Regensburg 2025 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 6: Skyrmions I

MA 6.1: Hauptvortrag

Montag, 17. März 2025, 15:00–15:30, H16

Magnetization dynamics of chiral helimagnetic insulators — •Aisha Aqeel — University of Augsburg, Augsburg, Germany — Technical University of Munich, Munich, Germany — Munich Center for Quantum Science and Technology (MCQST), Munich, Germany

Nature reveals fascinating patterns, often arising from intricate interactions among individual components. In magnets, remarkable patterns can emerge even in the absence of inversion symmetry. Chiral helimagnets, characterized by their twisted magnetic structures, whether topologically trivial or non-trivial, exhibit collective magnetic excitations ranging from GHz to THz. These exceptional properties make helimagnets highly attractive for spintronic technologies and unconventional computing [1]. However, realizing their full potential demands ultraclean magnetic systems with minimal dissipation and a deep understanding of their magnetization dynamics. In this talk, I will delve into the fundamental properties of chiral helimagnets and their dynamic magnetization behavior, focusing on the insulating material Cu2OSeO3. Our studies reveal evidence for a rare magnetic state in Cu2OSeO3 crystals - elongated skyrmions - observed through magnetic resonance experiments [2]. Additionally, utilizing a surface-sensitive electrical probe - spin Hall magnetoresistance - we discovered that the magnetic configurations at the surfaces of chiral magnets deviate significantly from those in the bulk [3].

[1] O. Lee, et al., Nat. Mater. 23(1), 79-87 (2024). [2] A. Aqeel, et al., Phys. Rev. Lett. 126(1), 017202 (2021). [3] A. Aqeel, et al., Phys. Rev. B 103(10), L100410 (2021).

Keywords: Spin-Hall magnetoresistance; Non-collinear magnets; Ferromagnetic resonance; Magnetization dynamics; Skyrmions