Heteroepitaxial growth of Co on W(110) investigated by scanning tunneling microscopy
Heteroepitaxial growth of Co on W(110) investigated by scanning tunneling microscopy
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通过扫描隧道显微镜研究 Co 在 W(110) 上的异质外延生长
DOI：
10.1103/physrevb.67.153405
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发表时间：
2003
影响因子：
3.7
通讯作者：
M. Getzlaff
中科院分区：
文献类型：
--
作者：
M. Pratzer;H. Elmers;M. Getzlaff
用扫描隧道显微镜研究了Co亚单层在体心立方W（110）表面的生长。由于Co-W的强键合，Co的单层膜在W（110）上以赝晶的方式平衡生长，直到单层膜几乎完全形成。当多余的原子沉积在假晶单层的顶部时，它转变为具有平行于$[11\ifmmode\bar\else\textasciimacron\fi{}0]$（Nishiyama-Wassermann取向）的错配位错线的密堆积（cp）单层。从原子分辨STM图像得出的cp单层的结构偏离了cp（111）层的刚性硬球模型。详细的结构进行了比较，以前提出的结构模型由货车der Merwe等人。嵌入原子模型（EAM）的基础上。
We investigated the growth of Co submonolayers on bcc W(110) by scanning tunneling microscopy. Due to the strong Co-W bonding, monolayers of Co grow in equilibrium pseudomorphically on W(110) until the monolayer is almost completed. When excess atoms are deposited atop the pseudomorphic monolayer, it transforms to a close-packed (cp) monolayer with misfit dislocation lines parallel to $[11\ifmmode\bar\else\textasciimacron\fi{}0]$ (Nishiyama-Wassermann orientation). The structure of the cp monolayer, as concluded from atomically resolved STM images, deviates from the rigid hard-sphere model of a cp (111) layer. Details of the structure are compared to a structure model previously proposed by van der Merwe et al. based on the embedded atom model (EAM).