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

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• 作者：Sayak Ghoshal ; P.S. Anil Kumar
• 关键词：Ferromagnetism ; DMS ; ZnO ; Superparamagnetism
• 刊名：Journal of Magnetism and Magnetic Materials
• 出版年：2008
• 出版时间：June 2008
• 年：2008
• 卷：320
• 期：12
• 页码：L93-L96
• 全文大小：455 K

文摘

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.