Regensburg 2022 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 23: Skyrmions 2 (joint session MA/KFM)

KFM 23.11: Vortrag

Donnerstag, 8. September 2022, 12:00–12:15, H37

Magnetocrystalline anisotropy in cubic chiral magnets — •Vivek Kumar¹, Andreas Bauer¹, Schorsch Michael Sauther¹, Michelle Hollricher¹, Markus Garst², Marc Andreas Wilde¹, and Christian Pfleiderer¹ — ¹Physik-Department, Technische Universität München, D-85748 Garching, Germany — ²Institut für Theoretische Festkörperphysik, Karlsruhe Institute of Technology, D-76131 Karlsruhe, Germany

Magnetocrystalline anisotropy plays an important role in the stabilization, orientation and manipulation of exotic spin textures like skyrmions in cubic chiral magnets [1-3]. Here, we report the determination of the fourth and sixth order anisotropy constants of MnSi as a function of temperature and field using the cantilever torque magnetometry option in a physical property measurement system. Torque curves were recorded by rotating the single-crystalline spherical sample in the field polarized state. This allows us to extract anisotropy constants by fitting the experimental data to the theoretical expressions of torques belonging to the symmetry class (P2₁3). In addition, we discuss technical issues in measurement related to sample shape and geometry. The present technique is used to obtain the anisotropy constants of other cubic chiral magnets including Cu₂OSeO₃, Mn_1−xFe_xSi and Fe_1−xCo_xSi series.
[1] Chacon et al., Nat. Phys. 14, 936 (2018).
[2] Bauer et al., Phys. Rev. B 95, 024429 (2017).
[3] Adams et al., Phys. Rev. Lett. 121, 187205 (2018).