Ultra-high resistive switching current ratio and improved ferroelectricity and dielectric tunability performance in a BaTiO 3 /La 0.7 Sr 0.3 MnO 3 heterostructure by inserting a SrCoO 2.5 layer.

A BaTiO 3 /SrCoO 2.5 (BTO/SCO) bilayer and a BTO single film were prepared by radio frequency magnetron sputtering on La 0.7 Sr 0.3 MnO 3 (LSMO) buffered SrTiO 3 (001) substrates. Interestingly, compared with reported BTO-based films, the BTO/SCO/LSMO heterostructure has a maximum ON/OFF current ratio of ∼945. More interestingly, compared with the BTO single layer, a larger P r (∼18.4 μC cm -2 ) and larger dielectric tunability (∼71.9%) were achieved in the BTO/SCO bilayer. The improved performance may be attributed to the large tetragonality and improved oxygen vacancy concentrations in the BTO/SCO/LSMO heterostructure. Furthermore, our BTO/SCO/LSMO stacks exhibit potential for flexible electronic informational devices.