Dresden 2020 – scientific programme
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MA: Fachverband Magnetismus
MA 63: Spin: Transport, Orbitronics and Hall Effects III
MA 63.7: Talk
Friday, March 20, 2020, 11:00–11:15, HSZ 403
THz emission from XUV pumped spintronic tri-layer emitter: A prospective timing tool for FELs — •Naman Agarwal1, Igor Ilyakov2, Robert Carley1, Jan-Christoph Deinert2, Alexander Yaroslavtsev1, Jia Liu1, Loic le Guyader1, Gabor Kurdi3, Laura Foglia3, Riccardo Mincigrucci3, Emiliano Principi3, Tobias Kampfrath4,5, Sergey Kovalev2, Michael Gensch6,7, and Andreas Scherz1 — 1European XFEL GmbH, Schenefeld, Germany — 2TELBE, HZDR, Dresden, Germany — 3EIS-TIMEX, FERMI, Trieste, Italy — 4Freie Universität Berlin, Germany — 5Fritz-Haber-Institut, Berlin, Germany — 6Technischen Universität Berlin, Germany — 7DLR, Berlin, Germany
We demonstrate the strong broadband THz emission from spintronic trilayer (W/CoFeB/Pt) excited by XUV wavelengths. We discuss the possible mechanisms of generation of THz emission.
Further, in our timing diagnostics scheme, we demonstrate few-femtosecond arrival-time measurements based on single-shot electro-optic sampling(EOS) of broadband THz emission from an XUV-pumped spintronic THz emitter. Experiments were performed at the EIS-TIMEX beamline of FERMI, Italy. Using a spectral-encoding scheme for EOS, we were able to measure the arrival time with 20fs resolution, which compares well with other techniques.This technique requires very small fluence (10 uJ/cm^2), compared to other techniques(transient reflectivity) requiring 10 mJ/cm^2.We discuss possible improvements of this scheme, and how it can be combined with other scientific objectives.