Fig. 1. (a) XRD patterns for all the samples. (b) Enlarged view of all the (101) diffraction peaks. (c) Average crystallite size, and interplanar spacing as a function of the annealing duration.

Fig. 2. SEM images for all samples.

Fig. 3. Raman spectra for all samples. The inset shows an enlarged view of all the E_g(1) Raman peaks.

Fig. 4. EPR spectra for all samples.

Fig. 5. Core level XPS spectra of Co 2p for all samples.

Fig. 6. Core level XPS spectrum of Ti 2p for the TC1 sample.

Fig. 7. Room-temperature hysteresis loops for all samples: (a) TC1, TC2, TC3, TC4, TC5, TC6, (b) TC7, (c) TC8.

Fig. 8. Saturation magnetization as a function of annealing duration for all samples.