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MA: Fachverband Magnetismus

MA 6: Skyrmions I

MA 6.3: Vortrag

Montag, 17. März 2025, 15:45–16:00, H16

Skyrmion Screws: A Novel 3D Topological Spin Texture — •Thorsten Hesjedal^1,2, Gerrit van der Laan², Haonan Jin^3,4, Jingyi Chen^3,4, and Shilei Zhang^3,4 — 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