SKM 2021 – scientific programme

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MA: Fachverband Magnetismus

MA 11: Posters Magnetism III

MA 11.7: Poster

Wednesday, September 29, 2021, 13:30–16:30, P

Influence of Spatial Confinement on Spin-Wave Frequency Combs — •Christopher Heins¹, Tobias Hula^1,2, Katrin Schultheiss¹, Francisco Goncalves¹, Lukas Körber^1,3, Mauricio Bejarano^1,3, Luis Flacke^4,5, Lukas Liensberger^4,5, Aleksandr Buzdakov¹, Attila Kákay¹, Mathias Weiler^4,5,6, Jürgen Fassbender^1,3, and Helmut Schultheiss¹ — ¹Helmholtz-Zentrum Dresden-Rossendorf, Germany — ²TU Chemnitz, Germany — ³TU Dresden, Germany — ⁴Walther-Meißner-Institut, Garching, Germany — ⁵TU München, Germany — ⁶TU Kaiserslautern, Germany

Recently, it has been shown that four-magnon scattering in a stripe-shaped magnonic waveguide can be stimulated and utilized to generate spin wave frequency combs [1].

Here, we demonstrate that by restricting possible eigenstates via a two-dimensional spatial confinement the stimulated four-magnon scattering can be enhanced and a single RF excitation leads to the spontaneous formation of a frequency comb. We determine the frequency spacing of the spin wave modes in a Co25Fe75 rectangular microconduit with micromagnetic simulations and explore the formation of spin-wave frequency combs experimentally by means of micro-focused Brillouin light scattering. Further, we show that the spontaneously generated frequency comb can be resonantly amplified by a second RF excitation.

The authors acknowledge financial support from the Deutsche Forschungsgemeinschaft within program SCHU 2922/1-1.

[1] Hula et al., arXiv:2104.11491 (2021)