Raman scattering and high temperature ferromagnetism of Mn-doped ZnO nanoparticles

Raman scattering has been used to study the influence of manganese, an effective dopant to obtain ZnO diluted magnetic semiconductors, on the lattice dynamics of ZnO. It is found that Mn doping increases the lattice defects and induces two Raman vibration modes of 275 and 526 cm(-1). On the other hand, high temperature (T-C higher than 350 K) ferromagnetism is observed in Zn1-xMnxO (x <= 0.02) nanoparticles. It is found that the ferromagnetism of Zn1-xMnxO nanoparticles is strongly related to defects in ZnO. (c) 2006 American Institute of Physics.