Ferromagnetism is observed at room temperature, when a small percentage (5%) of non-magnetic titanium is added to zinc atoms to form Ti-doped ZnO nanoclusters in the oxygen atmosphere. The nanocluster films are prepared at room temperature by a technique that is a combination of high pressure sputtering along with aggregation. A Super-conducting Quantum Interference Device (SQUID) measures the magnetic properties of this cluster films at various temperatures. Ti dopant exhibits +4 oxidation state through out the cluster film. Coercivity of the samples decreased exponentially with the increase of temperature.
Revised: April 7, 2011 |
Published: October 10, 2006
Citation
Antony J., S. Pendyala, D.E. McCready, M.H. Engelhard, D. Meyer, A.M. Sharma, and Y. Qiang. 2006.Ferromagnetism in Ti-Doped ZnO Nanoclusters above Room Temperature.IEEE Transactions on Magnetics 42, no. 10:2697-2699.PNNL-SA-48848.doi:10.1109/TMAG.2006.879723