Regensburg 2022 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 19: Poster 1

MA 19.7: Poster

Dienstag, 6. September 2022, 17:30–20:00, P2

Interplay of moderate magnetocrystalline anisotropies and skyrmion lattice order in Fe_1−xCo_xSi — •Denis Mettus¹, Grace Causer¹, Alfonso Chacon¹, Andreas Bauer¹, Christian Franz¹, Anna Sokolova², Sebastian Mühlbauer³, and Christian Pfleiderer¹ — ¹Physik-Department, Technische Universität München, D-85748 Garching, Germany — ²Australian Nuclear Science and Technology Organisation (ANSTO), Lucas Heights NSW 2234, Australia — ³Heinz Maier-Leibnitz Zentrum (MLZ), Technische Universität München, Garching, Germany

Cubic chiral magnets exhibit a universal magnetic phase diagram due to a hierarchy of energy scales comprising exchange interactions, Dzyaloshinsky-Moriya spin-orbit coupling and magnetocrystalline anisotropies (MCAs). In MnSi thermal Gaussian fluctuations stabilize a skyrmion lattice phase near T_c for all magnetic field orientations reflecting very weak MCAs [1,2]. In Cu₂OSeO₃, an additional skyrmion lattice phase stabilizes in the low temperature limit due to strong MCAs for magnetic field parallel ⟨100⟩ [3]. We report a study of the interplay of moderate MCAs and disorder in Fe_1−xCo_xSi. Combining magnetometry and small-angle neutron scattering we observe a wide parameter range in which the effects of thermal fluctuations, MCAs and disorder stabilize skyrmion lattice order over an exceptionally wide parameter range depending on field orientation.

[1] S. Mühlbauer et al., Science 323 915 (2009); [2] T. Adams et al., Phys. Rev. Lett. 121 187205 (2018); [3] A. Chacon et al., Nat. Phys. 14 936 (2018).