Figure 4
(a) M–H loops of exchange bias (EB) and E-field control effect from P0 to P+, the situation near zero field is amplified in the inset. (b) The M–H curve switching between P+ and P- states which are multi-times reversible, the situation near zero field is amplified in the inset. (c) The M–H curve switching between the polarization P+ state to the P++ state (by applying a +8 kV/cm polarization voltage).
