Regensburg 2022 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 12: Skyrmions 1 (joint session MA/KFM)

KFM 12.6: Vortrag

Dienstag, 6. September 2022, 11:00–11:15, H37

Small-angle neutron scattering of kinetically driven skyrmion lattice motion — •Denis Mettus¹, Alfonso Chacon¹, Andreas Bauer¹, Sebastian Mülbauer², and Christian Pfleiderer¹ — ¹Physik-Department, Technische Universität München, D-85748 Garching, Germany — ²Heinz Maier-Leibnitz Zentrum (MLZ), Technische Universität München, Garching, Germany

Skyrmions are topologically non-trivial spin textures that exhibit an exceptionally efficient coupling to spin currents, notably spin-polarized charge currents and magnon currents as observed in MnSi, FeGe, and Cu₂OSeO₃. This raises the question for the microscopic mechanisms that control the pinning of the skyrmion lattice, and how they depend on the topology, electronic structure, and disorder. We report neutron scattering measurements of kinetically driven skyrmion lattice unpinning and motion by means of Time-Involved Small Angle Neutron scattering Experiment (TISANE). In our study we examined the unpinning process under changing field orientation for different materials including the metallic systems Mn_1−xFe_xSi and the insulator Cu₂OSeO₃. We discuss our results in the light of methodological aspects of the TISANE technique and recent theoretical predictions of walking skyrmions.