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MA: Fachverband Magnetismus

MA 31: Poster II

MA 31.29: Poster

Mittwoch, 19. März 2025, 17:00–19:30, P1

Towards magnetically controlled phononic crystals — •Philipp Knaus, Maximilian Alexander Thiel, Kaya Gauch, and Mathias Weiler — Fachbereich Physik and Landesforschungszentrum Optimas, RPTU Kaiserslautern, Germany

Phononic crystals (PnCs) are materials with periodic modulations in their elastic properties that allow precise tuning of the phonon dispersion relation, enabling control of phonon propagation, including bandgaps, waveguiding and confinement. Recent advances have focused on 2D PnCs, which support innovative applications such as nanoscale information processing, optomechanical systems and thermal management [1]. This work represents a first step towards magnetically controlled PnCs based on surface acoustic waves, where the phononic properties of the material can be tuned. We study a magnetically controlled PnC based on Lithium Niobate LiNbO₃/CoFeB heterostructure. We characterize our prototype by electrical transmission measurements using a vector network analizer and optical measurements based on Brillouin Light Scattering and the time-resolved magneto-optic Kerr effect. Based on our results, we discuss potential applications and device optimization.
[1] M. Sledzinska et. al, Adv. Funct. Mater. 8, 30 (2020)

Keywords: Phononic crystals; Topological acoustics; Phonon-Magnon-Interactions; Magnetoelastic; Magnonics