Structure and magnetism of Zn _0.9 Co _0.1 O DMS films prepared by chemical solution deposition method

The Zn _0.9 Co _0.1 O films are fabricated by chemical solution deposition method. All the films have the ZnO wurtzite structure with a preferential orientation along the c-axis. The analysis of X-ray near-edge absorption spectroscopy and X-ray photoelectron spectroscopy indicates that the valence of Co is +2, and there are oxygen vacancies in Zn _0.9 Co _0.1 O films annealed in Ar atmosphere. Extended X-ray absorption fine structure results reveal that Co ²⁺ ions have dissolved into ZnO and substituted for Zn ²⁺ ions. Magnetization measurements show that the film annealed in Ar exhibits ferromagnetism which can be explained by the formation of bound magnetic polarons.