Berlin 2024 – scientific programme

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MA: Fachverband Magnetismus

MA 36: Terahertz Spintronics II

MA 36.3: Talk

Thursday, March 21, 2024, 10:00–10:15, EB 202

Modeling superdiffusive spin current-induced terahertz emission from layered heterostructures — •Francesco Foggeti and Peter M. Oppeneer — Uppsala University, Uppsala, Sweden

In ultrafast spintronic teraherts emitters, THz radiation is generated by exciting an ultrafast spin current through femtosecond laser pulse in ferromagnetic-non magnetic heterostructures. Here, due to inverse spin Hall effect, the excited spin current results in an electromagnetic signal in the THz frequency range. Although an extensive phenomenological knowledge has been built through the last decade, a solid theoretical modeling that connects the generated signal to the laser induced-spin current is still incomplete. In this work, starting from general solutions to Maxwell equations, we model the electric field generated by a superdiffusive spin current in spintronic emitters. Additionally, effects due to the detector presence are also studied and taken into account, resulting in a good agreement between the predicted THz signal and the experimental measurements.

Keywords: Spintronics; Terahertz; inverse Spin Hall effect; Superdiffusion; Ultrafast demagnetization