Regensburg 2025 – scientific programme
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MA: Fachverband Magnetismus
MA 48: Ultrafast Magnetization Effects II
MA 48.6: Talk
Friday, March 21, 2025, 12:30–12:45, H20
THz emission control in exchange-coupled spintronic emitters. — •Roman Adam1, Derang Cao1,2, Daniel Bürgler1, Sarah Heidtfeld1, Christian Greb1, Fangzhou Wang1, Debamitra Chakraborty3, Jing Cheng3, Ivan Komissarov3, Markus Büscher1, Martin Mikulics4, Hilde Hardtdegen4, Roman Sobolewski3, and Claus Schneider1 — 1Research Centre Jülich, Peter Grünberg Institute (PGI-6), 52425 Jülich, Germany — 2College of Physics, Qingdao University, 266071 Qingdao, China — 3University of Rochester, Rochester, New York 14627-0231, USA — 4Research Centre Jülich, Ernst Ruska Centre (ERC-2), 52425 Jülich, Germany
Optical laser pulses impinging at the ferromagnet/metal thin film stacks can generate a pico-second electro-magnetic transients with frequency content extending into THz frequency range. We fabricated Si/SiO2//Ta/Fe/Ru/Ni/Al2O3 and Si/SiO2//Pt/Fe/Cr/Fe/Pt spintronic THz emitters in which we varied interlayer exchange coupling between the ferromagnetic thin films by varying the thicknesses of either the Ru or Cr spacer layer. As a result, THz emission shows a dramatic variation of amplitude in weak external magnetic fields due to an interference of THz transiens generated at the individual Fe/Ru, Ru/Ni or Fe/Pt emitters. We explore the effect of the ambient temperature and the spacer layer thickness variations on the THz amplitude.
Keywords: THz spintronic emitter; ferromagnetic thin film; interlayer exchange coupling; laser excitation