Carbon-doped ZnO: A New Class of Room Temperature Dilute Magnetic Semiconductor

Details Carbon-doped ZnO: A New Class of Room Temperature Dilute Magnetic Semiconductor Carbon-doped ZnO: A New Class of Room Temperature Dilute Magnetic Semiconductor

2006-10-31

arxiv.org/abs/cond-mat/0610870v1

Physics

Condensed Matter

Materials Science

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Scientific paper

We report magnetism in carbon doped ZnO. Our first-principles calculations based on density functional theory predicted that carbon substitution for oxygen in ZnO results in a magnetic moment of 1.78 $\mu_B$ per carbon. The theoretical prediction was confirmed experimentally. C-doped ZnO films deposited by pulsed laser deposition with various carbon concentrations showed ferromagnetism with Curie temperatures higher than 400 K, and the measured magnetic moment based on the content of carbide in the films ($1.5 - 3.0 \mu_B$ per carbon) is in agreement with the theoretical prediction. The magnetism is due to bonding coupling between Zn ions and doped C atoms. Results of magneto-resistance and abnormal Hall effect show that the doped films are $n$-type semiconductors with intrinsic ferromagnetism. The carbon doped ZnO could be a promising room temperature dilute magnetic semiconductor (DMS) and our work demonstrates possiblity of produing DMS with non-metal doping.

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