SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 16: Magnonics
MA 16.5: Vortrag
Dienstag, 28. März 2023, 10:45–11:00, HSZ 403
Time-correlated nonlinear spiking spin waves in Ga:YIG — •David Breitbach1, Moritz Bechberger1, Björn Heinz1, Jan Maskill1, Bert Lägel1, Carsten Dubs2, Burkard Hillebrands1, and Philipp Pirro1 — 1Fachbereich Physik and Landesforschungszentrum OPTIMAS, RPTU Kaiserslautern-Landau, Germany — 2INNOVENT e.V. Technologieentwicklung, Jena, Germany
Nonlinear spin-wave phenomena are key for magnon-based information processing and have led to the realization of numerous building blocks for spin-wave based computing. For coherent spin waves, the nonlinear frequency shift is one of the most robust nonlinear effects. In this study, we utilize this effect to build a spin-wave reservoir with temporal signal correlation. We apply time-resolved BLS microscopy to investigate the coherent excitation of spin waves by a microantenna in an in-plane magnetized, gallium-substituted yttrium iron garnet film. This system exhibits an exchange-dominated dispersion relation and PMA, resulting in a positive nonlinear frequency shift. We observe a strongly power-dependent nonlinear excitation and show that the nonlinear frequency shift creates an effective interaction between successive spin-wave excitations. This effectively serves as a fading memory in the system which can be used to temporally correlate input signals. Our work provides a foundation for future implementations of reservoir and neuromorphic computing in magnonic systems. This research is funded by the DFG - Project No. 271741898 and TRR 173-268565370 (B01) and by the ERC Grant No. 101042439 'CoSpiN'.