[Zurück]

E. Davoli, G. Di Fratta, D. Praetorius, M. Ruggeri:
"Micromagnetics of thin films in the presence of Dzyaloshinskii-Moriya interaction";
in: "ASC Report 28/2020", herausgegeben von: Institute for Analysis and Scientific Computing; Vienna University of Technology, Wien, 2020, ISBN: 978-3-902627-13-1, S. 1 - 24.

In this paper, we study the thin-film limit of the micromagnetic energy functional in the presence of bulk Dzyaloshinskii-Moriya interaction (DMI). Our analysis includes both a stationary
Gamma-convergence result for the micromagnetic energy, as well as the identification of the asymptotic behavior of the associated Landau-Lifshitz-Gilbert equation. In particular, we prove that, in the limiting model, part of the DMI term behaves like the projection of the magnetic moment onto the normal to the film, contributing this way to an increase in the shape anisotropy arising from the magnetostatic self-energy. Finally, we discuss a convergent finite element
approach for the approximation of the time-dependent case and use it to numerically compare the original three-dimensional model with the two-dimensional thin-film limit.

Micromagnetics, Landau-Lifshitz-Gilbert Equation, Magnetic thin films, Dzyaloshinskii-Moriya interaction, -Convergence, Finite elements.

http://www.asc.tuwien.ac.at/preprint/2020/asc28x2020.pdf