Berlin 2012 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 14: Matter At Low Temperature: Multiferroics (jointly with MA, DF, DS, KR

TT 14.3: Talk

Monday, March 26, 2012, 17:30–17:45, H 3005

Vortex domain walls in helical magnets — •Thomas Nattermann¹, Fuxian Li², and Valery L. Pokrovsky^2,3 — ¹Institut für Theoretische Physik, Universität zu Köln, D-50937 Köln, Germany — ²Department of Physics, Texas A&M University, College Station, Texas 77843-4242 — ³Landau Institute for Theoretical Physics, Chernogolovka, Moscow District, 142432, Russia

The theory of domain walls in both centrosymmetric and non-centrosymmetric helical magnets is presented. With the exception of discrete orientations domain walls consist of an array of parallel vortex lines, their width is only weakly depending anisotropy, in contrast to ferromagnets and antiferromagnets. In conical phases vortex walls carry Berry phase flux which gives rise to an anomalous Hall effect. In multi-ferroics vortices are electrically charged.