Berlin 2012 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 38: Correlated Electrons: Spin Systems and Itinerant Magnets 1
TT 38.11: Vortrag
Donnerstag, 29. März 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 Pfleiderer1 — 1Technische 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.