SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 23: Poster Magnetism I
MA 23.15: Poster
Dienstag, 28. März 2023, 17:00–19:00, P1
Magnetic hopfions in frustrated magnets — •Sandra Chulliparambil Shaju1, Ross Knapman1, Riccardo Hertel2, and Karin Everschor-Sitte1 — 1Faculty of Physics and CENIDE, University of Duisburg-Essen, 47057 Duisburg, Germany — 2Université de Stras- bourg, CNRS, Institut de Physique et Chimie des Matériaux de Stras- bourg, F-67000 Strasbourg, France
Research in 3D nanomagnetism, driven by advanced nanofabrication methods [1] and novel experimental 3D magnetization visualization methods [2], has revealed new nanostructures and physics beyond those in 1D and 2D. Magnetic Hopfions are topological magnetic textures that can be considered as closed loops of twisted Skyrmion strings [3]. The number of twists and knots of the Hopfion is characterized by the Hopf index. Both Skyrmions and Hopfions require the interplay of competing interactions to stabilize them. In contrast to Skyrmions, which can be stabilized, for example, by the competition of inversion symmetry-breaking Dzyaloshinskii-Moriya interactions and standard exchange interactions, Hopfions require competing exchange interac- tions beyond second-order derivatives [3,4]. We consider frustrated magnets that obey the interplay of such competing exchange interac- tions and want to investigate the physics of three-dimensional topo- logical structures.
[1] P. Fischer et al., APL Mater. 8, 010701 (2020).
[2] C. Donnelly et al., Nature 547, 328 (2017).
[3] P. Sutcliffe, Phys. Rev. Lett. 118, 247203 (2017).
[4] F. N. Rybakov et al., APL Mater. 10, 111113 (2022).