Angle-Resolved Photoemission Study of Electronic States in Ni(111) Surface with Oxygen Adsorption(Condensed matter : electronic structure and electrical, magnetic, and optical properties)

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We have investigated the surface electronic states of clean and oxygen-adsorbed Ni(111) surfaces by angle-resolved photoemission spectroscopy. Upon oxygen adsorption, c(2×2) and p(1×1) structures appear on 0.51 and 0.88 ML O/Ni(111) surfaces, respectively. By comparing the experimentally obtained energy dispersion of the surface electronic states with molecular-orbital and energy-band calculations, 3d_<xz>-2p_x and 3d_<yz>-2p_y antibonding π states are shown to be responsible for the electronic states at the interface and for the enhancement of the perpendicular magnetic anisotropy on oxygen-adsorbed Ni(111) surfaces.
社団法人日本物理学会の論文
2007-11-15