fig4

Figure 4. Domain structures of the T_a/O_c phase in (110)-oriented PTO thin films under the anisotropy strains of ε₁₁ = 0% and ε₂₂ = -4%. (A) The 3D domain structure; (B) The vertical cross-section; (C) The horizontal cross-section of the white dashed boxes in (A) The bars in (B and C) indicate 10 nm.