Regensburg 2025 – scientific programme

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MA: Fachverband Magnetismus

MA 41: Poster III

MA 41.38: Poster

Thursday, March 20, 2025, 15:00–17:30, P3

Resonant X-ray Elastic Scattering of Chiral Magnets — Sina Mehboodi^1,3, •Mathew James⁴, Victor Ukleev², Chen Luo², Florin Radu², Christian H Back^1,3, and Aisha Aqeel^1,3,4 — ¹Physik-Department, Technische Universität München, D-85748 Garching, Germany — ²Helmholtz-Zentrum Berlin für Materialien und Energie, Berlin, Germany — ³Munich Center for Quantum Science and Technology (MCQST), München, Germany — ⁴University of Augsburg, Augsburg, Germany

Resonant Elastic X-ray Scattering (REXS) is an element specific synchrotron X-ray technique that combines diffraction and spectroscopy. It can be used to study complex magnetic materials and provides a sensitive probe for the spatial modulation of spin configuration. This technique has been used to explore a chiral magnet Cu₂OSeO₃. Cu₂OSeO₃ is a unique magnetic insulator that exhibits a complex spin configuration, including helices, conical spirals, and skyrmions. We studied the skyrmion phase and the tilted cone phase of the high-quality single crystal Cu₂OSeO₃ at low temperature [1] using the REXS technique, which occurs when the energy of the incident X-ray photon is matched near the absorption edge of a magnetic element, in this case Cu. We carried out all the experiments by tuning the photon energy to the L₃ edge of Cu. We can directly observe the magnetic diffraction pattern caused by the magnetic arrangement of Cu²⁺ ions in different phases of Cu₂OSeO₃.

[1] A. Aqeel et al., Physical Review Letters 126, 017202 (2021)

Keywords: Resonant Elastic X-ray Scattering; Chiral magnets; Magnetic insulator; Magnetic textures; Skyrmions