“…60,61,70, BFO-based multilayer structures have been shown to promote the desired electrical properties and/or new physical phenomena, 60,61,70,71,77,110, such as a larger remnant polarization, improved magnetoelectric coupling, and photovoltaic behavior. 61,70,[366][367][368][369][370][371][372][373][374][375][376][377][378][379][380][381][382][383][384]772,848,849 Although some of the properties of BFO thin films can be improved by forming the heterostructure, the P r value is often limited to below 60 μC/cm 2 60,70,366-375,377-379,381,383,384 due to the additive layers having lower or even zero P r values. There have been surprisingly large P r values reported for the heterostructure films consisting of BFO and non-ferroelectric layers.…”