Berlin 2024 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 16: Magnonics I
MA 16.11: Vortrag
Dienstag, 19. März 2024, 12:15–12:30, EB 107
Nonlinear erasing of propagating spin-wave pulses — •David Breitbach1, Moritz Bechberger1, Björn Heinz1, Bert Lägel1, Carsten Dubs2, Roman Verba3, Abbass Hamadeh1, Burkard Hillebrands1, and Philipp Pirro1 — 1Fachbereich Physik and Landesforschungszentrum OPTIMAS, RPTU Kaiserslautern-Landau, Germany — 2INNOVENT e.V. Technologieentwicklung, Jena, Germany — 3Institute of Magnetism, Kyiv 03142, Ukraine
Nonlinear phenomena are key for magnon-based information processing and have led to the realization of numerous building blocks for spin-wave-based computing. The nonlinear interaction between two spin-wave signals requires their spatio-temporal overlap which can be challenging for directional processing devices. We study a nearly compensated, gallium-substituted-YIG film. This system exhibits an exchange-dominated dispersion relation and PMA, resulting in a particularly wide range of group velocities compared to YIG. Using time-resolved BLS microscopy, we demonstrate the excitation of two delayed spin-wave pulses at different frequencies from the same source, where the delayed pulse catches up with the previously excited pulse and outruns it due to its higher group velocity. Depending on the excitation power, the delayed pulse nonlinearly interacts with the first pulse, hindering its propagation and erasing the prior signal. Our work achieves a temporal logic operation with potential application for inhibitory neuromorphic functionality. This research is funded by the DFG - Project No. 271741898, by TRR 173-268565370 (B01), and by the ERC Grant No. 101042439 'CoSpiN'.
Keywords: 1. Nonlinear spin-wave; 2. Spin-wave dynamics; 3. Spin-wave computing; 4. Brillouin Light Scattering (BLS); 5. Yttrium Iron Garnet