We experimentally and theoretically demonstrate that nonlinear spin-wave dynamics can induce an effective resonant interaction between non-resonant magnon modes in a yttrium iron garnet disk. Under strong pumping near the ferromagnetic resonance mode, we observe a spectral splitting that emerges with increasing drive amplitude. This phenomenon is well captured by a theoretical framework based on the linearization of a magnon three-wave mixing Hamiltonian, which at high power leads to parametric Suhl instabilities. The access and control of nonlinear magnon-parametric processes enables the development of experimental platforms in an unexplored parameter regime for both classical and quantum computation protocols.
@article{arxiv.2506.11527,
title = {Magnon-magnon interaction induced by nonlinear spin wave dynamics},
author = {Matteo Arfini and Alvaro Bermejillo-Seco and Artem Bondarenko and Clinton A. Potts and Yaroslav M. Blanter and Herre S. J. van der Zant and Gary A. Steele},
journal= {arXiv preprint arXiv:2506.11527},
year = {2025}
}