Abstract
We have deposited ferroelectric BaTiO3 (BTO), and ferromagnetic La2/3Ca1/3MnO3 bilayers on SrTiO3 substrates by pulsed-laser deposition at pure oxygen atmosphere and substrate temperature of 820 °C, keeping fixed the magnetic layer thickness (tLCMO) at 50 nm and varying the thickness of the ferroelectric layer (tBTO) from 20 to 100 nm. X-ray diffraction analysis indicates a textured growth of both layers. The lattice parameter of the La2/3Ca1/3MnO3 layer is slightly modified by the presence of the BaTiO3 layer. Resistivity versus temperature Arrhenius plots show a small polaron thermally activated conductivity in bilayers with activation energies from 120 to 135 meV. Polarization loops at the BaTiO3 measured at room temperature, using the La2/3Ca1/3MnO3 layer as bottom electrode, show a maximum remnant polarization of 20 μC/cm2 and minimal coercive field of 70 kV/cm. Thus, the bilayers maintain marked ferroelectric and ferromagnetic properties on individual layers.
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