  Experimental and theoretical studies of manganese deposition on
graphene/Ni(111) shows that a thin ferromagnetic Ni3Mn layer, which is
protected by the graphene overlayer, is formed upon Mn intercalation. The
electronic bands of graphene are affected by Ni3Mn interlayer formation through
a slight reduction of n-type doping compared to graphene/Ni(111) and a
suppression of the interface states characteristic of graphene/Ni(111). Our
DFT-based theoretical analysis of interface geometric, electronic, and magnetic
structure gives strong support to our interpretation of the experimental
scanning tunneling microscopy, low energy electron diffraction, and
photoemission results, and shows that the magnetic structure of graphene is
strongly influenced by Ni3Mn formation.
