Optical and magnetic properties of Zn0.9-xCo0.1O : Al-x thin films

摘要

The high-T-c ferromagnetic property in Co-doped ZnO (ZCO), mediated by donor impurity band was tested by controlled introduction of shallow donors (Al) in the Zn0.9-xCo0.1O : Al-x (x = 0.005 and 0.01) thin films. The saturation magnetization for the 10 Co-doped ZnO (4 emu/cc) at 300 K reduces (similar to 0.8 emu/cc) due to Al doping. The resistivity drops abruptly, from similar to 10(3) Omega-cm for the ZCO film to 0.033 and 0.02 Omega cm for the 0.5 and 1.0 Al doped ZCO samples, respectively. The XPS measurements did not show any signature of metallic CO Clusters formation in these samples.