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MA: Fachverband Magnetismus
MA 9: Magnonics I
MA 9.4: Vortrag
Montag, 9. März 2026, 15:45–16:00, HSZ/0004
Phase-resolved imaging of coherent phonon-magnon coupling — •Yannik Kunz1, Florian Kraft1, Kevin Künstle1, Matthias Küß2, Stephan Glamsch2, Manfred Albrecht2, and Mathias Weiler1 — 1Fachbereich Physik and Landesforschungszentrum OPTIMAS, RPTU in Kaiserslautern, Germany — 2Institute of Physics, University of Augsburg, Augsburg, Germany
The interaction between surface acoustic waves (SAWs) and spin waves (SWs) has become a major focus in magnetoacoustic research, as numerous studies have demonstrated the efficiency of SAW-driven SW excitation [1,2]. However, the coherence of the underlying magnetoelastic driving mechanism has so far only been inferred indirectly from microfocused Brillouin light scattering measurements [3].
We employ spatially resolved polarization-modulating optical detection [4] to directly visualize the resonant SAW-to-SW conversion with phase sensitivity. Hereby, LiTaO3 provides a platform to excite shear-horizontal SAW modes in a magnetostrictive Co40Fe40B20(5 nm) layer. Our technique enables direct imaging of the coherent driving of spin waves by surface acoustic waves, providing advanced insights into the dynamics of phonon-magnon coupling.
[1] Küß et al., Frontiers in Physics 10, 981257 (2022)
[2] Kunz et al., Phys. Rev. Appl. 24, 014043 (2025)
[3] Kunz et al., Appl. Phys. Lett. 124, 152403 (2024)
[4] Liensberger et al. IEEE Magn. Lett. 10, 5503905 (2019)
Keywords: Magnonics; Phonon-Magnon-interactions; Magnetoelastic; Magnetooptic