Regensburg 2022 – scientific programme
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MA: Fachverband Magnetismus
MA 19: Poster 1
MA 19.52: Poster
Tuesday, September 6, 2022, 17:30–20:00, P2
Orbitronic influences on spintronic THz emitters — •Julien Schäfer, Laura Scheuer, Philipp Pirro, and Burkard Hillebrands — TU Kaiserslautern, Kaiserslautern, Deutschland
Magnetic / non-magnetic thin film bilayers were recently introduced as novel sources of THz radiation: A fs laser pulse generates a spin current in the ferromagnetic layer which diffuses into the non-magnetic layer. Usually, the non-magnetic layer is chosen to exhibit a high spin-orbit coupling in order to efficiently transform the spin current into a charge current via the inverse spin-Hall effect. The accelerated electrons of the transient charge current then emit a broadband radiation in the THz regime.
The orbital Hall effect is reported to be remarkably long-ranged in ferromagnets and to generate considerate spin-orbit torques on CuOX/Pt interfaces [1]. Therefore, we investigated Co/Pt-emitters in various combinations with CuOX and Al2O3 as an insulator barrier to extract the influence of a potential inverse orbital Hall effect on the THz emission.
The exploitation of the inverse orbital Hall effect opens new perspectives in terms of material choices for the next generation of spintronic THz emitters.
[1]: D. Go et al.: Long-Range Orbital Transport in Ferromagnets, arXiv:2106.07928
[cond-mat.mes-hall] (2022)