Dresden 2020 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 17: Skyrmions (jointly with MA, O) (joint session TT/MA)

MA 17.7: Vortrag

Montag, 16. März 2020, 17:45–18:00, HSZ 304

Helix reorientation at the transition between helical and conical phases of the chiral magnet Cu2OSeO3 — •Laura Köhler1,4, Peter Milde1, Erik Neuber1, Philipp Ritzinger1, Andreas Bauer2, Christian Pfleiderer2, Helmuth Berger3, and Markus Garst41Technische 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).

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