We present the experimental demonstration of the parallel parametric generation of spin-waves in a microscaled yttrium iron garnet waveguide with nanoscale thickness. Using Brillouin light scattering microscopy, we observe the excitation of the first and second waveguide modes generated by a stripline microwave pumping source. Micromagnetic simulations reveal the wave vector of the parametrically generated spin-waves. Based on analytical calculations, which are in excellent agreement with our experiments and simulations, we prove that the spin-wave radiation losses are the determinative term of the parametric instability threshold in this miniaturized system. The used method enables the direct excitation and amplification of nanometer spin-waves dominated by exchange interactions. Our results pave the way for integrated magnonics based on insulating nano-magnets.
@article{arxiv.1911.04926,
title = {Parametric generation of propagating spin-waves in ultra thin yttrium iron garnet waveguides},
author = {M. Mohseni and M. Kewenig and R. Verba and Q. Wang and M. Schneider and B. Heinz and F. Kohl and C. Dubs and B. Lägel and A. A. Serga and B. Hillebrands and A. V. Chumak and P. Pirro},
journal= {arXiv preprint arXiv:1911.04926},
year = {2023}
}