Magnetism of a Co monolayer on Pt(111) capped by overlayers of 5d elements: A spin-model study

Using first-principles calculations, we study the magnetic properties of a Co monolayer on a Pt(111) surface with a capping monolayer of selected 5d elements (Re, Os, Ir, Pt, and Au). First we determine the tensorial exchange interactions and magnetic anisotropies characterizing the Co monolayer for...

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Bibliographic Details
Published in:Physical review. B 2018-04, Vol.97 (13)
Main Authors: Simon, E, Rózsa, L, Palotás, K, Szunyogh, L
Format: Article
Language:English
Subjects:
Capping
Cobalt
Computer simulation
Exchanging
Ferromagnetism
First principles
Gold
Iridium
Magnetic anisotropy
Magnetic moments
Magnetic properties
Magnetism
Monolayers
Platinum
Spin dynamics
Spin-orbit interactions
Thin films
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Summary:Using first-principles calculations, we study the magnetic properties of a Co monolayer on a Pt(111) surface with a capping monolayer of selected 5d elements (Re, Os, Ir, Pt, and Au). First we determine the tensorial exchange interactions and magnetic anisotropies characterizing the Co monolayer for all considered systems. We find a close relationship between the magnetic moment of the Co atoms and the nearest-neighbor isotropic exchange interaction, which is attributed to the electronic hybridization between the Co and the capping layers, in the spirit of the Stoner picture of ferromagnetism. The Dzyaloshinskii-Moriya interaction is decreased for all overlayers compared to the uncapped Co/Pt(111) system, while even the sign of the Dzyaloshinskii-Moriya interaction changes in the case of the Ir overlayer. We conclude that the variation of the Dzyaloshinskii-Moriya interaction is well correlated with the change of the magnetic anisotropy energy and of the orbital moment anisotropy. The unique influence of the Ir overlayer on the Dzyaloshinskii-Moriya interaction is traced by scaling the strength of the spin-orbit coupling of the Ir atoms in Ir/Co/Pt(111) and by changing the Ir concentration in the Au1−xIrx/Co/Pt(111) system. Our spin dynamics simulations indicate that the magnetic ground state of Re/Co/Pt(111) thin film is a spin spiral with a tilted normal vector, while the other systems are ferromagnetic.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.97.134405