Variations of surface roughness for deposition of Co-sputtered-ZnO(002) by Auger electron spectroscopy and surface magneto-optic Faraday effectY.-C. Chang, C.-W. Su, S.-C. Chang and Y.-H. LeeEur. Phys. J. Appl. Phys., 53 2 (2011) 21501DOI: https://doi.org/10.1051/epjap/2010100312