Institute of High Energy Electronics, School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu 610054, China; Department of Physics, Nanjing University, Nanjing 210093, China
Abstract:
This paper reports that Zn0.97Mn0.03O thin films
have been prepared by radio-frequency sputtering technology followed
by rapid thermal processing in nitrogen and oxygen ambient
respectively. Magnetic property investigation indicates that the
films are ferromagnetic and that the Curie temperature (Tc) is over
room temperature. It is observed that the saturation magnetization
of the films increases after annealing in nitrogen ambience but
decreases after annealing in oxygen. Room temperature
photoluminescence spectra indicate that the amount of defects in the
films differs after annealing in the different ambiences. This
suggests that the ferromagnetism in Zn0.97Mn0.03O films is
strongly related to the defects in the films.