Proximity-Induced Spin Polarization of Graphene in Contact with Half-Metallic Manganite

: Sakai S, Majumdar S, Popov ZI, Avramov PV, Entani S, Hasegawa Y, Yamada Y, Huhtinen H, Naramoto H, Sorokin PB, Yamauchi Y

Publisher: AMER CHEMICAL SOC

: 2016

: ACS Nano

: ACS NANO

: 10

: 8

: 7532

: 7541

: 10

: 1936-0851

DOI: https://doi.org/10.1021/acsnano.6b02424

The role of proximity contact with magnetic oxides is of particular interest from the expectations of the induced spin polarization and weak interactions at the graphene/magnetic oxide interfaces, which would allow us to achieve efficient spin-polarized injection in graphene-based spintronic devices. A combined approach of topmost-surface sensitive spectroscopy utilizing spin-polarized metastable He atoms and ab initio calculations provides us direct evidence for the magnetic proximity effect in the junctions of single-layer graphene and half-metallic manganite Lac(0.7)Sr(0.3)MnO(3) (LSMO). It is successfully demonstrated that in the graphene/LSMO junctions a sizable spin polarization is induced at the Fermi level of graphene in parallel to the spin polarization direction of LSMO without giving rise to a significant modification in the pi band structure.