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MA: Fachverband Magnetismus

MA 9: Magnonics I

MA 9.2: Vortrag

Montag, 9. März 2026, 15:15–15:30, HSZ/0004

Magnetically controllable phononic crystals experimentally investigated by combined µSNS-MOKE and µBLS — •Philipp Knaus, Maximilian Alexander Thiel, and Mathias Weiler — Fachbereich Physik and Landesforschungszentrum OPTIMAS, RPTU Kaiserslautern, Germany

Phononic crystals (PnCs) enable tailored elastic wave propagation and bandgap formation in the GHz range [1]. We present a pillar-type PnC made of gold on a LiNbO₃ substrate for controlling Rayleigh surface acoustic waves (SAWs). Using broadband interdigital transducers and nanoscale patterning, we demonstrate a phononic bandgap of 50 MHz at 1.6 GHz. The dispersion relation and spatially resolved SAW fields are measured with a combined micro-focused Super-Nyquist-Sampling Magneto-Optic Kerr Effect (µSNS-MOKE) [2,3] and micro-focused Brillouin Light Scattering (µBLS) setup, providing frequency-, phase-, time-, and space-resolved detection. Measurements reveal clear suppression of SAW propagation within the bandgap and allow direct reconstruction of the dispersion relation. We additionally study the impact of magnetic field on the bandstructrue of PnCs fabricated from CoFe pillars. Paving the way for reconfigurable SAW waveguides, tunable filters, and active phononic devices.

[1] M. Sledzinska et. al, Adv. Funct. Mater. 8, 30 (2020)
[2] G. I. Stegeman, J. Appl. Phys. 49, 5624-5637 (1978)
[3] R. Dreyer, PhD Thesis, Uni Halle (2021)

Keywords: Magnetic-Phononic-Crystal; Surface-Acoustic-Wafes; Magnetoelastic; Magnetooptic; µSNS-MOKE