Magnetic and electric properties of transition-metal-doped ZnO films

Abstract

3d-transition-metal-doped ZnO films (n-type ${\mathrm{Zn}}_{\text{1−x}}{\mathrm{M}}_x\mathrm{O}$ $\text{(x=0.05–0.25):}$ $\mathrm{M=Co},$ Mn, Cr, Ni) are formed on sapphire substrates using a pulsed-laser deposition technique, and their magnetic and electric properties are examined. The Co-doped ZnO films showed the maximum solubility limit. Some of the Co-doped ZnO films exhibit ferromagnetic behaviors with the Curie temperature higher than room temperature. The magnetic properties of Co-doped ZnO films depend on the concentration of Co ions and carriers.