Berlin 2018 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 4: Skyrmions I (joint session MA/KFM/TT)

KFM 4.9: Vortrag

Montag, 12. März 2018, 17:30–17:45, EB 301

Time resolved Lorentz-TEM measurements of dynamical skyrmion lattice defects in Cu₂OSeO₃ — •Simon Pöllath¹, Johannes Wild¹, Lukas Heinen², Thomas Meier¹, Matthias Kronseder¹, Leonard Tutsch¹, Andreas Bauer³, Helmuth Berger⁴, Christian Pfleiderer³, Josef Zweck¹, Achim Rosch², and Christian Back¹ — ¹Institut für Experimentelle und Angewandte Physik, Universität Regensburg, Deutschland — ²Institut für Theoretische Physik, Universität zu Köln, Deutschland — ³Physik-Department, Technische Universität München, Deutschland — ⁴Crystal Growth Facility, École Polytechnique Fédérale de Lausanne, Schweiz

We report non-stroboscopic time resolved Lorentz-Transmission-Electron-Microscopy (LTEM) measurements of skyrmion lattice defects in the chiral magnet Cu₂OSeO₃. The multiferroic insulator hosts a hexagonal skyrmion lattice which can be observed in real space using LTEM. It is known, that the radial temperature profile caused by the illumination of the sample with the TEM electron beam sets the skyrmion lattice into rotation [1]. We utilize this effect to study the dynamics of defects and grain boundaries that naturally occur during the lattice rotation. The structural and dynamical behaviour of the defects is similar to that of 2D hexagonal particle lattices and therefore the particle character of the skyrmion in its lattice phase is stressed by our findings [2].

[1] Mochizuki, M. et al. Nat. mater. 13.3 (2014): 241-246

[2] Pöllath S, et al. PRL 118.20 (2017): 207205