TY - UNPB
T1 - Coherent control of terahertz-scale spin resonances using optical spin-orbit torques
AU - Hintermayr, Julian
AU - van Kuppelvelt, Paul M.P.
AU - Koopmans, Bert
PY - 2024/2/28
Y1 - 2024/2/28
N2 - Using optically generated spin-orbit torques generated by the heavy metal Pt we demonstrate coherent control of GHz ferromagnetic resonances in Pt/Co/Pt multilayers as well as sub-THz exchange resonances in [Gd/Co]2 multilayers. Employing a double-pump setup, we show that depending on the helicities of the pump pulses, spin resonances can either be coherently amplified or suppressed if the time delay between the arrival of the pump beams is chosen appropriately. Furthermore, investigating phase and amplitude of the exchange-driven modes, we identify features that challenge the current understanding of optically generated spin-orbit torques, and we discuss possible explanations.
AB - Using optically generated spin-orbit torques generated by the heavy metal Pt we demonstrate coherent control of GHz ferromagnetic resonances in Pt/Co/Pt multilayers as well as sub-THz exchange resonances in [Gd/Co]2 multilayers. Employing a double-pump setup, we show that depending on the helicities of the pump pulses, spin resonances can either be coherently amplified or suppressed if the time delay between the arrival of the pump beams is chosen appropriately. Furthermore, investigating phase and amplitude of the exchange-driven modes, we identify features that challenge the current understanding of optically generated spin-orbit torques, and we discuss possible explanations.
U2 - 10.48550/arXiv.2402.18671
DO - 10.48550/arXiv.2402.18671
M3 - Preprint
VL - 2402.18671
BT - Coherent control of terahertz-scale spin resonances using optical spin-orbit torques
PB - arXiv.org
ER -