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Process-dependent magnetic properties of Co-doped ZnO in bulk and thin film form

Ghoshal, Sayak and Anil Kumar, PS (2008) Process-dependent magnetic properties of Co-doped ZnO in bulk and thin film form. In: Journal of Magnetism and Magnetic Materials, 320 (12). L93-L96.

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Structural, optical and magnetic studies of Co-doped ZnO have been carried out for bulk as well as thin films. The magnetic studies revealed the superparamagnetic nature for low-temperature synthesized samples, indicating the presence of cobalt metallic clusters, and this is supported by the optical studies. For the high-temperature sintered samples one obtains paramagnetism. The optical studies reveal the presence of Co2+ ions in the tetrahedral sites indicating proper doping. Interestingly, the films deposited by laser ablation from the paramagnetic target showed room temperature ferromagnetism. It appears that the magnetic nature of this system is process dependent.

Item Type: Editorials/Short Communications
Publication: Journal of Magnetism and Magnetic Materials
Publisher: Elsevier Science
Additional Information: Copyright of this article belongs to Elsevier Science.
Keywords: Ferromagnetism;DMS;ZnO;Superparamagnetism.
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 30 Mar 2010 07:40
Last Modified: 19 Sep 2010 05:58
URI: http://eprints.iisc.ac.in/id/eprint/26681

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