Veranstaltungsdetails

8.6.2006, 15:30
Jungiusstr. 11, Hörsaal AP

SFB 668 - Kolloquium

Dr. Ulrich K. Rößler (IFW Dresden):

Localized and modulated states in chiral magnets

In certain non-linear field models particle-like localized states, so-called Skyrmions, can be stabilized. The talk presents new theoretical results on Skyrmionic magnetization structures in magnets with broken inversion symmetry. In these chiral systems, the Dzyaloshinskii-Moriya exchange interactions stabilize vortex-like Skyrmions as string-like excitations. Condensates of Skyrmions may form of multiply extended modulated states. In phenomenological models for weakly ferromagnetic metals, Skyrmion lattices spontaneously arise as equilibrium phases. The theory can explain the ´partial magnetic order´ recently found in the chiral ferromagnet MnSi. Magnetic Skyrmion lattices are predicted to exist quite generally in magnetic metal films owing to the broken inversion symmetry at surfaces.