Figure 3

Ferroelectric field effect device.
(a) Photograph of a patterned device for PFM and transport experiments. (b) PFM phase image of the active area [white rectangle in (a)] in the as-patterned device, showing a uniform polarization in T-BFO pointing toward CMO (Pdown). (c) PFM phase image after writing with −8 V, demonstrating the reversed polarization (Pup).