In this work, Ni-doped ZnO (Zn1xNixO, x¼0, 0.03, 0.06, 0.11) films were prepared using magnetron sputtering. X-ray diffraction (XRD), X-ray absorption spectroscopy (XAS), temperature dependence electrical resistance, Hall andmagnetic measurementswere utilized in order to study the properties of the Ni-doped ZnO films. XRD and XAS results indicate that all the samples have a ZnO wurtzite structure and Ni atoms incorporated into ZnO host matrix without forming any secondary phase. The Hall and electrical resistance measurements revealed that the resistivity increased by Ni doping, and all the Ni-doped ZnO films exhibited n-type semiconducting behavior. The magnetic measurements showed that for the samples with x¼0.06 and 0.11 are room-temperature ferromagnetic having a saturationmagnetization of 0.33 and 0.39 mB/Ni, respectively. The bound-magnetic-polaronmediated exchange is proposed to be the possible mechanism for the room-temperature ferromagnetism in this work.
Journal of Magnetism and Magnetic Materials, 323(6), 829-832