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

Article

关键词: GENERALIZED GRADIENT APPROXIMATION;    EPITAXIAL FE FILMS;    AB-INITIO;    WORK FUNCTION;    IRON;    GROWTH;    ENERGIES;    RELAXATION;    MAGNETISM;    PRESSURE;   

DOI  :  10.1103/PhysRevB.92.155425

来源: SCIE

【 摘 要 】

The adsorption of MgO molecules on a Fe(001) surface was studied using density functional theory 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 the on-top site of the Fe atom. During the adsorption of subsequent MgO molecules in this geometry, a sharp, nonoxidized interface is formed between the MgO adlayer and the Fe(001) surface. The adsorption of MgO perpendicular to the surface, with oxygen incorporated in the topmost Fe layer, is less probable, but it 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(B) for 1 ML of MgO.

【 授权许可】

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