Regensburg 2025 – scientific programme
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MA: Fachverband Magnetismus
MA 6: Skyrmions I
MA 6.3: Talk
Monday, March 17, 2025, 15:45–16:00, H16
Skyrmion Screws: A Novel 3D Topological Spin Texture — •Thorsten Hesjedal1,2, Gerrit van der Laan2, Haonan Jin3,4, Jingyi Chen3,4, and Shilei Zhang3,4 — 1Department of Physics, Clarendon Laboratory, University of Oxford, Oxford OX1 3PU, UK — 2Diamond Light Source, Harwell Science and Innovation Campus, Didcot OX11 0DE, UK — 3School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China — 4ShanghaiTech Laboratory for Topological Physics, ShanghaiTech University, Shanghai 201210, China
Three-dimensional (3D) magnetic skyrmions have attracted increasing interest as topological spin textures capable of hosting emergent electromagnetic properties and unique spin dynamics. In this study, we present the first direct experimental observation of skyrmion screws — a 3D spin crystal featuring modulations along the z-axis. Using state-of-the-art soft x-ray ptycho-tomography, we fully visualize the skyrmion screw lattice in a Co8Zn10Mn2 thin lamella, fabricated to induce boundary confinement effects. Ferromagnetic resonance spectroscopy and micromagnetic simulations reveal a distinct low-frequency resonance mode, establishing skyrmion screws as a fundamentally new phase. These findings open avenues for studying 3D topological magnetism and its applications in magnonics and spintronics.
Keywords: 3D topological spin textures; Chiral magnets; Skyrmions; Soft x-ray ptycho-tomography; Ferromagnetic resonance