Berlin 2015 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 20: POSTER Ib

MA 20.46: Poster

Dienstag, 17. März 2015, 09:30–13:00, Poster A

Dipole-Dipole Interactions in Skyrmionic Systems — •Lukas Heinen and Achim Rosch — Institut für theoretische Physik, Universität zu Köln, Deutschland

Chiral magnets exhibit vortex-like excitations of the magnetic structure, so-called skyrmions. These excitations carry an integer winding number and hence are stabilized by topological protection. Furthermore they can be manipulated with ultra-low current densities. Therefore skyrmions are a promising candidate for the development of spintronic devices.

Skyrmions in chiral magnets are mainly driven by Dzyaloshinksii-Moriya (DM) interactions. In typical skyrmion materials, like MnSi, dipole-dipole interactions are nominally of similar magnitude as DM interactions. However, they influence static skyrmion properties only weakly, due to the specific form of the magnetic structure of skyrmions. We study how the inclusion of the full dipole-dipole interactions changes the dynamical properties of skyrmions. Using micro-magnetic simulations of thin films, we compute the change in the phase diagram, the effective skyrmion-defect-interaction potential, and the excitation spectrum.