Spin-orbit torques and charge pumping in YIG/Pt bilayers

Efficient control of magnetic elements using charge currents is essential for spintronics applications. The magnetization of a ferromagnetic insulator (FI) thin-film can be controlled by a current through an adjacent normal metal (N) thin film. We theoretically investigate the spin-orbit torques in Pt/YIG bilayers taking the crystal symmetries of the materials into account. Besides the damping torque in bilayers with C$_{\infty v}$ symmetry, the crystal symmetry of the clean Pt/YIG bi-layers also allows additional spin-orbit torque contributions. We show that the spin-orbit torque terms can be differentiated via charge pumping, in which the precession of a ferromagnet generates a charge current. The additional spin-orbit torque terms refine the understanding of the control of the magnetic moments