Regensburg 2019 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 15: Magnetism Poster A
MA 15.50: Poster
Dienstag, 2. April 2019, 10:00–13:00, Poster E
Imaging domain wall motion using time-resolved SEMPA — •Daniel Schönke1, Andreas Oelsner2, Pascal Krautscheid1,3, Robert Reeve1,3, and Mathias Kläui1,3 — 1Institut für Physik, Johannes Gutenberg-University, 55128 Mainz, Germany — 2Surface Concept GmbH, 55099 Mainz, Germany — 3Graduate School of Excellence Materials Science in Mainz (MAINZ), 55128 Mainz, Germany
Scanning electron microscopy with polarization analysis (SEMPA) is a magnetic imaging technique with a high spatial resolution. While conventional setups only provide quasi-static imaging modes, which have limited the adoption of the technique, recent developments have enabled dynamic measurements and allow SEMPA to favorably compete with a range of synchrotron based techniques [1]. Here we show that with our upgraded SEMPA system we can perform new time-resolved imaging schemes including phase-sensitive detection of periodically changing magnetic states with up to 5x demonstrated enhanced signal-to-noise ratio and full dynamic imaging with a temporal resolution of 2 ns [2]. This novel SEMPA system can be used for a variety of measurement applications and fulfills the desire for high spatial and temporal resolution in a laboratory setting. We take advantage of the new system to study geometry-induced automotive domain wall dynamics in asymmetric permalloy rings [3] at different temperatures. [1] Frömter et al., Appl. Phys. Lett. 108, 142401 (2016) [2] Schönke et al., Rev. Sci. Instrum. 89, 083703 (2018) [3] Mawass et al., Phys. Rev. Applied 7, 044009 (2017)