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Berlin 2012 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 38: Correlated Electrons: Spin Systems and Itinerant Magnets 1

TT 38.11: Talk

Thursday, March 29, 2012, 12:30–12:45, H 3010

Relevance of magnetic anisotropies for the skyrmion lattice in MnSi — •Tim Adams1, Andreas Bauer1, Marco Halder1, Robert Georgii1,2, and Christian Pfleiderer11Technische Universität München, Physik-Department E21, D-85748 Garching, Germany — 2Forschungs-Neutronenquelle Heinz Maier-Leibnitz (FRM II), D-85748 Garching, Germany

We used high-precision small angle neutron scattering and magnetisation measurements to determine the strength of the magnetic anisotropies in MnSi. To minimise the effects of uncontrolled demagnetising fields a spherical sample was studied. The strength of the leading order quartic anisotropy terms, which by symmetry arguments cannot couple to the skyrmion lattice, are thereby inferred from variations of the transition field to the conical state. This is followed by anisotropy terms beyond fourth order, which are inferred from the orientation of the skyrmion lattice in the plane perpendicular to the applied field and tiny systematic tilts out of this plane. Taken together our data allows us to discuss the relevance of magnetic anisotropies for the morphology and stabilityof the skyrmion lattice in bulk samples of MnSi and related systems.

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