Nonlinear losses in magnon transport due to four-magnon scattering
Tobias Hula, Katrin Schultheiß, Aleksandr Buzdakov, Lukas Körber, Mauricio Bejarano, Luis Flacke, Lukas Liensberger, Mathias Weiler, Justin M. Shaw, Hans T. Nembach, J. Faßbender, Helmut Schultheiß
Abstract
waveguides with low magnetic damping. We determine the magnon propagation length with microfocused Brillouin light scattering over a broad range of excitation powers and detect a decrease of the attenuation length at high powers. This is consistent with the onset of nonlinear four-magnon scattering. Hence, it is critical to stay in the linear regime, when deriving damping parameters from the magnon propagation length. Otherwise, the intrinsic nonlinearity of magnetization dynamics may lead to a misinterpretation of magnon propagation lengths and, thus, to incorrect values of the magnetic damping of the system.