Dresden 2026 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 52: Poster Magnetism III

MA 52.20: Poster

Donnerstag, 12. März 2026, 15:00–17:00, P4

Frequency-dependent parametric injection of magnons in yttrium iron garnet — •Lars Schiesser, Franziska Kühn, Matthias R. Schweizer, Vitaliy Vasyuchka, Alexander A. Serga, and Mathias Weiler — Fachbereich Physik and Landesforschungszentrum OPTIMAS, RPTU Kaiserslautern-Landau, 67663 Kaiserslautern, Germany

Parametric generation of magnons in low-damping yttrium iron garnet (YIG) films offers a flexible approach to excite magnons across a broad range of wavenumbers, enabling the creation of high magnon densities, which are essential for the preparation of magnon gases preceding condensation phenomena. Using parallel parametric pumping driven by a broadband stripline antenna, we investigate the frequency dependence of pumping thresholds and the ensuing nonlinear scattering processes. By tuning both the external magnetic field and the pumping frequency, we selectively control the initial position of parametrically injected magnons in momentum space and thus define the starting conditions for subsequent multi-magnon scattering dynamics. Time-resolved Brillouin light scattering (BLS) spectroscopy is employed for the direct observation of the temporal and spectral evolution of the magnon population.

These frequency characteristics provide the basis for the implementation of pumping schemes with arbitrary waveforms, which will enable the realization of complex, tailored excitation signals, opening new pathways for the precise control of nonlinear magnon dynamics.

Keywords: Spin Waves; Bose-Einstein Condensate; Parametric Pumping; Brillouin Light Scattering Spectroscopy