Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1865843 | Physics Letters A | 2009 | 5 Pages |
Abstract
The structural stability and magnetic properties of Co-doped or -adsorbed polar-ZnO surface systems are investigated using first-principles calculations. It is found that Co ions energetically prefer to substitute for Zn in the outermost layer of both Zn- and O-terminated surfaces. Substitutional Co ions are antiferromagnetically coupled at ideal ZnO surfaces, which indicates additional defects or strain played a critical role in the reported ferromagnetism of ZnO : Co system. In addition, it is found that the adsorbed Co ions are preferred to ferromagnetic coupling, which may provide a new approach for spin injection of a ZnO film.
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Authors
Xiang Chen, Dan Huang, Wen-Ji Deng, Yu-Jun Zhao,