Growth of ultrathin films of Fe on Au{001}
Growth of ultrathin films of Fe on Au{001}
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Au 上 Fe 超薄膜的生长{001}
DOI：
10.1103/physrevb.48.1779
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发表时间：
1993
期刊：
影响因子：
--
通讯作者：
Marcus
中科院分区：
文献类型：
--
作者：
Begley;Kim;Quinn;Jona;Over;Marcus
用定量低能电子衍射(LEED)和俄歇电子能谱(AES)研究了Fe超薄膜在Au[L支架]001[r支架]上生长的结晶学问题。发现第一层Fe是层间距为1.825 A的Au[L支撑]001[r支撑]衬底的假象，并在层间距为1.85A时被一层Au单层覆盖，起到了表面活性剂的作用。较厚的Fe薄膜[高达45层当量(LE)]可能是假象的，因此可能是轻微应变(晶格失配为0.6%)或具有表面弛豫的平衡体心立方(本分析无法区分这两种可能性)，但包含缺陷和无序台阶。发现金原子在45-Le-Fe薄膜的表面区偏聚，但大多呈无序排列。用两种不同的计算机程序计算LEED强度的结果之间的比较发现，结构参数值可能会出现0.025埃的差异。
The crystallographic aspects of the growth of ultrathin films of Fe on Au[l brace]001[r brace] are studied by means of quantitative low-energy electron diffraction (LEED) and Auger electron spectroscopy (AES). The first monolayer of Fe is found to be pseudomorphic to the Au[l brace]001[r brace] substrate with an interlayer spacing of 1.825 A, and to be covered by a monolayer of Au at an interlayer distance of 1.85 A, which acts as a surfactant. Thicker films of Fe [up to 45 layer equivalents (LE)] may be pseudomorphic and hence slightly strained (the lattice misfit is 0.6%) or equilibrium bcc with surface relaxation (the present analysis cannot distinguish between the two possibilities), but contain defects and disordered steps. Gold atoms are found to be segregated in the surface region of 45-LE Fe films, but mostly in a disordered arrangement. A comparison between the results obtained with two different computer programs for the calculation of LEED intensities finds that differences of 0.025 A in the values of structural parameters may occur.