Regensburg 2022 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 19: Poster 1

MA 19.25: Poster

Dienstag, 6. September 2022, 17:30–20:00, P2

Differential Phase Contrast and Lorentz microscopy — •Judith Bünte, Björn Büker, Daniela Ramermann, Inga Ennen, and Andreas Hütten — Universität Bielefeld, Dünne Schichten und Physik der Nanostrukturen, Universitätsstr. 25, 33615 Bielefeld, Germany

Differential Phase Contrast (DPC) and Lorentz microscopy are two well-known techniques for analyzing magnetic structures in the transmission electron microscope (TEM). The Lorentz force inside the magnetic domain of a specimen deflects the transmitted electron beam depending on the orientation of the corresponding magnetic field. This deflected beam then results in a different intensity distribution in the recorded image which can be analyzed. In this contribution we present DPC and Lorentz transmission electron microscope (LTEM) images of a specimen consisting of a CoFe membrane with structured holes. These different kinds of holes inside the magnetic material of the specimen yield interesting domain structures. The focus is on the analysis of these magnetic domain structure and the impact of changing external magnetic fields. For this, a hysteresis loop inside the TEM is recorded. Furthermore, the two different techniques are compared giving the possibility to confirm the resulting domain structure.