Scanning tunneling microscopy study of Fe, Co and Cr growth on Re(0001)

被引：24
作者：
Ouazi, S. [1 ]
Pohlmann, T. [1 ]
Kubetzka, A. [1 ]
von Bergmann, K. [1 ]
Wiesendanger, R. [1 ]
机构：
[1] Univ Hamburg, Dept Phys, D-20355 Hamburg, Germany
来源：
SURFACE SCIENCE | 2014年 / 630卷
关键词：
3d elements growth; Standing waves; Magnetic Neel ordered state; STRAIN RELAXATION; SINGLE-ATOM; SURFACE; NANOSCALE; RHENIUM; SULFUR;
D O I：
10.1016/j.susc.2014.08.026
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
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.
引用
收藏
页码：280 / 285
页数：6
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