Room-temperature ferromagnetism in carbon-doped ZnO.

By H. Pan, J. Yi, Lei Shen, R. Wu, J. Yang, Jianyi Lin, Y. Feng, Jun Ding, L. H. Van, J. Yin. Physical Review Letters, 2006

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We report ferromagnetism in carbon-doped ZnO. Our first-principles calculations based on density functional theory predicted a magnetic moment of 2.02 mu(B) per carbon when carbon substitutes oxygen in ZnO, and an ferromagnetic coupling among magnetic moments of the carbon dopants. The theoretical prediction was confirmed experimentally. C-doped ZnO films deposited by pulsed-laser deposition showed ferromagnetism with Curie temperatures higher than 400 K. The measured magnetic moment based on the content of carbide in the films [(1.5-3.0) mu(B) per carbon] was in agreement with the theoretical prediction. The magnetism is due to the Zn-C system in the ZnO environment.

Subfields: Electronic, Optical and Magnetic Materials, Materials Chemistry

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