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Initial stages of nickel oxide growth on Ag(001) by pulsed laser deposition

机译:脉冲激光沉积在Ag(001)上生长氧化镍的初始阶段

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摘要

Submonolayers of nickel oxide films were grown on an Ag(001) by pulsed laser deposition, and characterized in situ by both scanning tunneling microscopy and x-ray photoelectron spectroscopy. We observed quasi-two-dimensional growth of the film, and clearly identified several kinds of defects, such as embedded metallic Ni clusters and, notably, oxygen atoms, even while looking deeply into the substrate. These originated from Ni and O hyperthermal projectiles as well as from NiO clusters that were formed during laser ablation of a NiO target. Those defects played a role of nucleation sites in extending the nucleation stage of thin-film growth.
机译:氧化镍膜的亚单层通过脉冲激光沉积法在Ag(001)上生长,并通过扫描隧道显微镜和X射线光电子能谱进行原位表征。我们观察了薄膜的准二维生长,并清晰地发现了几种缺陷,例如,即使深深地注视基板,也嵌入了金属镍簇,尤其是氧原子。这些起因于Ni和O的高温弹丸以及NiO靶的激光烧蚀过程中形成的NiO团簇。这些缺陷在延长薄膜生长的成核阶段中起着成核位置的作用。

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