Magnetization of Epitaxial Graphene Induced by Magnetic Metallic Substrate

• Published in: Physics of the solid state Vol. 62; no. 2; pp. 378 - 383
• Main Author: Davydov, S. Yu
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01-02-2020; Springer; Springer Nature B.V
• Subjects: Antiferromagnetism; Coupling; Epitaxy; Ferromagnetism; Graphene; Graphenes; Graphite; Magnetic transitions; Magnetization; Mathematical analysis; Physics; Physics and Astronomy; Solid State Physics; Substrates; Transition metals; energy band diagram; induced magnetization; strong and weak graphene–substrate coupling
• ISSN: 1063-7834; 1090-6460
• DOI: 10.1134/S1063783420020080

A model of the energy diagram is proposed for graphene (Gr) monolayer formed on a magnetic transition metal (MTM). The regimes of the strong and weak Gr–MTM coupling are considered; the analytical expressions have been derived for the magnetization induced by a substrate in epitaxial graphene in these regimes. It is shown that, in the strong coupling regime, a quasi-local state gives the main contribution to the magnetization; in this case, the coupling has an antiferromagnetic character. In the weak coupling regime, the main contribution to the magnetization is given by states of the
d
band of MTM, which leads to the ferromagnetic character of the coupling. The numerical estimations are performed for the Gr/Ni(111) and Gr/Co(poly) and they are compared with the experimental data for Gr/Ni(111) and the calculated results for Cr/Co/Ni(111). In the first case, the results agree quantitatively and, in the second case, qualitatively.