Coherent control of terahertz-scale spin resonances using optical spin-orbit torques
arxiv(2024)
摘要
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.
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