Calculus of Variations and Geometric Measure Theory

E. Davoli - G. Di Fratta - D. Praetorius - M. Ruggeri

Micromagnetics of thin films in the presence of Dzyaloshinskii-Moriya interaction

created by davoli on 29 Oct 2020
modified by difratta on 14 Jun 2023


Published Paper

Inserted: 29 oct 2020
Last Updated: 14 jun 2023

Journal: Mathematical Models and Methods in Applied Sciences
Year: 2020


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 Γ-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.