Ferroelectric field effect in ultrathin $SrRuO3$ films Available to Purchase

We report the observation of a ferroelectric field effect in the conducting oxide SrRuO₃ using Pb(Zr_0.52Ti_0.48)O₃/SrRuO₃ epitaxial heterostructures. Upon reversing the polarization of the ferroelectric Pb(Zr_0.52Ti_0.48)O₃ layer, we measured a 9% change in the resistance of a nominally 30 Å SrRuO₃ film at room temperature. This change was nonvolatile for a period of several days. Conductivity measurements taken between 4.2 and 300 K are consistent with $n$-type conduction throughout this temperature range. Hall effect measurements also yield $n$-type conduction, with $n≈2×1022$ electrons/cm³, and furthermore allow us to understand quantitatively the magnitude of the observed resistivity change.