NEXAFS and XMCD studies of single-phase Co-doped ZnO thin films

Title
NEXAFS and XMCD studies of single-phase Co-doped ZnO thin films
Authors
A. P. SinghRavi kumarP. ThakurN. B. Brookes채근화최원국
Keywords
ZnO; NEXAFS; XMCD
Issue Date
2009-02
Publisher
Journal of physics, Condensed matter : an Institute of Physics journal
Citation
VOL 21, 185005-1-185005-7
Abstract
A study of the electronic structure and magnetic properties of Co doped ZnO thin films synthesized by ion implantation followed by swift heavy ion irradiation is presented using near-edge x-ray absorption fine structure (NEXAFS) and x-ray magnetic circular dichroism (XMCD) measurements. The spectral features of NEXAFS at the Co L3,2-edge show entirely different features than that of metallic Co clusters and other Co oxide phases. The atomic multiplet calculations are performed to determine the valence state, symmetry and the crystal field splitting, which show that in the present system Co is in the 2+ state and substituted at the Zn site in tetrahedral symmetry with 10Dq = −0.6 eV. The ferromagnetic character of these materials is confirmed through XMCD spectra. To rule out the possibilities of defect induced magnetism, the results are compared with Ar annealed and Ar-ion implanted pure ZnO thin films. The presented results confirm the substitution of Co at the Zn site in the ZnO matrix, which is responsible for room temperature ferromagnetism.
URI
http://pubs.kist.re.kr/handle/201004/35028
ISSN
0953-8984
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KIST Publication > Article
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