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MA: Fachverband Magnetismus

MA 16: Skyrmions I

MA 16.4: Vortrag

Dienstag, 10. März 2026, 10:15–10:30, HSZ/0004

observation of a distorted tilted conical spiral at the surface of Cu₂OSeO₃ — •Sina Mehboodi¹, Victor Ukleev², Chen Luo², Radu Abrudan², Florin Radu², Christian Back¹, and Aisha Aqeel³ — ¹School of Natural Sciences, Technical University of Munich, Garching, Germany — ²Helmholtz-Zentrum Berlin für Materialien und Energie, Berlin, Germany — ³Institute of Physics, University of Augsburg, Augsburg, Germany

Chiral magnets such as Cu₂OSeO₃ host a rich variety of noncollinear spin textures [1]. Using resonant elastic X-ray scattering (REXS), where the magnetic satellites are captured as scattered intensity on a CCD detector, we observed a well-ordered surface texture referred to as a distorted tilted conical (dTC) spiral phase. This phase displays strong anharmonicity, evidenced by pronounced higher-order magnetic satellites. Tilting the applied magnetic field causes a continuous reorientation of the dTC propagation vector and increases its modulation wavevector, revealing a high sensitivity of the surface spiral to field direction. Importantly, by combining REXS with rocking-curve analysis, we determine the full scattering vector of dTC, about 0.0718 nm⁻¹. This value is significantly smaller than the reported bulk TC wavevector (≈ 0.095 nm⁻¹) [2], providing direct evidence that the surface spiral is intrinsically distorted and cannot be explained by a simple bulk-like conical modulation [3].

[1] A. Aqeel, et al., Phys. Rev. Lett. 126, 017202 (2021). [2] E. Marchiori et al., Commun. Mater. 5, 202 (2024). [3] S. Mehboodi et al. Sci. Technol. Adv. Mater. 26, 2532366 (2025).

Keywords: Chiral magnet; Skyrmion; REXS; Tilted conical