Figure 7
Results of annealing of 1 at% Mn-doped ZnO under Ar and air atmosphere. (a) ESR spectra of 1 at% Mn-ZnO without and with annealing in air and Ar atmosphere, respectively. (b) M-H curves of 1 at% Mn-doped ZnO with and without annealing. The inset shows the enlarged area of the low magnetic field of (b). (c) XPS spectra of Mn 2p of 1 at% Mn-ZnO with and without annealing. (d) XPS spectra of O 1s of 1 at% Mn-ZnO with and without annealing.