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MA: Fachverband Magnetismus
MA 31: Poster II
MA 31.34: Poster
Mittwoch, 19. März 2025, 17:00–19:30, P1
Excitation of spin waves via surface acoustic waves in complex magnetic domain structures — •Mohammad Javad Kamali Ashtiani1, Alexandre Abbass Hamadeh2, Ephraim Spindler1, Mathias Weiler1, and Philipp Pirro1 — 1Fachbereich Physik and Landesforschungszentrum OPTIMAS, RPTU Kaiserslautern-Landau, 67663 Kaiserslautern, Germany — 2Center de Nanosciences et de Nanotechnologies, CNRS, Universite Paris-Saclay, 91120, Palaiseau, France
We investigated the interaction of surface acoustic waves (SAWs) with spin waves (SWs) in micrometer-sized cobalt-iron-boron (CoFeB) dots on a piezoelectric --ScAlN-- substrate. These dots exhibit particular domain structures leading to complex magnon-phonon coupling. SAWs, generated using interdigital transducers across a broad GHz frequency range, were observed to excite SWs in the CoFeB structures. The dynamics were characterized using micro-focused Brillouin light scattering (*BLS) spectroscopy, allowing direct detection of SAW and SW excitations. Nitrogen-vacancy magnetometry provided high-resolution insights into the magnetic domain arrangement. Also, Mumax3 simulations confirmed the complex domain textures. The response of SWs at specific resonance magnetic fields was observed and shifted across different frequencies. Our findings highlight the potential of hybrid phonon-magnon systems for tunable magnonic devices, advancing wave-based information processing technologies. This research was supported by DFG under TRR 173/3 - 268565370 Spin+X (Project B01).
Keywords: Spin wave; Surface ascoutic wave; Magnon-phonon interaction; Brillouin Light Scattering Spectroscopy