Dresden 2020 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 18: Skyrmions (joint session TT/MA)

TT 18.7: Talk

Monday, March 16, 2020, 17:45–18:00, HSZ 304

Helix reorientation at the transition between helical and conical phases of the chiral magnet Cu₂OSeO₃ — •Laura Köhler^1,4, Peter Milde¹, Erik Neuber¹, Philipp Ritzinger¹, Andreas Bauer², Christian Pfleiderer², Helmuth Berger³, and Markus Garst⁴ — ¹Technische Universität Dresden, 01062 Dresden, Germany — ²Technische Universität München, 85748 Garching, Germany — ³École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland — ⁴Karlsruher Institut für Technologie, 76131 Karlsruhe, Germany

In chiral magnets, the Dzyaloshinskii-Moriya interaction stabilizes a magnetic helix which is a one-dimensional periodic magnetic texture. The exact orientation of this helical texture is determined by the competition between crystalline anisotropies and the applied magnetic field. We study the reorientation process of the helix as a function of field in the insulating chiral magnet Cu₂OSeO₃ using magnetic force microscopy. As a function of field, we determine the wavelength projected onto the sample surface as well as the electric polarization induced by the magnetoelectric coupling. Our experimental observations are well described by an effective Landau theory for the helix orientation as previously applied to MnSi [1].

[1] A. Bauer, A. Chacon, M. Wagner, M. Halder, R. Georgii, A. Rosch, C. Pfleiderer, M. Garst, PR B 95, 024429 (2017).