Dresden 2026 – scientific programme

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MA: Fachverband Magnetismus

MA 52: Poster Magnetism III

MA 52.16: Poster

Thursday, March 12, 2026, 15:00–17:00, P4

Impact of Magnetic Ground State on the Generation of an All-Magnonic Frequency Comb — •Alexandra Schrader, Chris Körner, Rouven Dreyer, and Georg Woltersdorf — Martin Luther University Halle-Wittenberg

We have observed the emergence of a magnonic frequency comb in extended Permalloy films as well as in microstructures of Permalloy and CoFeB. Since the frequency comb generation appears to be a unique feature of softmagnetic materials at very low bias fields (below 2 mT), we anticipate a strong correlation between the static ground state and the emerging dynamics. In the case of microstructures, the higher harmonic generation is indeed connected to the non-uniform domain structure at the edges.

However, the presence of these edge effects reduces the frequency multiplication efficiency. In this work, stripes of different aspect ratios are investigated to bridge the gap between extended layers and microstructures. This allows to explore the correlation between the static magnetization pattern obtained in Kerr microscopy and the generation of the frequency comb revealed via SNS-MOKE and NV-center microscopy. Both static and dynamic features are complemented by micromagnetic simulations.

Keywords: MOKE; Frequency comb; Non-linear effects; NV center