fig2
From: Nonvolatile multistate memories in BiFeO3-based nanocomposites designed by phase-field simulations
Figure 2. Influence of pillar size on phase stability. (A) Electric hysteresis loops of BFO pillar films at 2 MV/cm for various pillar diameters d; (B) Three-dimensional polarization vectors corresponding to four stable states for d = 8 nm. The vector colors represent the magnitude of out-of-plane polarization Pz; (C and D) Free energy densities and polarization evolution for d = 8 nm; (C) and for d = 6 nm and 12 nm (D) from specific states in the hysteresis loops indicated by purple triangles in (A) under zero electric field. BFO: BiFeO3； OOP: out-of-plane.
