Dresden 2017 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MA: Fachverband Magnetismus
MA 64: Poster 1
MA 64.40: Poster
Freitag, 24. März 2017, 09:30–13:00, P2-EG
Demagnetisation energy and magnetisation variation effects on the isolated skyrmion dynamics — •Marijan Beg1, David I. Cortés-Ortuño1, Weiwei Wang1,2, Rebecca Carey1, Mark Vousden1, Ondrej Hovorka1, and Hans Fangohr1 — 1Faculty of Engineering and the Environment, University of Southampton, Southampton, SO17 1BJ, United Kingdom — 2Department of Physics, Ningbo University, Ningbo, 315211, China
Usually for simplicity, in the simulations of skyrmionic states in helimagnetic samples, the demagnetisation energy is neglected and/or thin film samples are modelled using two-dimensional meshes. In this work, we investigate how these two assumptions affect the dynamics of an isolated skyrmion state in a 150 nm diameter FeGe disk. Firstly, we simulate the isolated skyrmion state dynamics using a full three-dimensional model. Secondly, we repeat the simulation under the same conditions, but this time we set the demagnetisation energy artificially to zero. Finally, we use a 2D mesh to model a thin film sample. We compare the power spectral densities and observe that although the magnetisation dynamics associated to the identified eigenmodes do not change significantly, their frequencies change substantially. We conclude that neglecting the demagnetisation energy contribution or modelling 3D samples using two-dimensional meshes in skyrmionic state dynamics simulations is not always justified. This work was supported by the EPSRC’s EP/G03690X/1 and EP/N032128/1 grants and the Horizon 2020 European Research Infrastructure project (676541).