Title :
Ferromagnetism in Ti-Doped ZnO Nanoclusters Above Room Temperature
Author :
Antony, Jiji ; Pendyala, Sweta ; McCready, David E. ; Engelhard, Mark H. ; Meyer, Daniel ; Sharma, Amit ; Qiang, You
Author_Institution :
Dept. of Phys., Idaho Univ., Moscow, ID
Abstract :
Ferromagnetism is observed at room temperature, when a small percentage (5%) of nonmagnetic 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 magnetron sputtering with aggregation. A Superconducting 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
Keywords :
II-VI semiconductors; SQUIDs; ferromagnetic materials; sputter deposition; titanium; zinc compounds; SQUID; ZnO:Ti; dilute magnetic semiconductors; ferromagnetic semiconductors; ferromagnetism; high-pressure magnetron sputtering; magnetic oxides; nanocluster films; nonmagnetic titanium; oxygen atmosphere; superconducting quantum interference device; Atmosphere; Atomic measurements; Magnetic films; SQUIDs; Sputtering; Superconducting films; Superconducting magnets; Temperature; Titanium; Zinc oxide; Doped ZnO nanoclusters; dilute magnetic semiconductors; ferromagnetic semiconductors; magnetic oxides;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2006.879723
