Spin-wave frequency combs
Tobias Hula, Katrin Schultheiß, F. J. T. Gonçalves, Lukas Körber, Mauricio Bejarano, M. Copus, Luis Flacke, Lukas Liensberger, Aleksandr Buzdakov, Attila Kákay, Mathias Weiler, R. E. Camley, J. Faßbender, Helmut Schultheiß
Abstract
We experimentally demonstrate the generation of spin-wave frequency combs based on the nonlinear interaction of propagating spin waves in a microstructured waveguide. By means of time- and space-resolved Brillouin light scattering spectroscopy, we show that the simultaneous excitation of spin waves with different frequencies leads to a cascade of four-magnon scattering events, which ultimately results in well-defined frequency combs. Their spectral weight can be tuned by the choice of amplitude and frequency of the input signals. Furthermore, we introduce a model for stimulated four-magnon scattering, which describes the formation of spin-wave frequency combs in the frequency and time domain.