Influence of the microstructure on the magnetism of Co-doped ZnO thin films

Details Influence of the microstructure on the magnetism of Co-doped ZnO thin films Influence of the microstructure on the magnetism of Co-doped ZnO thin films

2006-04-20

arxiv.org/abs/cond-mat/0604468v1

J. Appl. Phys. 100 (2006) 013901

Physics

Condensed Matter

Materials Science

4 pages, 4 figures, to be published in Journal of Applied Physics (2006)

Scientific paper

10.1063/1.2206091

The prediction of ferromagnetism at room temperature in Co-ZnO thin films has generated a large interest in the community due to the possible applications. However, the results are controversial, going from ferromagnetism to non-ferromagnetism, leading to a large debate about its origin (secondary phase, Co clusters or not). By carefully studying the micro-structure of various Co-ZnO films, we show that the Co2+ partly substitutes the ZnO wurtzite matrix without forming Co clusters. Surprisingly, the ferromagnetism nature of the films disappears as the Co content increases. In addition, our results suggest that the observed ferromagnetism is likely associated to a large amount of defects- close to the interface and strongly depending on the growth temperature- which may explained the spreading of the results.

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