exchange spin wave modes in ferrimagnetic CoGd alloy

We use microfocus Brillouin light scattering spectroscopy to study the effects of spin-orbit torque on thermal spin waves in almost angular momentum compensated ferrimagnetic Co-Gd alloy films. The spin-orbit torque is produced by the electric current flowing in the Pt layer adjacent to the Co-Gd film. Both the ferromagnetic and the exchange modes are detected in our measurements. The intensity and the linewidth of the ferromagnetic mode are modified by the spin-orbit torque. In contrast, the properties of the exchange mode are unaffected by the spin-orbit torque. We also find that the frequencies and the linewidths of both modes are significantly modified by Joule heating, owing to the strong temperature dependence of the magnetic properties of Co-Gd in the vicinity of the angular momentum compensation point. Our results provide insight into the mechanisms that can enable the implementation of subterahertz magnetic nano-oscillators based on ferrimagnetic materials, as well as related effects in antiferromagnets.