Abstract
Room temperature ferromagnetism in Cluster free films of vertically aligned Fe-doped ZnO nanorods have been developed. Controlled doping was carried out by iron (Fe) ion-implantation. The metal clusters formed during implantation are dissolved into the ZnO matrix by swift heavy ion irradiation of Fe-doped films using 200 MeV sliver beam. The origin of ferromagnetism in the Fe-doped ZnO nanorods is investigated. Raman spectra show shift of ZnO phonon mode to lower frequencies due to substitution of Zn by Fe. Rutherford backscattering spectrometry (RBS) studies are carried out to estimate the film thickness and concentration of Fe-ions as well as to establish the fact that the Fe-ions are placed in the ZnO matrix. We demonstrate cluster free nature of our nanorods using magnetization versus temperature analysis and the complex impedance spectroscopic studies. Dispersion of implanted Fe and lattice defects such as oxygen vacancies are attributed to be the source of ferromagnetism in nanorods.
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