First principles study of the adsorption of MgO molecules on a clean Fe(001) surface

TL;DR

This study uses density functional theory to analyze how MgO molecules adsorb on a Fe(001) surface, revealing preferred configurations, interface properties, and the impact on electronic and magnetic characteristics across different coverages.

Contribution

It provides detailed insights into the preferred adsorption geometries and the resulting electronic and magnetic properties of MgO on Fe(001), which were not previously characterized at this level.

Findings

Parallel adsorption with Mg in interstitial site is most favored.

Formation of a sharp, non-oxidized interface at certain configurations.

Magnetic moments decrease with increasing MgO coverage.

Abstract

The adsorption of MgO molecules on a Fe(001) surface was studied using density functional theory (DFT) and projector augmented wave methods. The energetically most favored configurations for different adsorption sites considered were identified. The most preferable adsorption geometry is when the MgO molecules are parallel to the surface, with Mg in the interstitial site and O in on-top of the Fe atom. During the adsorption of subsequent MgO molecules in this geometry, a sharp, non-oxidized interface is formed between the MgO adlayer and Fe(001) surface. The adsorption of MgO perpendicular to the surface, with oxygen incorporated in the topmost Fe layer is less probable, but may lead to the formation of the FeO layer when stabilized with an excess of oxygen atoms. Structural, electronic and magnetic properties of both interface types were examined for the MgO coverage from 1/9 to 1 monolayer (ML). Electronic and magnetic properties are sensitive to the MgO coverage. For lower coverage of MgO, clear hybridization between the Fe 3d and O 2p states is shown. The average magnetic moment of the surface Fe atoms is reduced with coverage, achieving 2.78 $\mu_{\rm B}$ for 1 ML of MgO.