Speaker
Description
In the last decade the physics of spin waves has regained interest in the emerging field of magnonics. In a magnonic device, the collective precession motion of spins in a ferromagnet permits to process information at low power consumption and high operation speed in a wide frequency range from GHz to THz. Spin waves present two important features: their frequency can be easily varied by applying an external magnetic field, Bext, and their dispersion curves strongly depend on the direction of Bext with respect to the SW wave vector. Moreover, fascinating phenomena involving spin waves and phonons are observed at the magnetoelastic resonance as acoustically-assisted spin pumping [1,2] up to the acoustically driven magnetization switching [3, 4]. In this context, Surface Acoustic waves (SAW), a mature technology, triggers efficiently magnetization dynamics: resonant effects are obtained with appropriate intensities and directions of the external magnetic field (Bext). This tunability is an asset for magnonic applications of SAW-FMR (ferromagnetic resonance). I will present our results obtained in Fe epitaxially grown on GaAs(001), a spintronic and magnonic compatible magnetoelastic and piezoelectric hetero-structure.[5,6,7]
[1] M. Weiler, et al. PRL, 108, 176601 (2012)
[2] Uchida, et al., Solid State Comm. 198, 26 (2014)
[3] L. Thevenard,et al. PRB, 2016, 93, 134430 (2016)
[4] P. Kuszewski, et al. JOP: Cond. Mat., 30, 244003 (2018)
[5] J.-Y. Duquesne, et al. PR Applied, 12, 024042 (2019)
[6] P. Rovillain et al. PR Applied 18, 064043 (2022)
[7] A. Sharma et al. Appl. Phys. Letter, 128, 062404 (2026)
