Cobalt-doped ZnO powders with various dopant concentrations were synthesized using a simple-solid method. ZnO and Co<inf>3</inf>O<inf>4</inf> powders were employed as the precursors. The powders were annealed at 500-900 °C in air. The crystal structural and magnetic properties were studied by means of XRD and VSM, respectively. The XRD patterns show the hexagonal wurtzite structure of the powders. The magnetic measurements by H-M loops reveal the combination of paramagnetism and ferromagnetism as well as the influence of Co dopant to magnetic properties of Zn<inf>1-x</inf>Co<inf>x</inf>O.
