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MA: Fachverband Magnetismus
MA 43: Spin-Dependent Phenomena in 2D
MA 43.6: Vortrag
Donnerstag, 12. März 2026, 11:00–11:15, POT/0112
Super-Moiré Spin Textures in Twisted 2D Antiferromagnets — •King Cho Wong1, Ruoming Peng1, Eric Anderson2, Jackson Ross3, Adam Wei Tsen4, Elton Santos3, Xiaodong Xu2, and Joerg Wrachtrup1 — 13rd Physics Institute, University of Stuttgart, Stuttgart, Germany — 2University of Washington, Seattle, USA — 3University of Edinburgh, Edinburgh, UK — 4University of Waterloo, Canada
Stacking two-dimensional (2D) layered materials offers a platform to engineer electronic and magnetic states. In general, the resulting states - such as Moiré magnetism - have a periodicity at the length scale of the Moiré unit cell. Here, we study magnetic order in twisted double bilayer chromium triiodide (tDB CrI3) by means of scanning nitrogen-vacancy microscopy. We observe long-range magnetic textures extending beyond the single Moiré unit cell, which we dub a super-Moiré magnetic state. At small twist angles, the size of the spontaneous magnetic texture increases with twist angle, opposite to the underlying Moiré wavelength. The spin-texture size reaches a maximum of about 300 nm in 1.1∘ twisted devices, an order of magnitude larger than the underlying Moiré wavelength. The vector field maps suggest the formation of antiferromagnetic Neel-type skyrmions spanning multiple Moiré cells. The twist angle dependent study combined with atomistic simulations suggests that magnetic competition between the Dzyaloshinskii-Moriya interaction, magnetic anisotropy, and exchange interactions produces the super-Moiré spin orders.
Keywords: Moiré materials; Skyrmions; NV centre; diamond scanning probe; 2D magnetism