Magnetic properties of hydrogenated Li and Co doped ZnO nanoparticles

摘要

The effect of hydrogenation on the magnetic properties of Zn_(0.85)Co_(0.05)Li_(0.10)O nanoparticles is presented. It was found that the sample hydrided at room temperature (RT) showed weak ferromagnetism, while that hydrided at 400℃ showed robust ferromagnetism at room temperature. In both cases reheating the sample at 400℃ in air converts it back into the paramagnetic state completely. The characterization of samples by x-ray and electron diffraction showed that room temperature ferromagnetism observed in the samples hydrogenated at RT is intrinsic in nature, whereas that observed in the samples hydrogenated at 400℃ is partly due to the cobalt metal clusters.