Magnetic and electrical properties on possible room temperature hybrid multiferroic BaTiO$_{3}$/La$_{2/3}$Sr$_{1/3}$MnO$_{3}$

We addressed to deposit the ferromagnetic phase of the La$_{\mathrm{1-x}}$Sr$_{\mathrm{x}}$MnO$_{3}$ and the ferroelectric BaTiO$_{3}$ for possible hybrid multiferroic heterostructure. We have optimized the growth parameters for depositing BaTiO$_{3}$(BTO) / La$_{2/3}$Ca$_{1/3}$MnO$_{3}$(LCMO) / (001) SrTiO$_{3}$ by sputtering RF and DC, respectively, in pure oxygen atmosphere and a substrate temperature of 830$^{\circ}$C. Keeping fixed the magnetic layer thickness (t$_{\mathrm{LSMO}}=$40 nm) and varying the thickness of the ferroelectric layer (t$_{\mathrm{BTO}}=$20, 40, 80, 100 nm). We want to point out the influence of the thicknesses ratio (t$_{\mathrm{BTO}}$/t$_{\mathrm{LSMO}})$ on electrical and magnetic properties. From x-ray diffraction (XRD) analysis, we found the bragg peaks for LSMO maintain its position but BTO peak shift to lower Bragg angle indicating a strained BTO film. Magnetization and polarization measurements indicate a possible multiferroic behavior in the bilayers. Hysteresis loop measurements of bilayers show ferromagnetic behavior.