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MA: Fachverband Magnetismus
MA 29: Skyrmions II
MA 29.6: Vortrag
Mittwoch, 19. März 2025, 16:15–16:30, H20
Cubic magnetic anisotropy in B20 magnets: Interplay of anisotropy and magnetic order in Fe1−xCoxSi — •Gilles Gödecke, Julius Grefe, Stefan Süllow, and Dirk Menzel — Insitut für Physik der Kondensierten Materie, TU Braunschweig, D-38106 Braunschweig, Germany
The itinerant systems MnSi and Fe1−xCoxSi are prominent members among the chiral B20 helimagnets. They are known to host chiral spin structures and magnetic skyrmions as a result from the competition of various magnetic interactions, one of which is magnetic anisotropy. Recently, a secondary skyrmion phase governed by cubic anisotropy was identified in the compound Cu2OSeO3 [1] raising the question wether such a phase also exists in MnSi and Fe1−xCoxSi. To aid the search for this phase, a better understanding of the cubic anisotropy in these systems would be beneficial.
Here, we report on the quantitative measurement of the cubic magnetocrystalline anisotropy constants in MnSi and Fe1−xCoxSi (0.08 ≤ x ≤ 0.70) single crystals. Our work presents a systematic study regarding the cubic anisotropy at T=5 K and T=10 K by means of angle-resolved SQUID magnetization measurements. We observe that the cubic anisotropy is generally weaker than in familiar compounds and more pronounced in MnSi than in Fe1−xCoxSi. For Fe1−xCoxSi the anisotropy gains at low Co-concentrations with increasing x, vanishes for x=0.50, and is then finite for high x.
[1] A. Chacon et al., Nature Physics 14, 936-941 (2018)
Keywords: magnetic anisotropy; chiral; itinerant