Control of Four-Magnon Scattering by Pure Spin Current in a Magnonic Waveguide
Toni Hache, Lukas Körber, Tobias Hula, K. Lenz, Attila Kákay, Olav Hellwig, Jürgen Lindner, J. Faßbender, Helmut Schultheiß · Physical Review Applied · 2023
Spintronic devices have attracted strong interest in neuromorphic computing, because of their inherent nonlinear behavior and synchronization capabilities. To build magnon-based networks between spintronic oscillators acting as neurons, control mechanisms are the key to adjusting their interactions. This study uses spin-orbit torque to reduce damping and enable magnon scattering in ultrathin waveguides. Microwave power and frequency, as well as spin-current magnitude, can be used as control parameters for nonlinear generation of additional magnon modes at distinct frequencies. Field-dependent time- and space-resolved measurements expose the underlying physical process.