Regensburg 2013 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 28: Correlated Electrons: Spin Systems, Itinerant Magnets 3

TT 28.6: Talk

Tuesday, March 12, 2013, 10:45–11:00, H19

From Skyrmions to Helices: Changing the Topology in Chiral Magnets — •Stefan Buhrandt and Achim Rosch — Universität Köln

In chiral magnets, a small magnetic field stabilizes a lattice of magnetic whirls, so called skyrmions. They are characterized by a topologically quantized winding number. Using classical Monte Carlso simulations, we investigate the first order phase transition from the skyrmion phase to a helical phase when the magnetic field is reduced. As the topology of the magnetic texture changes, the phase transition is driven by singular magnetic configuration, which we identify as hedgehog point defect. These hedgehogs are responsible for the merging of skyrmions and changes of the winding number.