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1 PublikationControl of Four-Magnon Scattering by Pure Spin Current in a Magnonic Waveguide
Hache, T.; Körber, L.; Hula, T.; Lenz, K.; Kakay, A.; Hellwig, O.; Lindner, J.; Faßbender, J.; Schultheiß, H.
Abstract
We use a pure spin current originating from the spin Hall effect to generate a spin-orbit torque strongly reducing the effective damping in an adjacent ferromagnet. Because of additional microwave excitation, large spin-wave amplitudes are achieved exceeding the threshold for four-magnon scattering, thus resulting in additional spin-wave signals at discrete frequencies. Two or more modes are generated below and above the directly pumped mode with equal frequency spacing. It is shown how this nonlinear process can be controlled in magnonic waveguides by the applied dc current and the microwave pumping power. The sudden onset of the nonlinear effect after exceeding the thresholds can be interpreted as a spiking phenomenon, which makes the effect potentially interesting for neuromorphic computing applications. Moreover, we investigated this effect under microwave frequency and external field variation. The appearance of the additional modes was investigated in the time domain, revealing a time delay between the directly excited and the simultaneously generated nonlinear modes. Furthermore, spatially resolved measurements show different spatial decay lengths of the directly pumped mode and nonlinear modes.
Keywords: spin waves; magnetism; BLS; four-magnon scattering; spin current; spintronics; magnonics
Verknüpfte Publikationen
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Data publication: Control of Four-Magnon Scattering by Pure Spin Current in a …
ROBIS: 37640 HZDR-primary research data are used by this (Id 37519) publication
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Physical Review Applied 20(2023), 014062
DOI: 10.1103/PhysRevApplied.20.014062
arXiv: arXiv:2304.02708
Cited 2 times in Scopus
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Permalink: https://www.hzdr.de/publications/Publ-37519