Ferroelectric properties of SrRuO_3/BaTiO_3/SrRuO_3 ultrathin film capacitors free from passive layers

摘要

Structural studies on ultrathin SrRuO_3/BaTiO_3/SrRuO_3 capacitors, with BaTiO_3 thicknesses of between 5 nm and 30 nm, show well-defined interfaces between ferroelectric BaTiO_3 and electrode SrRuO_3 layers. In these capacitors, we cannot observe any extrinsic electrical effects due to either the formation of an insulating interfacial passive layer or passive-layer-induced charge injection. Such high-quality interfaces result in very good fatigue endurance, even for the 5 nm thick BaTiO_3 capacitor.