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MA: Fachverband Magnetismus
MA 34: Magnetic textures: Transport and dynamics II
MA 34.7: Vortrag
Mittwoch, 3. April 2019, 16:45–17:00, H37
Role of damping and continuity in the stability of skyrmions and antiskyrmions — •Martin Stier1, Wolfgang Häusler2, and Michael Thorwart1 — 1Universität Hamburg, Jungiusstr. 9, 20355 Hamburg — 2Universität Augsburg, Universitätsstr. 1, 86135 Augsburg
Magnetic skyrmions are magnetic vortices with non-vanishing topological charge Q. This topological charge can not be changed by means of a continuous transformation of the magnetic texture n(x,y,t). This topologically protects skyrmions as well as antiskyrmions and the transition to topologically different phases is forbidden. On lattices, however, this topological protection does not hold in a strict sense and skyrmions can be created or destroyed as it is confirmed by experiment and theory. Nevertheless, on discrete lattices the topological protection is still taken as a justification for the comparably strong stability of skyrmions even without a strict theoretical support. To establish ties between the discrete and continuous limit we study the decay of skyrmions and antiskyrmions. By increasing the number lattice sites we approach the continuous limit. We discuss the according decay times with a distinct focus on the role of the damping on the decay.