Regensburg 2022 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 18: Spintronics
MA 18.1: Vortrag
Dienstag, 6. September 2022, 15:00–15:15, H47
Multilayer on-chip spintronic THz emitters — •Wolfgang Hoppe1, Mohamed Amine Wahada2, Stuart S. P. Parkin2, and Georg Woltersdorf1 — 1Institute of Physics, Martin Luther University Halle-Wittenberg, Von-Danckelmann-Platz 3, 06120 Halle, Germany — 2Max Planck Institute for Microstructure Physics, Weinberg 2, 06120 Halle, Germany
Nanometer thin ferromagnet/heavy metal bilayers illuminated by intense, short laser pulses have proven to be a reliable source for THz emission [1]. When integrated into a gold waveguide structure, the bilayer can be used as an on-chip source for ultrafast current pulses, ranging from the GHz to the THz regime [2]. One possible application is the switching of the magnetization of an adjacent magnetic layer [3]. A way to achieve the needed threshold current density is by increasing the amplitude of the current-pulses. This can be accomplished by stacking the bilayers, each separated by a thin MgO interlayer impeding the formation of any spin-currents in between the individual bilayers [4]. Here, the charge current in all bilayers can add, leading to an enhanced signal. We demonstrate an increase by a factor of three for the optimal stacking configuration. The multilayers are investigated by electro-optic sampling.
[1] Seifert et al. Nature Photon 2016, 10, 483-488
[2] W. Hoppe et al. ACS Appl. Nano Mater. 2021, 4, 7, 7454-7460
[3] Y. Yang et al. Sci. Adv. 2017, 3, 11
[4] M. A. Wahada et al. ACS Nano Lett. 2022, 22, 9, 3539-3544