The synthesis of Al codoped ZnO:Co dilute magnetic semiconductor (DMS) bulk films using metalorganic chemical vapor deposition, and DMS superlattices by ion beam sputtering (IBS), with the Curie temperature higher than the room temperature was analyzed. The magnetization, magnetoresistance, and resistivity measurements, which were performed in the temperature range of 2.5-300 K, were also analyzed. The morphology of the DMS films and superlattices was investigated using x-ray diffraction. It was found that overdoping with cobalt had resulted in the supression of high temperature ferromagnetism in the multilayers, and a crossover to superparamagnetism with varied dimensionality.
ASJC Scopus subject areas
- Physics and Astronomy(all)