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MA: Fachverband Magnetismus
MA 37: Non-Skyrmionic Magnetic Textures
MA 37.6: Talk
Wednesday, March 11, 2026, 16:15–16:30, POT/0351
Control of helix orientation in chiral magnets via lateral confinement — •Maurice Colling1, Mariia Stepanova1, Mario Hentschel2, Erik Lysne1, Kasper Hunnestad1, Naoya Kanazawa3, Yoshinori Tokura3,4, Jan Masell4,5, and Dennis Meier1 — 1Department of Materials Science and Engineering, NTNU Norwegian University of Science and Technology, Trondheim, Norway — 2Physics Institute and Research Center SCoPE, University of Stuttgart, Stuttgart, Germany — 3Department of Applied Physics, University of Tokyo, Tokyo, Japan — 4RIKEN Center for Emergent Matter Science (CEMS), Wako, Japan — 5Institute of Theoretical Solid State Physics, Karlsruhe Institute of Technology, Karlsruhe, Germany
Helimagnetic materials offer a versatile platform for spin-based device concepts due to their long-range, tunable spiral order. This talk demonstrates control of the helimagnetic propagation vector q via geometrical confinement, using FeGe as a model DMI-driven chiral magnet. Micromagnetic simulations based on the nonlinear sigma model show that open boundaries generate a chiral surface twist that acts as an effective surface anisotropy selecting the helix orientation. This behavior is captured well by an analytical model derived from the DMI boundary condition. Magnetic force microscopy on focused ion beam structured FeGe confirms the predicted orientation and establishes geometry-controlled helimagnetic order as a robust mechanism for steering DMI-stabilized spin-spiral states. The concept provides a route to device-level control of chiral magnetic textures.
Keywords: Helimagnetism; Dzyaloshinskii–Moriya Interaction; Chiral surface twist; Micromagnetic simulations; Nanostructures