Berlin 2024 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 20: Poster I

MA 20.12: Poster

Dienstag, 19. März 2024, 16:30–19:00, Poster A

All-magnonic non-linear frequency conversion processes — •Paul Rondt, Rouven Dreyer, Chirs Körner, and Georg Woltersdorf — Martin Luther University Halle-Wittenberg, Institute of Physics, Von-Danckelmann-Platz 3, 06120 Halle (Saale), Germany

In magnonics, the phase state of spin-wave excitations in magnetically ordered materials can be exploited as a carrier of information for spin-based devices. Over the last decade, non-linear processes, such as three and four-magnon scattering, have pushed magnonics to the next level by demonstrating magnonic counterparts of electronic devices. However, the possibility of frequency up-conversion as a basic functionality for all-magnonic circuits was missing. To understand the potential use of higher-order non-linear processes, we investigated microstructured Ni₈₀Fe₂₀ elements by using the phase-sensitive SNS-MOKE approach as a function of element size and shape [1]. By employing this technique, we demonstrated the existence of phase-stable non-linear spin waves oscillating at odd half-integer multiples of the driving frequency and applied a phase-locking scheme [2]. Moreover, we found that for low-frequency excitations an all-magnonic frequency comb emerges spanning over six octaves, allowing to link MHz frequencies from CMOS devices to high-frequency spin-wave excitations in magnonic circuits [3].

References [1] R. Dreyer, et al., Phys. Rev. Mat. 5, 064411 (2021). [2] R. Dreyer, et al., Nat. Commun. 13, 4939 (2022). [3] C. Koerner, et al., Science 375, 1165-1169 (2022)

Keywords: Magnonics; SNS-MOKE; NV-Center; non-linear Spin waves; Frequency Comb