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MA: Fachverband Magnetismus

MA 63: Spin: Transport, Orbitronics and Hall Effects III

MA 63.7: Vortrag

Freitag, 20. März 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 Kampfrath^4,5, Sergey Kovalev², Michael Gensch^6,7, 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.