Regensburg 2022 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

O: Fachverband Oberflächenphysik

O 53: Poster Wednesday: Spins and Magnetism

O 53.5: Poster

Mittwoch, 7. September 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).