SKM 2021 – scientific programme
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MA: Fachverband Magnetismus
MA 11: Posters Magnetism III
MA 11.22: Poster
Wednesday, September 29, 2021, 13:30–16:30, P
Spintronic THz emitters tuned with Ta and modified interface qualities — •Laura Scheuer1, Dominik Sokoluk2, Garik Torosyan3, René Beigang1, Marco Rahm2, and Evangelos Papaioannou4 — 1Fachbereich Physik and Landesforschungszentrum Optimas, TUK, Kaiserslautern, Germany — 2Fachbereich Elektrotechnik, TUK, Kaiserslautern, Germany — 3Photonic Center Kaiserslautern, Kaiserslautern, Germany — 4Institut of Physics, MLU, Halle-Wittenberg, Germany
THz emission from metallic thin film multilayers interlinked the field of ultrafast spintronics and the field of THz optics, raising new fascinating research subjects. In principle, the THz pulse is generated by a spin current. This spin current is excited in a ferromagnetic layer by a fs laser pulse and diffuses into the adjacent layers. Usually their material is chosen to have a high spin-orbit coupling to provide a strong spin-to-charge conversion via the spin-Hall effect, resulting in a transient charge current. These accelerated electrons emit a radiation in the THz range.
Our recent experiments concentrate on materials different from our well-studied Fe/Pt-bilayers: Firstly, as Ta is a material with high spin-orbit coupling and a spin-Hall angle opposite to Pt's, we did not only replace Pt in bilayers but also added Ta as a second non-magnetic layer. Additionally we extended our investigations regarding the role of the interface to interfaces 'dusted' with Au and Cu, meaning they are grown thin enough not to form a whole monolayer.