Dresden 2026 – scientific programme

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MA: Fachverband Magnetismus

MA 33: Altermagnets IV

MA 33.2: Talk

Wednesday, March 11, 2026, 15:15–15:30, HSZ/0002

Skyrmion dynamics in altermagnets — •Nicolai Timon Bechler and Jan Masell — Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany

Altermagnetism is a new type of magnetic order that combines the time-reversal symmetry breaking nature of ferromagnetism with the stray-field free nature of antiferromagnetism. [1] Altermagnets can host skyrmions - whirling magnetic textures that are characterized by an integer real-space topological winding number. In d-wave altermagnets, the skyrmions in both sublattices are elliptical, related by lattice symmetries, and the total winding number vanishes as the contributions of each sublattice cancel each other. In this talk, we explore the motion of skyrmions in d-wave altermagnets, driven by either spin transfer torque (STT) or a magnon current. We combine an analytical collective-coordinate approach with high-precision micromagnetic simulations. Our findings predict that the anisotropic skyrmion profile yields a genuine Hall response beyond conventional Zhang-Li STT. In turn, standard Zhang-Li STT yields no Hall-signal but large artifacts in simulations which were previously misinterpreted as a physical Hall effect. [2] Furthermore, we show that for a system driven by a magnon current, the anisotropic scattering cross-sections immediately lead to a skyrmion Hall effect.

[1] L. Šmejkal et al., Emerging Research Landscape of Altermagnetism. Phys. Rev. X 12, 040501 (2022). [2] Z. Jin et al., Skyrmion hall effect in altermagnets. Phys. Rev. Lett. 133, 196701 (2024).

Keywords: Altermagnets; Skyrmions; Skyrmion Hall effect; Spin transfer torque; Magnon dynamics