Regensburg 2022 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 21: Terahertz Spintronics
MA 21.10: Vortrag
Mittwoch, 7. September 2022, 11:45–12:00, H43
Ultrafast spintronic THz emission of thin CoFe/Pt films — •Jannis Bensmann1, Robert Schneider1, Mario Fix2, Steffen Michaelis de Vasconcellos1, Manfred Albrecht2, and Rudolf Bratschitsch1 — 1University of Münster, Institute of Physics and Center for Nanotechnology, 48149 Münster, Germany — 2University of Augsburg, Institute of Physics, 86159 Augsburg, Germany
THz radiation has great potential for spectroscopy, security and quality control applications. Recently, ultrafast spintronic THz emitters gained a lot of interest, as they are easy to handle and show high power and broadband emission. In these emitters, an ultrafast laser pulse launches a spin-polarized current from a nanometer-thin magnetic film into a non-magnetic metal layer. Due to the inverse spin Hall effect and the conversion to an ultrafast charge current, THz radiation is created. The THz emission of spintronic emitters can be tuned by the material compositions of the layers.
Here we present our recent results on THz emission spectroscopy of ultrathin CoxFe1-x/Pt bilayers with varying Co content x. The THz amplitude changes only slightly with x, leading to the conclusion that both Fe and Co have a similar contribution to the THz generation process [1]. Moreover, we were able to boost the THz emission by using multilayer stacks of the mentioned structure.
[1] R. Schneider et al., "Composition-dependent ultrafast THz emission of spintronic CoFe/Pt thin films", Appl. Phys. Lett. 120, 042404 (2022)