Significant enhancement of room temperature ferromagnetism in surfactant   coated polycrystalline Mn doped ZnO particles
  We report a surfactant assisted synthesis of Mn doped ZnO polycrystalline samples showing robust room temperature ferromagnetism as characterized by X-ray diffraction analysis, Transmission Electron Microscopy, Electron Paramagnetic Resonance and DC magnetization mearurements. This surfactant assisted synthesis method, developed by us, is found to be highly reproducible. Further, it can also be extended to the synthesis of other transition metal doped ZnO. 
O. D. Jayakumar, I. K. Gopalakrishnan, C. Sudakar, R. M. Kadam and S.   K. Kulshreshtha