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arXiv · 1911.04926

Parametric generation of propagating spin-waves in ultra thin yttrium iron garnet waveguides

M. Mohseni·M. Kewenig·R. Verba·Q. Wang·M. Schneider·B. Heinz·F. Kohl·C. Dubs·B. Lägel·A. A. Serga·B. Hillebrands·A. V. Chumak·P. Pirro
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Abstract

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.

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M. Mohseni, M. Kewenig, R. Verba, Q. Wang, M. Schneider, B. Heinz, F. Kohl, C. Dubs, B. Lägel, A. A. Serga, B. Hillebrands, A. V. Chumak, P. Pirro. 2019-11-12. Parametric generation of propagating spin-waves in ultra thin yttrium iron garnet waveguides. https://doi.org/10.1002/pssr.202000011

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