1. Spatially-extended nonlinear generation of short-wavelength spin waves in YIG nanowaveguides
- Author
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Nikolaev, K. O., Mohapatra, B. Das, Schmidt, G., Demokritov, S. O., and Demidov, V. E.
- Subjects
Condensed Matter - Mesoscale and Nanoscale Physics ,Physics - Applied Physics ,Physics - Optics - Abstract
We experimentally study nonlinear propagation of spin waves in microscopic yttrium iron garnet waveguides, where the dispersion spectrum is engineered to enable efficient four-magnon interactions over a wide range of wavelengths. We show that under these conditions, the initial monochromatic spin wave nonlinearly generates co-propagating spin waves with well-defined, discrete frequencies. This process is characterized by a low energy threshold and can be observed in a wide range of frequencies and excitation powers. Thanks to the engineered dispersion, the process allows the generation of waves with short wavelengths that cannot be excited directly by a linear excitation mechanism. The nonlinearly generated short-wavelength spin waves continuously acquire the energy from the initial pump wave during co-propagation, which results in compensation of their propagation losses over significant distances. The observed phenomena can be used to implement frequency- and wavelength-conversion operations in magnonic nanodevices and circuits.
- Published
- 2024