Research Papers in Physics and Astronomy
Date of this Version
We report the structure and magnetic properties of Zn1-xMnxO thin films grown on Si(001) substrates by pulsed laser deposition. Structure and phase evolution with Mn doping has been studied using x-ray diffraction, electron diffraction, and high-resolution electron microscopy. The undoped and 1% Mn-doped ZnO films are completely (001) oriented, and further Mn doping deteriorates the (001) orientation. For Mn concentrations below 3%, only the hexagonal ZnO phase exists in the films without secondary phases. As the Mn concentration reaches 5%, secondary phase Mn2O3 was found aggregating at grain boundaries. All the Mn-doped films show ferromagnetic properties at room temperature, and the magnetic moment decreases as the Mn concentration increases. Our results suggest that the ferromagnetism observed in Zn1-xMnxO thin films is intrinsic rather than associated with secondary phases.
Published in Journal of Physics: Condensed Matter 19 (2007), 036210 (8 pp) doi:10.1088/0953- 8984/19/3/036210 Online at http://stacks.iop.org/JPhysCM/19/036210 Copyright © 2007 IOP Publishing Ltd. Used by permission.