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MA: Fachverband Magnetismus

MA 7: Poster Magnetism I

MA 7.69: Poster

Montag, 9. März 2026, 09:30–12:30, P2

Rotating Skyrmion Lattice by Circularly Polarized Light — •Reza Doostani and Achim Rosch — University of Cologne, Cologne, Germany

Previously, it has been studied that shining a circularly polarized light on a skyrmion crystal (SkX) induces rotation in the lattice. This is due to Inverse Faraday Effect where spins experience local magnetic field. The magnitude of rotation depends on the fluence of light and its polarization. There exist a fluence threahold under which the SkX does not rotate. Further, one can start and stop the rotation by doing double pulse laser experiment and changing the separation time between two pulses. These results has been theoretically described where coherent oscillation of rotation amplitude as a function of pulse separation matches the experimental observation. However the theoretical value for rotation amplitude (for clean system) is orders of magnitude smaller than experimental value. Previously, the only source of rotation was due to Gilbert damping, however this cannot describe the rotation alone. In this work, we investigate other source of rotation in this system, namely we induce disorder and analyze its effect.

Keywords: Skyrmion; Inverse faraday effect; Magnetism; Active; Gilbert damping