Room temperature ferromagnetism in Mn-doped zinc oxide nanorods prepared by hybrid wet chemical route

摘要

Mn-doped (2.6-4.8 at%) aligned zinc oxide (Mn:ZnO) nanorod-fllms were synthesized by hybrid wet chemical route onto glass substrates. The chemical composition, structural, microstructural and magnetic studies were performed to investigate the origin of observed room temperature ferromagnetism (～0.11 μb/Mn) in these Mn doped ZnO nanorod-fllms. XPS studies indicated that incorporated Mn was in Mn~(2+) and Mn~(4+) states. Mn~(2+) atomic concentration was found to be significantly larger than Mn~(4+) concentration in all the samples. Disappearance of the Raman peak at ～577cm~(-1) arising due to the Zn interstitials may be related to the substitution of Mn~(2+) in the Zn~(2+) site with annealing. Thus, Mn metal inclusions as Mn~(2+) in the ZnO lattice are possibly responsible for such large magnetic moment in the films.