Regensburg 2025 – scientific programme

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MA: Fachverband Magnetismus

MA 31: Poster II

MA 31.37: Poster

Wednesday, March 19, 2025, 17:00–19:30, P1

Efficient all-magnonic frequency multiplication in nano-scale devices — •Chris Körner¹, Anna Kiefel¹, Rouven Dreyer¹, Alexandra Schrader¹, Niklas Liebing², and Georg Woltersdorf¹ — ¹Martin-Luther-Universität Halle-Wittenberg, Institut für Physik, Von Danckelmann Platz 3, 06120 Halle (Saale) — ²Fraunhofer-Institut für Elektronische Nanosysteme ENAS, Technologie-Campus, 3 09126 Chemnitz

We recently have observed all-magnonic frequency multiplication and the generation of a 6-octave spanning frequency comb within an extended polycrystalline NiFe layer [1]. At low bias fields the magnetization locally tilts due to a magnetic ripple effect in the film. Driving the magnetization with frequencies far below ferromagnetic resonance, i.e. in the MHz range, causes rapid synchronous switching and leads to high harmonic spin wave emission. To make use of this effect in an actual device it is necessary to shrink the dimensions of the active components and to enhance the efficiency of the frequency multiplication process. The aim is to generate spin waves in the range of up to 10 GHz most efficiently in elements as small as possible, just from r.f. excitation with MHz frequencies. We employ micromagnetic simulations to investigate how the generation efficiency is influenced by external parameters, such as bias field and the shape, size, and thickness of micrometer sized NiFe elements. We find that the comb generation process can still be efficient even if we scale down the elements to just a few microns and compare these results to NV-center and SNS-MOKE measurements. [1] Koerner et al. Science, 375 (6585) 2022.

Keywords: Frequency Multiplication; NV center