Paramagnetic anisotropy of Co-doped ZnO single crystal

摘要

Zn_(0.95)Co_(0.05)O single crystal was obtained through hydrothermal crystal growth method. Extended x-ray absorption fine structure and x-ray absorption near-edge structure spectra as well as UV absorption measurements reveal that Co~(2+) ions have substituted Zn~(2+) ions and incorporated into ZnO lattice. The single crystal shows typical paramagnetic property from 2 to 300 K. A paramagnetic anisotropy property in the crystal is found. The single ion anisotropy origin from tetrahedral coordination Co in the ZnO lattice was introduced to explain the phenomena. This work verified the paramagnetic anisotropy phenomena in ZnO-Co.