Domain wall profiles in Co/Ir${}_n$/Pt(111) ultrathin films: influence of the Dzyaloshinskii-Moriya interaction

Abstract

We perform a study of domain walls in Co/Ir${}_n$/Pt(111) (n = 0,1,...,6) films by a combined approach of first-principles calculations and spin dynamics simulations. We determine the tensorial exchange interactions and the magnetic anisotropies for the Co overlayer in both FCC and HCP geometries, depending on the number of Ir buffer layers. We find strong ferromagnetic nearest-neighbor isotropic exchange interactions between the Co atoms and an out-of-plane magnetic anisotropy for the films in FCC geometry. Our simulations show that the magnetic domain walls are of Néel type, and their rotational sense (chirality) is changed upon the insertion of an Ir buffer layer as compared to the pristine Co/Pt(111) system. Our spin dynamics simulations indicate a twisting of the spins with respect to the planar domain wall profile on the triangular lattice. We discuss this domain wall twisting using symmetry arguments and in terms of an appropriate micromagnetic continuum model considering extra energy terms compared to the available literature.

arXiv comment11 pages, 6 figures

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• Comparison of first-principles methods to extract magnetic parameters in ultra-thin films: Co/Pt(111)
• Magnetic structure of monatomic Fe chains on Re(0001): emergence of chiral multi-spin interactions
• Temperature scaling of the Dzyaloshinsky-Moriya interaction in the spin wave spectrum
• Magnetism of a Co monolayer on Pt(111) capped by overlayers of $5d$ elements: a spin-model study
• Domain walls and Dzyaloshinskii-Moriya interaction in epitaxial Co/Ir(111) and Pt/Co/Ir(111)
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• Damping in Ru/Co-based multilayer films with large Dzyaloshinskii-Moriya interaction