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MA: Fachverband Magnetismus
MA 30: Functional Antiferromagnetism
MA 30.6: Vortrag
Mittwoch, 11. März 2026, 10:45–11:00, POT/0151
Investigation of magnetic symmetries and domain imaging in antiferromagnetic Mn2As via methods of electron microscopy — •Oleksandr Zaiets1, 2, Kamil Olejník3, Filip Křížek3, Jose Angel Castellanos-Reyes4, Jan Rusz4, Darius Pohl2, and Axel Lubk1, 2 — 1IFW Dresden, Germany — 2TU Dresden, Germany — 3Institute of Physics of the Czech — 4Uppsala University, Sweden
Antiferromagnets are promising candidates for spintronic applications due to their ultrafast dynamics, low magnetic susceptibility, and lack of stray fields. Their switching behaviour is determined by the undisturbed antiferromagnetic ordering, the distribution of magnetic defects (notably domain walls) and their pinning to structural defects of the underlying crystal structure.
In this work we investigate antiferromagnetic Mn2As thin films epitaxially grown on GaAs via methods of transmission electron microscopy, in particular high resolution imaging and electron diffraction. The antiferromagnetic ordering of Mn2As entails a doubled magnetic unit cell compared to the structural one. This allows us to study purely magnetic Bragg reflections. The analysis of these reflections suggests the presence of a previously unknown antiferromagnetic phase. We furthermore reveal the presence of an antiferromagnetic domain structure by mapping the intensity of these reflections. We discuss stabilization mechanisms of this new AF ordering with the help of ab-initio methods. The strength of the antiferromagnetic signal is sufficient for domain mapping with sub-nanometer scale.
Keywords: TEM; Antiferromagnets; Domains; Magnetism; Mn2As