Synthesizing ordered polar patterns in nonpolar SrTiO<sub>3</sub> nanofilms via wrinkle-induced flexoelectricity.

Moreover, flexoelectricity benefits from the size reduction ( 18 – 20 ) and plays a quite significant or even dominant role in the polar transition of van der Waals materials ( 21 ) or nanofilms ( 22 ), where large strain gradients (up to 10 6~7 m −1 ) and pronounced flexoelectricity are easier to achieve.

also in 5,695 other papers