SKM 2021 – scientific programme

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MA: Fachverband Magnetismus

MA 8: INNOMAG e.V. Dissertationspreis / Ph.D. Thesis Prize (2020)

MA 8.4: Talk

Wednesday, September 29, 2021, 11:15–11:40, H2

Linear and nonlinear spin waves in nanoscale magnonic structures for data processing — •Qi Wang — Fachbereich Physik and Landesforschungszentrum OPTIMAS, Technische Universität Kaiserslautern, D-67663 Kaiserslautern, Germany

Spin waves, and their quanta magnons, attract attention as novel data carriers instead of electrons in future low-energy data processing units due to their short wavelength, low losses, and abundant nonlinear phenomena. Although separated spin-wave logic gates have already been demonstrated, the smallest sizes of these elements are in the ranges of a few micrometers and are not competitive with the current state-of-the-art CMOS technology. Moreover, the realization of an integrated magnonic circuit is still an unresolved challenge.

The objective of this talk is to present a nanoscale magnon directional coupler as a universal data processing unit for performing different logic operations and suitable for the integration into a magnonic circuit. First, the spin-wave characteristics in the nanoscale waveguides were studied theoretically and experimentally. Based on this knowledge, a nanoscale directional coupler was designed and its linear and nonlinear functionalities were studied using Brillouin Light Scattering spectroscopy. Following, the first integrated magnonic circuit consisting of two couplers and performing half-adder functionality was studied numerically. Finally, we introduced the inverse-design method into the field of magnonics and demonstrated its high performance, flexibility, and potential. These studies were supported by ERC StG MagnonCircuits.