Quantum Beam Science Research Directorate, National Institutes for Quantum and Radiological Science and Technology QST , 2-4 Shirakata, Tokai, Naka, Ibaraki 319-1106, Japan.
National Institute for Materials Science , Tsukuba, Ibaraki 305-0047, Japan.
ACS Nano. 2016 Aug 23;10(8):7532-41. doi: 10.1021/acsnano.6b02424. Epub 2016 Jul 20.
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.
与磁性氧化物近距离接触的作用特别有趣，因为它可以在石墨烯/磁性氧化物界面上产生诱导自旋极化和弱相互作用，这将使我们能够在基于石墨烯的自旋电子器件中实现有效的自旋极化注入。利用自旋极化亚稳态氦原子的最表面敏感光谱和从头算计算的组合方法，为单层石墨烯和半金属锰酸盐 La0.7Sr0.3MnO3 (LSMO) 的结中的磁近邻效应提供了直接证据。成功地证明了在石墨烯/LSMO 结中，在与 LSMO 的自旋极化方向平行的石墨烯费米能级中诱导出相当大的自旋极化，而不会对π 带结构产生显著的改变。
