Magnetic behavior of La$_{2/3}$Ca$_{1/3}$MnO$_{3}$ / BaTiO$_{3}$ bilayers*

We have grown ferroelectric BaTiO$_{3}$(BTO) and ferromagnetic La$_{2/3}$Ca$_{1/3}$MnO$_{3}$ (LCMO) onto (001) SrTiO$_{3}$ and Nb:SrTiO$_{3}$ by pulsed laser deposition (PLD) at pure oxygen atmosphere, and a substrate temperature of 820$^{\circ}$ C, seeking for a multiferroic behavior in this structure. From x-ray diffraction (XRD) we found lattice parameter a$_{BTO}$=4.068 {\AA}, and a$_{LCMO}$=3.804 {\AA}, for each individual layer. In the BTO/LCMO bilayer, (002)-Bragg peak for BTO maintain its position whereas (002) LCMO peak shift to lower Bragg angle indicating a strained LCMO film. Magnetization measurements reveal an increase in the Curie temperature from 170 K to 220 K for the bilayer when LCMO (t = 47 nm) is deposited on BTO (t=52 nm) film, while depositing the BTO (50 nm) above LCMO (48 nm) the Curie temperature remains at values close to that obtained for a LCMO single layer ($\sim$175 K), deposited under identical growth parameters