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Proximity-Induced Spin Polarization of Graphene in Contact with Half-Metallic Manganite
Seiji Sakai1,2,3, Sayani Majumdar4, Zakhar I Popov5
1Quantum Beam Science Research Directorate, National Institutes for Quantum and Radiological Science and Technology QST , 2-4 Shirakata, Tokai, Naka, Ibaraki 319-1106, Japan.
Abstract:
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 La0.7Sr0.3MnO3 (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 π band structure.
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