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Reduced room-temperature ferromagnetism in intermediate conducting regime of V doped ZnO

by: S. H. Liu, H. S. Hsu, G. Venkataiah, X. Qi, C. R. Lin, J. F. Lee, K. S. Liang, J. C. A. Huang
Applied Physics Letters, Vol. 96, No. 26. (2010), 262504, doi:10.1063/1.3456381  Key: citeulike:11936193

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Abstract

The mechanism of room temperature (RT) ferromagnetism for low doping concentration of 2.5% V in ZnO have been systematically discussed by measuring structural, electrical, and magnetic properties. The evolution of the Curie temperature from above RT in insulated V:ZnO powders to 270 K in semiconducting samples was observed with increasing carrier concentration by using different hydrogenated annealing treatment. The results provide a direct observation that the free carriers suppress the ferromagnetism and might be associated the phenomena of charge-transfer and interaction between bound magnetic polarons.


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