Dresden 2026 – wissenschaftliches Programm

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FM: Fachverband Funktionsmaterialien

FM 23: Focus Session: (Anti)ferroic states – Magnetic and magnetoelectric III (joint session FM/MA)

FM 23.1: Hauptvortrag

Freitag, 13. März 2026, 09:30–10:00, BEY/0E40

Mapping topological textures in compensated magnets with X-rays — •Claire Donnelly — Max Planck Institute for Chemical Physics of Solids, Dresden, Germany

Extending spin systems to three dimensions promise significant opportunities for applications, for example providing higher density devices and new functionalities associated with complex topology and greater degrees of freedom. Until now, however, insight into three dimensional spin systems has mainly been limited to ferromagnetic and ferrimagnetic systems through X-ray magnetic tomography [1], where a variety of topological textures [1,2], as well as 3D dynamics [3,4], have been observed. In this talk I will describe our recent work mapping topological textures in compensated systems. I will first describe the development of X-ray linear orientation tomography [5], which we have harnessed to map three-dimensional orientation fields - both crystallographic [5], and antiferromagnetic - at the nanoscale. Second, I will present our recent mapping of topological textures in altermagnets [6], harnessing both X-ray circular and linear magnetic dichroism. These insights into the formation of topological textures in compensated magnets not only paves the way for enhanced understanding of these systems, but also towards the next generation of technological devices.

[1] C. Donnelly et al., Nature 547, 328 (2017). [2] C. Donnelly et al., Nat. Phys. 17, 316 (2021) [3] C. Donnelly et al., Nature Nanotechnology 15, 356 (2020). [4] S. Finizio et al., Nano Letters (2022) [5] A. Apseros et al., Nature 636, 354 (2024) [6] R. Yamamoto et al., Phys. Rev. Appl. 24, 034037 (2025)

Keywords: X-ray magnetic dichroism; Three dimensional nanomagnetism; tomography