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Berlin 2024 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 47: Poster III

MA 47.15: Poster

Donnerstag, 21. März 2024, 15:00–18:00, Poster D

Quantitative evaluation of disordered remagnetization processes by Kerr microscopy — •Xian Yue Ai1, Ivan Soldatov2, Leon Oleschko1, Rudolf Schäfer2, and Sebastian T.B. Goennenwein11Department of Physics, University of Konstanz, Germany — 2Institute for Emerging Electronic Technologies, IFW Dresden, Germany

A quantitative understanding of magnetic domain wall (DW) nucleation and propagation is important not only from a scientific perspective, but also for applications, e.g., in magnetic data storage devices. To date, DW velocity experiments often focus on one single propagation direction, and rely on magnetic field pulses to induce a step-wise DW motion. Strongly disordered, statistic magnetization dynamics remains a topic addressed mostly via simulations and theory.In our study, we use series of Kerr microscopy images taken as a function of time at constant magnetic field to explore re-magnetization in Pt/Co/AlOx thin films with perpendicular magnetic anisotropy. Inevitable mechanical vibrations and camera noise impede a direct spatially resolved analysis of re-magnetization in the creeping regime. To mitigate these issues, we have developed an approach based on analytical image processing techniques in combination with a correlation-based computational scheme. Our analysis scheme thus enables a quantitative categorization of highly disordered magnetization dynamics with unprecedented resolution. Our technique can be straightforwardly implemented in modern Kerr microscopes, opening interesting perspectives for magnetic material analysis.

Keywords: Microscopy; DW velocities; strongly disordered dynamics

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