Regensburg 2025 – scientific programme
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MA: Fachverband Magnetismus
MA 43: Skyrmions III / Non-Skyrmionic Magnetic Textures II
MA 43.11: Talk
Friday, March 21, 2025, 12:15–12:30, H16
Shape anisotropy in helimagnets — •Jan Masell1, Maurice Colling2, Mariia Stepanova2, Mario Hentschel3, and Dennis Meier2 — 1Karlsruhe Institute of Technology, Karlsruhe, Germany — 2NTNU Norwegian University of Science and Technology, Trondheim, Norway — 3University of Stuttgart, Stuttgart, Germany
In chiral magnets, the competition between ferromagnetic exchange and Dzyaloshinskii-Moriya interaction (DMI) stabilizes a long-ranged helical state as the ground state. The orientation and pitch of the helix is described by the q-vector. For isotropic model systems, the q-vector can point in any direction while in real materials its orientation is pinned by anisotropies, such as exchange or single ion anisotropy.
In this talk, I will discuss the impact of the shape of the magnet on the orientation of the helical phase. While shape anisotropy is a well-established phenomenon in ferromagnets, its role in chiral magnets remains less explored. I will present our theoretical results for a new type of DMI-shape-anisotropy for non-trivial magnetic textures, caused by the competition between standard shape anisotropy and the chiral surface twist inherent to systems with DMI. Our experimental data on FeGe confirm the existence of such non-trivial anisotropy, challenging present models for magnetic textures in nanostructures with DMI.
Keywords: Nanostructures; Chiral magnet; helical phase; DMI; shape anisotropy