Scanning tunneling microscopy study of Fe, Co and Cr growth on Re(0001)
Scanning tunneling microscopy study of Fe, Co and Cr growth on Re(0001)
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DOI：
10.1016/j.susc.2014.08.026
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发表时间：
2014-12-01
期刊：
影响因子：
1.9
通讯作者：
Wiesendanger, R.
中科院分区：
文献类型：
--
作者：
Ouazi, S.;Pohlmann, T.;Wiesendanger, R.
通过氧退火，然后闪蒸至更高温度，获得了污染物密度低于0.5%的Re（0001）表面的原子平坦梯田。该Re（0001）单晶已被用作沉积Fe、Co和Cr原子的衬底。扫描隧道显微镜实验表征了亚单层覆盖体系的生长模式。Co， Cr和Fe原子自组装形成单层高岛。尽管薄膜和衬底之间有很大的晶格不匹配，但Co和Fe的假晶生长高达半单层。铬岛只有在小于10纳米的尺寸下才是假晶的。盖度越高，重建的岛屿具有依赖要素的重建模式。在8k下的扫描隧道光谱测量揭示了Fe和Re的电子特性。对Re（0001）的差分电导测量显示了驻波的存在，可能是由于铼的表面状态。铁原子附着在Re阶边的原子分辨率图像表明，铁原子占据了hcp空位。利用自旋极化扫描隧道显微镜和磁原子操纵成像技术揭示了铁hcp单层的尼尔磁有序态。(C) 2014 Elsevier B.V.版权所有
Atomically flat terraces of the Re(0001) surface with a contaminant density below 0.5% have been obtained by oxygen annealing followed by a flash to higher temperature. This Re(0001) single crystal has been used as a substrate for the deposition of Fe, Co and Cr atoms. Scanning Tunneling Microscopy experiments characterize the growth mode for the submonolayer coverage regime. Co, Cr and Fe atoms self-assemble to form monolayer high islands. Despite a large lattice mismatch between film and substrate, Co and Fe grow pseudomorphically up to half a monolayer. Cr islands are pseudomorphic only for a size below 10 nm. Higher coverage leads to reconstructed islands with an element-dependent reconstruction pattern. Scanning Tunneling Spectroscopy measurements at 8 K reveal the electronic properties of Fe and Re. Differential conductance measurements on the Re(0001) show the presence of standing waves, possibly due to a rhenium surface state. Atomic resolution images of Fe attached to a Re step edge lead to the conclusion that the Fe atoms occupy hcp hollow sites. A Neel magnetic ordered state of the Fe hcp monolayer is revealed with Spin-Polarized Scanning Tunneling Microscopy and Magnetic Atom Manipulation Imaging. (C) 2014 Elsevier B.V. All rights reserved.