Comparative studies of the structural and magnetic properties in Cu, Co codoped ZnO multilayer films sputtered on different substrates

The Zn 0.959 Cu 0.023 Co 0.018 O multilayer films on silicon and polystyrene particles array were prepared using RF magnetron sputtering technique. The influences of the substrate on structural and magnetic properties of Cu, Co codoped ZnO multilayer films were investigated by X-ray diffraction, Scanning electron microscope, X-ray photoelectron spectroscopy, and vibrating sample magnetometer. The results indicated that all the samples were the wurtzite structure with hexagonal shapes of ZnO holding different degree of preferred orientation, the Cu 2+ , Cu + and the Co 3+ , Co 2+ ions would uniformly substitute into the Zn 2+ sites of ZnO lattice in the samples sputtered on the different substrates. All the samples showed room temperature ferromagnetism, the saturation magnetization and the coercivity of the samples sputtered on the different substrates changed due to the chemical states of the Cu and anisotropy energy of the samples.