Dresden 2026 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 30: Functional Antiferromagnetism

MA 30.8: Vortrag

Mittwoch, 11. März 2026, 11:30–11:45, POT/0151

Field-induced spin-reorientation transitions in collinear antiferromagnet Cr₂O₃ — •Paulina J. Prusik^1,2, Igor Veremchuk¹, Florin Radu³, Pavlo Makushko¹, Jürgen Fassbender^1,2, Kirill D. Belashchenko⁴, Denys Makarov¹, and Oleksandr V. Pylypovskyi¹ — ¹Helmholtz-Zentrum Dresden-Rossendorf e.V., 01328 Dresden, Germany — ²Dresden University of Technology, Dresden 01062, Germany — ³Helmholtz-Zentrum Berlin für Materialien und Energie, Berlin 12489, Germany — ⁴University of Nebraska-Lincoln, Lincoln, NE 68588, USA

We classify collinear antiferromagnets (AMFs) by presence in their σ-model of a term of exchange origin that couples the external magnetic field and gradients of the Néel vector. One representative material is the magnetoelectric, room-temperature, collinear AFM Cr₂O₃, which is promising for spintronics applications [1,2] as well as for fundamental research [3,4]. In Cr₂O₃ this term leads to a texture-induced magnetization with a finite component along the crystallographic c axis. By analyzing the field-induced spin-reorientation transitions, we find the appearance of a phase in which a field-induced domain wall lies in the basal plane at fields below the spin-flop field. The theoretical predictions are supported by X-ray magnetic linear dichroism measurements, which show that the transition field in thin films is reduced by nearly half compared to the single crystal. [1] Hedrich et al., Nat. Phys. 17, 574 (2021) [2] Rickhaus, Prusik et al., Nano Letters 24, 13172 (2024) [3] Makushko et al., Nat. Comm. 13, 6745 (2022) [4] Pylypovskyi et al., Phys. Rev. Lett. 132, 226702 (2024)

Keywords: Antiferromagnetism; chromium oxide; spin-flop transition; sigma model; domain walls