SKM 2023 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 23: Poster Magnetism I

MA 23.56: Poster

Dienstag, 28. März 2023, 17:00–19:00, P1

Investigating spin dynamics in MoS₂/permalloy bilayers — •Rieke von Seggern, Lina Hansen, Jonathan Weber, Christopher Rathje, and Sascha Schäfer — Insitute of Physics, University of Oldenburg, Germany

For the successful integration of spin degrees of freedom in information processing devices, spin-injection into semiconductors plays a crucial role. It was recently demonstrated that an optically generated out-of-equilibrium spin population in a ferromagnetic metal can be efficiently transferred into an adjacent MoS₂ layer across its bandgap [1]. Due to the deflection of the spin current the bilayer then emits electromagnetic pulses in the terahertz (THz) domain analogous to the already established metallic spintronic THz emitters (STE) [2].

In this work, we explore the microscale THz emission properties of single-flake MoS₂/permalloy bilayer systems driven by ultrashort optical pulses (780-nm central wavelength, 70-fs pulse duration). We apply electro-optic sampling to measure the emitted THz electric field in the time domain. An optical excitation spot size in the micrometer range allows for a high spatial resolution of the sample’s emission features. With this approach a more detailed understanding of the underlying processes in these TMDC-based samples can be achieved.

[1] Cheng et al., Nat. Phys. 15, 347 (2019)

[2] Seifert et al., Nat. Photonics 10, 483 (2016)