Regensburg 2022 – scientific programme

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O: Fachverband Oberflächenphysik

O 53: Poster Wednesday: Spins and Magnetism

O 53.5: Poster

Wednesday, September 7, 2022, 18:00–20:00, P4

Imaging fast magnetization dynamics by Lorentz microscopy with event-based electron detectors — •Alexander Schröder, Christopher Rathje, Xinlai Xing, and Sascha Schäfer — Institute of Physics, University of Oldenburg, Germany

In recent years, ultrafast transmission electron microscopy (UTEM) [1] has successfully enabled the imaging of ultrafast dynamics on the nanoscale by utilizing femtosecond electron pulses in an optical-pump/electron-probe approach. In a potentially more flexible approach, instead of femtosecond electron pulses, a continuous electron beam could be used to map the optically induced dynamics provided sufficiently fast, event-based electron detectors are employed.

Here, we present Lorenz microscopy of nanoscale magnetic dynamics observed with a Timepix3 hybrid pixel electron detector. In particular, we study the distortion of magnetic vortices triggered by femtosecond optical pulses, accessing reversible processes on time scales ranging from nanoseconds to milliseconds.

[1] A. Feist et al., Ultramicroscopy 176, 63 (2017).