SKM 2023 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 22: Terahertz Spintronics

MA 22.1: Vortrag

Dienstag, 28. März 2023, 15:00–15:15, POT 6

Optimizing spin-based terahertz emission from magnetic heterostructures — •Francesco Foggetti, Francesco Cosco, and Peter M. Oppeneer — Uppsala University, Uppsala, Sweden

Terahertz radiation pulses can be generated efficiently through femtosecond laser excitation of a magnetic heterostructure, where an ultrafast laser-induced spin current results in an electromagnetic THz pulse due to the inverse spin Hall effect. It is however still poorly known how the THz emission amplitude and its bandwidth in the frequency regime can be optimized. Here, we perform a systematic analysis of the THz emission from various magnetic heterostructures. The dynamics of the spin current is described by the semiclassical, superdiffusive spin-transport model and, in order to identify the optimal setup for the THz emission, the properties of the wave profile are studied by changing the materials of the heterostructures, their thicknesses, and the laser pulses, allowing us to give optimization guidelines. The energy dependence of spin Hall effect of hot electrons is furthermore taken into account, leading to emission profiles comparable to experiment.