Spin-wave dynamics driven by spin-orbit torque

Magnonics is an emerging subfield of modern magnetism that investigates spin waves (magnons) in terms of their potential applications as nanoscale signal carriers. Magnonics has made significant progress over the past decade. Nevertheless, there are still several ma- jor obstacles hindering the implementation of technologically competitive magnonic devices. First, the existing spin wave excitation methods are characterized by low energy efficiency at the nanoscale. Second, spin waves propagating in thin magnetic films experience large propagation losses. The advent of spin-orbit torque (SOT) phenomena has opened new horizons for magnonics, since SOT provides the means to overcome the described obstacles. However, recent intense studies of SOT have revealed new unexpected difficulties and challenges associated with the emergence of complex nonlinear processes in nonequilibrium magnetic systems. This thesis is devoted to finding routes to resolve these issues limiting the progress in the field of SOT-driven magnonics. The obtained results are expected to accelerate new developments in this field and enable the implementation of spin-wave-based devices that will be more attractive for real-world applications.