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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 Back11Institut 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

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