True amplification of spin waves in magnonic nano-waveguides

Abstract

Magnonic nano-devices exploit magnons -- quanta of spin waves -- to transmit and process information within a single integrated platform that has the potential to outperform traditional semiconductor-based electronics for low power applications. The main missing cornerstone of this information nanotechnology is an efficient scheme for the direct amplification of propagating spin waves. The recent discovery of spin-orbit torque provided an elegant mechanism for propagation losses compensation. While partial compensation of the spin-wave damping has allowed for spin-wave signal modulation, true amplification - the exponential increase in the spin-wave intensity during propagation - has so far remained elusive. Here we evidence the operating conditions to achieve unambiguous amplification using clocked nanoseconds-long spin-orbit torque pulses in sub-micrometer wide magnonic waveguides, where the effective magnetization has been engineered to be close to zero to suppress the detrimental magnon-magnon scattering. As a result, we achieve an exponential increase in the intensity of propagating spin waves up to 500 % at a propagation distance of several micrometers. These results pave the way towards the implementation of energy efficient, cascadable magnonic architectures for wave-based information processing and complex on-chip computation.

arXiv commentThis preprint has not undergone peer review or any post-submission improvements or corrections. The Version of Record of this article is published in Nature Communications, and is available online at https://doi.org/10.1038/s41467-024-45783-1

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Cited by in corpus (8)

• Current-Controlled Magnon-Magnon Coupling in an On-Chip Cavity Resonator
• Ultrathin bismuth-yttrium iron garnet films with tunable magnetic anisotropy
• Resonant inter-mode second harmonic generation by backward spin waves in YIG nano-waveguides
• Metrics for spin-based computing
• Highly efficient coherent amplification of zero-field spin waves in YIG nano-waveguides
• Nonlinear spin-Wave Doppler effect for flexible tuning of magnonic frequencies
• Nonlinear suppression of dispersion broadening of ultrashort spin-wave pulses in thin YIG films
• Spin-wave Goos-Hänchen effect induced by 360 degree domain walls in magnetic heterostructures