Comparison of first-principles methods to extract magnetic parameters in ultra-thin films: Co/Pt(111)

Abstract

We compare three distinct computational approaches based on first-principles calculations within density functional theory to explore the magnetic exchange and the Dzyaloshinskii-Moriya interactions (DMI) of a Co monolayer on Pt(111), namely (i) the method of infinitesimal rotations of magnetic moments based on the Korringa-Kohn-Rostoker (KKR) Green function method, (ii) the generalized Bloch theorem applied to spiraling magnetic structures and (iii) supercell calculations with non-collinear magnetic moments, the latter two being based on the full-potential linearized augmented plane wave (FLAPW) method. In particular, we show that the magnetic interaction parameters entering micromagnetic models describing the long-wavelength deviations from the ferromagnetic state might be different from those calculated for fast rotating magnetic structures, as they are obtained by using (necessarily rather small) supercell or large spin-spiral wave-vectors. In the micromagnetic limit, which we motivate to use by an analysis of the Fourier components of the domain-wall profile, we obtain consistent results for the spin stiffness and DMI spiralization using methods (i) and (ii). The calculated spin stiffness and Curie temperature determined by subsequent Monte Carlo simulations are considerably higher than estimated from the bulk properties of Co, a consequence of a significantly increased nearest-neighbor exchange interaction in the Co-monolayer (+50%). The calculated results are carefully compared with the literature.

References in corpus (9)

• Advances in the Physics of Magnetic Skyrmions and Perspective for Technology
• Additive interfacial chiral interaction in multilayers for stabilization of small individual skyrmion at room temperature
• Magnetic skyrmion logic gates: conversion, duplication and merging of skyrmions
• Formation of magnetic skyrmions with tunable properties in PdFe bilayer deposited on Ir(111)
• Chirality in magnetic multilayers probed by the symmetry and the amplitude of dichroism in X-ray resonant magnetic scattering
• Temperature scaling of the Dzyaloshinsky-Moriya interaction in the spin wave spectrum
• Dzyaloshinskii-Moryia interaction at an antiferromagnetic interface: first-principles study of FeIr bilayers on Rh(001)
• Domain wall profiles in Co/Ir${}_n$/Pt(111) ultrathin films: influence of the Dzyaloshinskii-Moriya interaction
• Higher-dimensional Wannier interpolation for the modern theory of the Dzyaloshinskii-Moriya interaction: Application to Co-based trilayers

Cited by in corpus (6)

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• Type II multiferroic order in two-dimensional transition metal halides from first principles spin-spiral calculations
• Material systems for FM-/AFM-coupled skyrmions in Co/Pt-based multilayers
• First Principles Calculation of Dzyaloshinskii-Moriya Interaction: A Green's function Approach
• A DMI guide to magnets micro-world