Co atoms on Bi2Se3 revealing a coverage dependent spin reorientation transition

被引：17
作者：
Eelbo, T. [1 ]
Sikora, M. [2 ]
Bihlmayer, G. [3 ,4 ,5 ]
Dobrzanski, M. [2 ]
Kozlowski, A. [2 ]
Miotkowski, I. [6 ]
Wiesendanger, R. [1 ]
机构：
[1] Univ Hamburg, Inst Appl Phys, D-20355 Hamburg, Germany
[2] AGH Univ Sci & Technol, Fac Phys & Appl Comp Sci, PL-30059 Krakow, Poland
[3] Forschungszentrum Julich, Peter Grunberg Inst, D-52428 Julich, Germany
[4] Forschungszentrum Julich, Inst Adv Simulat, D-52428 Julich, Germany
[5] JARA, D-52428 Julich, Germany
[6] Purdue Univ, Dept Phys, W Lafayette, IN 47907 USA
来源：
NEW JOURNAL OF PHYSICS | 2013年 / 15卷
关键词：
SURFACE; ANISOTROPY;
D O I：
10.1088/1367-2630/15/11/113026
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We investigate Co nanostructures on Bi2Se3 by means of scanning tunneling microscopy and spectroscopy (STM/STS), x-ray absorption spectroscopy, x-ray magnetic dichroism (XMCD) and calculations using the density functional theory (DFT). In the single adatom regime we find two different adsorption sites by STM. Our calculations reveal these to be the fcc and hcp hollow sites of the substrate. STS shows a pronounced peak for only one species of the Co adatoms indicating different electronic properties of both types. These are explained on the basis of our DFT calculations by different hybridizations with the substrate. Using XMCD we find a coverage dependent spin reorientation transition from easy-plane toward out-of-plane. We suggest clustering to be the predominant cause for this observation.
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页数：10
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