The investigation of the electrical properties of Co-doped ZnO thin films provides two unexpected results: a decrease of the electrical conductivity and the contemporary occurrence of a reduction of conductivity and of an enhancement of ferromagnetic order. The former result is surprising since Zn atoms are replaced with iso-valent Co atoms. The latter finding questions previously suggested beneficial effects of n-type doping on the ZnO:Co magnetic behavior. While morphological and structural characterization permits us to exclude an influence of the morphology and of the presence of Co metal or Co-oxide phases on present experimental findings, with the aid of first-principles electronic structure calculations, we propose a qualitative picture which can explain in a coherent way both the changes in conductivity and ferromagnetic behavior ensuing from the Co doping and the above-mentioned, beneficial effects of n-type doping.
All Science Journal Classification (ASJC) codes
- Materials Chemistry
Di Trolio, A., Alippi, P., Ciatto, G., Scavia, G., Valentini, M., & Amore Bonapasta, A. (2015). The effect of Co doping on the conductive properties of ferromagnetic Zn. Journal of Materials Chemistry C, 3(39), 10188 - 10194. https://doi.org/10.1039/c5tc01586c