Enhanced ferromagnetic properties of diluted Fe doped ZnO with an Al co-doping

Al-added Zn0.99-xFexAl0.01O (x = 0, 0.02, 0.05) powders were prepared with an annealing in an Ar atmosphere at 1200 degrees C. All the peaks from the X-ray diffraction patterns of the samples belonged to the hexagonal (P6(3)mc) lattice of ZnO, and no indication of a secondary phase was found. The lattice parameters for the Zn0.99-xFexAl0.01O were a(0) = 3.254 angstrom and c(0) = 5.209 angstrom at room temperature. The hysteresis curve for the Zn0.99-xFexAl0.01O at room temperature revealed a ferromagnetic phase. The temperature dependency of the magnetization curve was measured from 60 to 350 K and revealed that the Curie temperature was above room temperature. In this study we demonstrated an enhanced ferromagnetic behavior due to an electric property change with an Al co-doping effect. (c) 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.