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MA: Fachverband Magnetismus
MA 9: Magnonics I
MA 9.3: Vortrag
Montag, 9. März 2026, 15:30–15:45, HSZ/0004
Coherent Magnetoelastic Phonon Generation in CMOS-Compatible Ni/Si Microstructures — •Mohammad Javad Kamali Ashtiani1, Johan Sebastian Ramirez Amado2, Abbas Koujok1, Hanadi Mortada1,2, Björn Heinz1, Asma Mouhoub2, Thibaut Devolder2, Philipp Pirro1, and Alexandre Abbass Hamadeh2 — 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 investigate coherent phonon generation in a CMOS-compatible device using Ni micro-striplines fabricated on Si. Due to the coherent precession of the magnetization in Ni and its significant magnetostriction, the free energy oscillates at the drive frequency. Under appropriate conditions, this leads to oscillation of elastic forces on the Si substrate, which launches a propagating surface acoustic wave (SAW). By sweeping the excitation frequency and external magnetic field, we identify resonant conditions for magnon excitation in Ni stripes, which leads to coherent phonon generation.
Under this resonant excitation (e.g., 2.35 GHz, 10 mT), we observe strong phonon emission by micro-focused Brillouin light scattering. These results demonstrate that Ni/Si microstructures provide an efficient platform for studying field-tunable magnon-phonon interactions and magnetoelastic phonon generation in non-piezoelectric media. This research was supported by ANR-25-CE24-6700-01 (SAWSiX) and the DFG through TRR-173/3-268565370 Spin+X (Project-B01).
Keywords: Magnetoelastic; Brillouin light scattering; Surface acoustic waves; Phonon generation; Silicon