Regensburg 2022 – wissenschaftliches Programm
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 23: Skyrmions 2 (joint session MA/KFM)
KFM 23.7: Vortrag
Donnerstag, 8. September 2022, 11:00–11:15, H37
Tunable ellipticity of Bloch skyrmions in antiskyrmion-hosting materials — Sebastian Schneider1,2, •Jan Masell1,3, Fehmi S. Yasin1, Licong Peng1, Kosuke Karube1, Yasujiro Taguchi1, Darius Pohl2, Bernd Rellinghaus2, Yoshinori Tokura1,4, and Xiuzhen Yu1 — 1RIKEN CEMS, Wako, Japan — 2TU Dresden, Dresden, Germany — 3Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany — 4University of Tokyo, Tokyo, Japan
Magnetic skyrmions are usually stabilized and studied in materials with isotropic Dzyaloshinskii-Moriya interaction (DMI). In materials with D2d or S4 symmetry, however, the sign of the DMI is exactly opposite in two orthogonal directions such that it favors antiskyrmions instead of skyrmions. [1,2] Yet, uniaxial anisotropy and dipolar interactions can also help stabilizing skyrmions in such materials which, as a consequence of the anisotropic DMI, are rendered elliptical. We quantify the elliptical distortion of skyrmions in an S4 symmetric material as function of magnetic field and temperature using LTEM holography. Our micromagnetic simulations and simple analytical modelling explain the experimentally observed behavior and provide a technique to quantitatively estimate the DMI.
[1] K. Karube, L. C. Peng, J. Masell, X. Z. Yu, F. Kagawa, Y. Tokura, and Y. Taguchi, Nat. Mater. 20, 335-340 (2021) [2] K. Karube, L. C. Peng, J. Masell, M. Hemmida, H.-A. Krug von Nidda, I. Kézsmárki, X. Z. Yu, Y. Tokura, and Y. Taguchi, Adv. Mater. 34 (11), 2108770 (2022) [3] In preparation.