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MA: Fachverband Magnetismus

MA 18: Functional Antiferromagnetism

MA 18.4: Vortrag

Dienstag, 18. März 2025, 14:45–15:00, H19

Domain walls properties and spin-flop transition in Cr₂O₃ — •Paulina J. Prusik^1,2, Igor Veremchuk¹, Florin Radu³, Andrey N. Anisimov¹, Pavlo Makushko¹, Georgy V. Astakhov¹, Sophie F. Weber⁴, René Hübner¹, Nicola A. Spaldin⁴, Kirill D. Belashchenko⁵, Jürgen Fassbender^1,2, Denys Makarov¹, and Oleksandr V. Pylypovskyi¹ — ¹Helmholtz-Zentrum Dresden-Rossendorf e.V. — ²Dresden University of Technology, 01062 Dresden, Germany — ³Helmholtz-Zentrum Berlin für Materialien und Energie, 14109 Berlin, Germany — ⁴ETH Zürich, 8093 Zürich, Switzerland — ⁵University of Nebraska-Lincoln, Lincoln, NE 68588, USA

A room-temperature magnetoelectric uniaxial antiferromagnet Cr₂O₃ is a prospective material for spintronics and fundamental research [1,2]. We derive a σ-model for Cr₂O₃ and show the presence of a symmetry-breaking term relevant for non-collinear magnetic textures. It couples the magnetic field with a gradient of the Néel vector. Analyzing quantum magnetometry images of antiferromagnetic domain walls, we can properly describe the material parameters of Cr₂O₃. Furthermore, this term results in lowering of the spin-flop field for thin films of Cr₂O₃ by a factor of two comparing with single crystals. This finding is confirmed by X-ray magnetic linear dichroism measurements.

[1] J. Han et al., Nat. Mater. 22 (2023) 684; He et al, Nat. El. (2024) [2] P. Makushko et al., Nat. Comm. 13, 6745 (2022); O.V. Pylypovskyi et al., Phys. Rev. Let. 132, 226702 (2024); S.F. Weber et al., Phys. Rev. Lett. 130, 146701 (2023)

Keywords: Antiferromagnetism; domain walls; spin-flop transition; ferrotoroidicity