Pattern recognition with a magnon-scattering reservoir

Abstract

Magnons are elementary excitations in magnetic materials and undergo nonlinear multimode scattering processes at large input powers. In experiments and simulations, we show that the interaction between magnon modes of a confined magnetic vortex can be harnessed for pattern recognition. We study the magnetic response to signals comprising sine wave pulses with frequencies corresponding to radial mode excitations. Three-magnon scattering results in the excitation of different azimuthal modes, whose amplitudes depend strongly on the input sequences. We show that recognition rates above 95\% can be attained for four-symbol sequences using the scattered modes, with strong performance maintained with the presence of amplitude noise in the inputs.

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• Short-wave magnons with multipole spin precession detected in the topological bands of a skyrmion lattice
• Stimulated magnon scattering by non-degenerate parametric excitation
• Resonant inter-mode second harmonic generation by backward spin waves in YIG nano-waveguides
• Highly efficient coherent amplification of zero-field spin waves in YIG nano-waveguides
• Predicting the future with magnons
• Metrics for spin-based computing
• Spin waves involved in three-magnon splitting in synthetic antiferromagnets
• Soft-X-ray momentum microscopy of nonlinear magnon interactions below 100-nm wavelength
• Field Theory of Linear Spin-Waves in Finite Textured Ferromagnets
• Time-resolved observation of magnon splitting into vortex gyration and Floquet spin waves
• Giant mode splitting of azimuthal spin waves in radial vortices
• Nonlinear suppression of dispersion broadening of ultrashort spin-wave pulses in thin YIG films