Back to Search
Start Over
The influence of carbon concentration on the electronic structure and magnetic properties of carbon implanted ZnO thin films.
- Source :
-
Physical chemistry chemical physics : PCCP [Phys Chem Chem Phys] 2017 May 24; Vol. 19 (20), pp. 13316-13323. - Publication Year :
- 2017
-
Abstract
- The influence of carbon concentration on the electronic and magnetic properties of C-implanted ZnO thin films has been studied using synchrotron radiation based X-ray absorption spectroscopic techniques and vibrating sample magnetometer measurements. 20 keV carbon ions were implanted in ZnO films with different fluences (2 × 10 <superscript>16</superscript> , 4 × 10 <superscript>16</superscript> and 6 × 10 <superscript>16</superscript> ions per cm <superscript>2</superscript> ). The pristine ZnO film shows diamagnetic behaviour while the C-implanted films exhibit room temperature ferromagnetism. Our first-principles calculations based on density functional theory show an appreciable magnetic moment only when the implanted C atom sits either in the O-site (2 μ <subscript>B</subscript> ) or in the interstitial position (1.88 μ <subscript>B</subscript> ), whereas the C atom in the Zn substitutional position does not possess any magnetic moment. X-ray absorption near edge structure analysis at the O K-edge reveals that the charge transfer from O-2p to the C-defect site causes the ferromagnetism in the C-implanted ZnO film at low fluence. However at high fluence, the implanted C replaces the lattice and produces more Zn vacancies, as evidenced by extended X-ray absorption fine structure studies at the Zn K-edge, which favors the ferromagnetism. The persistence of the implanted carbon and ferromagnetism of the C-implanted ZnO film has also been studied by isothermal annealing at 500 °C and discussed in detail.
Details
- Language :
- English
- ISSN :
- 1463-9084
- Volume :
- 19
- Issue :
- 20
- Database :
- MEDLINE
- Journal :
- Physical chemistry chemical physics : PCCP
- Publication Type :
- Academic Journal
- Accession number :
- 28492651
- Full Text :
- https://doi.org/10.1039/c7cp01939d