(a) S-0
(b) S-5
(c) S-30
(d) S-60
Figure 2: SEM micrographs of BFO films after annealing at  K for 0, 5, 30, and 60 min (the samples denoted as S-0, S-5, S-30, and S-60). The insets (c and d) reveal structural aspects in a greater detail, which disclose a difference between the S-60 sample (d) which contains BiFeO3 structure (refer to Figure 1) and the other materials (a, b, c).