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MA: Fachverband Magnetismus
MA 52: Poster Magnetism III
MA 52.13: Poster
Donnerstag, 12. März 2026, 15:00–17:00, P4
Broadband Floating-Electrode SAW Transducers for Magnetoelastic Spin-Wave Excitation in CoFeB thin films — •Kawa Noman1, Ryusuke Hisatomi2, Kotaro Taga2, Teruo Ono2, Vitaliy Vasyuchka1, and Mathias Weiler1 — 1Fachbereich Physik and Landesforschungszentrum OPTIMAS, Rheinland-Pfälzische Technische Universität Kaiserslautern-Landau, 67663 Kaiserslautern, Germany — 2Kyoto University, Institute for Chemical Research,Kyoto,Japan
Microwave filters based on surface acoustic wave (SAW) devices exhibit low insertion loss and enable wideband operation in the GHz range. In this study, we microfabricate custom-designed floating-electrode in terdigital transducers (FE-IDTs) on piezoelectric LiNbO3 substrates, whose unique geometry with additional electrically floating metal fin gers enhances electromechanical coupling and broadband SAW exci tation [1]. We then deposit a 10 nm CoFeB thin film by DC mag netron sputtering within the SAW propagation path. We investigate the magnetic-field dependence of the SAW-driven magnetoelastic spin-wave resonance using vector network analysis. Systematic variation of the electrode material, aperture, and duty cycle reveals a rich spec trum of high-amplitude Rayleigh modes at odd and even harmonics of FE-IDT excitation. Moreover, we observe clear signatures of SAW-driven magnetoelastic excitation of spin-waves in CoFeB. High-amplitude SAWs enable non linear magnon generation [2].
[1] K. Yamanouchi et al., IEEE Ultrasonics Symposium (2013)
[2] M. Geilen et al., Applied Physics Letters 120, 242404 (2022)
Keywords: Magnonics; Surface-acoustic waves