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MA: Fachverband Magnetismus
MA 59: Posters Magnetism III
MA 59.14: Poster
Freitag, 20. März 2020, 09:00–12:00, P2/EG
Topological Defects in Helimagnetic Spin Textures — •Erik Lysne1,2, Mariia Stepanova1,2, Peggy Schoenherr3, Jan Masell4, Laura Köhler2,5, Achim Rosch6, Naoya Kanazawa7, Yoshinori Tokura4,7, Markus Garst8, and Dennis Meier1,2 — 1NTNU, Trondheim, Norway — 2QuSpin NTNU, Trondheim, Norway — 3ETH Zurich, Zürich, Switzerland — 4RIKEN , Wako, Japan — 5Technische Universität Dresden, Dresden, Germany — 6Universität zu Köln, Köln, Germany — 7University of Tokyo, Tokyo, Japan — 8Karlsruhe Institute of Technology, Karlsruhe, Germany
In non-centrosymmetric ferromagnets, the Dzyaloshinskii-Moriya interaction is symmetry-allowed and the magnetic energy can be reduced by canting the spins, resulting in complex spin spiral structures. Examples include transition-metal silicides and germanides, which crystallize in the B20 structure. Among the B20 magnets, the highest known transition temperature is found in FeGe, which also has a remarkably low magnetic anisotropy. Because of this low anisotropy, the orientation of the helix can assume any direction in the surface plane. Most interestingly, completely new types of domain walls emerge between regions with different orientation of the helical structure in the ground state. These novel helimagnetic domain walls have interesting and unusual physical properties, such as non-trivial topology. Furthermore, they bear a striking resemblance to cholesteric liquid crystals, but on a very different length scale. We use magnetic force microscopy to investigate these domain walls and associated defects, with the goal of demonstrating new opportunities for future spintronic applications.