Figure 4

STEM of Si-Pt/CoFe₂O₄/BNT-BT_0.08 heterostructure thin film. (a) High-angle annular dark-field imaging (HAADF). (c–h) Elemental maps of Co (c), Fe (d), Bi (e), Na (f), Ti (g) and O (h) for CoFe₂O₄/BNT-BT_0.08 bilayered composite deposited on Pt (b) substrate.