Electronic structure of Graphene/Co interfaces

Abstract

Photoemission, from core levels and valence band, and low-energy electron diffraction (LEED) have been employed to investigate the electronic and structural properties of novel graphene-ferromagnetic (G-FM) systems,obtained by intercalation of one mono-layer (1ML) and several layers (4ML) of Co on G grown on Ir(111). Upon intercalation of 1ML of Co, the Co lattice is resized to match the Ir-Ir lattice parameter, resulting in a mismatched G/Co/Ir(111) system. The intercalation of further Co layers leads to a relaxation of the Co lattice and a progressive formation of a commensurate G layer lying on top. We show the C 1s line shape and the band structure of G in the two artificial phases, mismatched and commensurate G/Co, through a comparison with the electronic structure of G grown directly on a Co thick film. Our results show that while the G valence band mainly reflects the hybridization with the d states of Co, regardless of the structural phase, the C 1s line shape is very sensitive to the rumpling of the G layer and the coordination of carbon atoms with the underlying Co. Even in the commensurate (1x1) G/Co phase, where graphene is in register with the Co film, from the angular dependence of the C 1s core level we infer the presence of a double component, due to in-equivalent adsorption sites of carbon sub-lattices.

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• Ferromagnetic and Antiferromagnetic Coupling of Spin Molecular Interfaces with High Thermal Stability
• FePc Adsorption on the Moiré Superstructure of Graphene Intercalated with a Co Layer
• Narrowing of d bands of FeCo layers intercalated under graphene
• Graphene as a Mechanically Active, Deformable Two-Dimensional Surfactant
• Spin-dependent $\pi$${\pi }^{\ast }$ gap in graphene on a magnetic substrate
• Magnetic response and electronic states of well defined Graphene/Fe/Ir(111) heterostructure
• Confined step-flow growth of Cu intercalated between graphene and a Ru(0001) surface
• Elastic properties of moiré lattices in epitaxial two-dimensional materials
• Magnetic decoupling of ferromagnetic metals through a graphene spacer
• Graphene decoupling through oxygen intercalation on Gr/Co and Gr/Co/Ir interfaces