Magnetic and electronic characterization of highly Co-doped ZnO: An annealing study at the solubility limit

被引：26
作者：
Knut, R. [1 ]
Wikberg, J. M. [2 ]
Lashgari, K. [3 ]
Coleman, V. A. [3 ]
Westin, G. [3 ]
Svedlindh, P. [2 ]
Karis, O. [1 ]
机构：
[1] Uppsala Univ, Dept Phys, SE-75121 Uppsala, Sweden
[2] Uppsala Univ, Dept Engn Sci, SE-75121 Uppsala, Sweden
[3] Uppsala Univ, Dept Chem Mat, SE-75121 Uppsala, Sweden
来源：
PHYSICAL REVIEW B | 2010年 / 82卷 / 09期
基金：
瑞典研究理事会;
关键词：
COBALT OXIDE; THIN-FILMS; CO3O4; SEMICONDUCTORS; FERROMAGNETISM; TEMPERATURE; COMPLEXES; COO(100); GROWTH; METAL;
D O I：
10.1103/PhysRevB.82.094438
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We report on investigations of the electronic structure and magnetic properties of ZnO doped with 15 at. % Co and postgrowth annealed at temperatures ranging between 250 and 800 degrees C. In particular, we demonstrate how the presence of Co(3+), indicative of secondary phases, is manifested in spectroscopy. Through resonant photoemmision spectroscopy we have found that x-ray diffraction in some cases underestimates or does not reveal the presence of secondary phases, possibly due to unrelaxed structures or structural arrangements with sizes below the detection limit. The magnetic properties are in most cases understood by assuming small antiferromagnetic clusters but can also show a behavior indicative of ferromagnetic interactions.
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页数：7
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