|About this Abstract
||Materials Science & Technology 2011
||MS&T'11 Poster Session
||205 Reversible Ferromagnetic Switching in Undoped and Doped (Co and Mn) ZnO Thin Films
||Siddhartha Mal, Sudhakar Nori, John T Prater, Jagdish Narayan
|On-Site Speaker (Planned)
We have introduced defects in ZnO (undoped and doped with Co and Mn) epitaxial thin films using laser irradiation with the aid of nanosecond laser pulses and thermal annealing. In contrast to the as grown samples, the laser irradiated films show a significant decrease in resistivity, enhancement in UV emission, while maintaining the same wurtzite crystal structure. Room-temperature ferromagnetism (RTFM) is observed in laser-irradiated samples, which increased with the number of laser pulses up to a certain value where it saturates and decreases upon subsequent increase in the number of pulses. The induced ferromagnetism as well as the enhanced electrical conductivity can be eliminated with thermal annealing. Reversible ferromagnetism was also demonstrated in both Co and Mn doped ZnO thin films using laser irradiation and thermal treatments and that the magnetization in Co and Mn doped films were found to be strong function of growth conditions.