X-ray absorption study of the local order around Mn in Mn:ZnO thin films: the role of vacancies and structural distortions

This work reports an x-ray absorption near-edge structure spectroscopy (XANES) study at both Mn and Zn K edges in Zn0.95Mn0.05O thin films prepared with different sputtering gases (pure Ar, Ar/N-2 and Ar/O-2). We have studied the local order around Mn in the films, with special emphasis on the role played by both oxygen and zinc vacancies and by the structural distortion associated with the substitution of Zn by Mn in the ZnO host. Our results indicate that the dependence of the magnetic properties of these Mn: ZnO thin films on the different sputtering gases used in the preparation is related to the structural distortion around Mn sites.