Abstract
Within the variational spin density functional method, the description of the temperature and ferromagnetic ordering effects on the adsorption of atoms of transition metals placed on paramagnetic substrates at formation of a monolayer film of FexNi1 – x alloy depending on the alloy component concentration and the coating parameter θ has been accomplished for the first time. The influence of different orientations of substrate surface planes is studied. The adsorption energy of a close-packed plane is minimal for all the systems presented. It is shown that a monolayer film without mixing is formed on the Au and W substrates at large values of the coating parameter and iron concentration, while silver atoms are forced out to the surface of the Ag substrate. The comparison of values of the adsorption energy calculated at θ = 1 and T = 0 K is carried out within the variational and the first-principles approaches. The calculation of magnetic moments and parameters of exchange interaction of the FexNi1 – x bulk alloy using the Korringa–Kohn–Rostoker method is accomplished at the equilibrium values of lattice constant obtained within the first-principles calculations. The exchange interaction is of a ferromagnetic nature, it increases with the increase in nickel concentration in the nearest polytypic neighbors \(J_{1}^{{{\text{Ni}} - {\text{Fe}}}}\) and decreases in the nearest equitype neighbors \(J_{1}^{{{\text{Ni}} - {\text{Ni}}}}\). The exchange interaction between the second neighbors occurs only in equitype atoms; it is of a ferromagnetic nature in iron atoms and is weakly antiferromagnetic in nickel atoms.
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Funding
The paper was supported by the Russian Foundation for Basic Research, project nos. 17-02-00279 and 18-42-550003, and the Grant of the President of Russian Federation MD-6868.2018.2. The computing resources of the Resource Sharing Center of the Far Eastern Branch, Russian Academy of Sciences (Khabarovsk), were used.
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Translated by N. Semenova
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Mamonova, M.V. Study of Energetic and Magnetic Properties of FexNi1 – x Monolayer Film on Nonmagnetic Metallic Substrates. Phys. Solid State 62, 777–784 (2020). https://doi.org/10.1134/S1063783420050170
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DOI: https://doi.org/10.1134/S1063783420050170