Structural, chemical and magnetic properties of secondary phases in Co-doped ZnO

被引：43
作者：
Ney, A. [1 ,2 ]
Kovacs, A. [3 ,5 ]
Ney, V. [1 ,2 ]
Ye, S. [1 ,2 ]
Ollefs, K. [1 ,2 ]
Kammermeier, T. [1 ,2 ]
Wilhelm, F. [4 ]
Rogalev, A. [4 ]
Dunin-Borkowski, R. E. [3 ,5 ]
机构：
[1] Univ Duisburg Essen, Fak Phys, D-47057 Duisburg, Germany
[2] Univ Duisburg Essen, CeNIDE, D-47057 Duisburg, Germany
[3] Tech Univ Denmark, Ctr Electron Nanoscopy, DK-2800 Lyngby, Denmark
[4] European Synchrotron Radiat Facil, F-38043 Grenoble, France
[5] Res Ctr Julich, Peter Grunberg Inst, Ernst Ruska Ctr Microscopy & Spect Electrons, D-52425 Julich, Germany
来源：
NEW JOURNAL OF PHYSICS | 2011年 / 13卷
基金：
欧洲研究理事会;
关键词：
FERROMAGNETISM; OXIDES; FILMS;
D O I：
10.1088/1367-2630/13/10/103001
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We have utilized a comprehensive set of experimental techniques such as transmission electron microscopy (TEM) and synchrotron-based x-ray absorption spectroscopy (XAS) and the respective x-ray linear dichroism and x-ray magnetic circular dichroism to characterize the correlation of structural, chemical and magnetic properties of Co-doped ZnO samples. It can be established on a quantitative basis that the superparamagnetic (SPM) behavior observed by integral superconducting quantum interference device magnetometry is not an intrinsic property of the material but stems from precipitations of metallic Co. Their presence is revealed by TEM as well as XAS. Annealing procedures for these SPM samples were also studied, and the observed changes in the magnetic properties found to be due to a chemical reduction or oxidation of the metallic Co species.
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页数：17
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