Effects of SrRuO3 on properties of functional oxide heterostructures
SrRuO3 is a ferromagnetic metallic oxide and is often used as an electrode material for epitaxial ferroelectric heterostructures. We fabricated SrRuO3/PbZr0.2Ti0.8O3/SrRuO3 and SrRuO3/La0.7Ba0.3MnO3/SrRuO3 tri-layers on SrTiO3(100) by PLD. Atomic resolution TEM showed that the first 3 unit cells of the ferroelectric PbZr0.2Ti0.8O3 layer have a reduced polarization, indicating that the bottom SrRuO3 layer may not be the best electrode for ferroelectric tunnel junctions. However, ferromagnetic properties of 2 unit cells thick La0.7Ba0.3MnO3 layers interfaced with SrRuO3 layers are much improved.