Detailed Study of Structural and Ferroelectric Properties in BaTiO3/La2/3Ca1/3MnO3 Bilayers Deposited by Pulsed-Laser Deposition

Workshop on Oxide Materials 2014: Novel Multifunctional Properties

物理学;材料科学

Ordoñez, J.E.^1 ; Gomez, M.E.^1 ; Lopera, W.^1 ; Prieto, P.^1,2

Department of Physics, Universidad Del Valle, Cali

A. A. 25360, Colombia^1

Center of Excellence for Novel Materials - CENM, Universidad Del Valle, Cali

A. A. 25360, Colombia^2

关键词: Bottom electrodes;    Ferroelectric layers;    Ferroelectric property;    Ferromagnetic properties;    Polarization loops;    Remnant polarizations;    Substrate temperature;    Thermally activated;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/614/1/012009/pdf
DOI  :  10.1088/1742-6596/614/1/012009

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

We have deposited ferroelectric BaTiO3(BTO), and ferromagnetic La2/3Ca1/3MnO3bilayers on SrTiO3substrates 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 La2/3Ca1/3MnO3layer is slightly modified by the presence of the BaTiO3layer. 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 BaTiO3measured at room temperature, using the La2/3Ca1/3MnO3layer as bottom electrode, show a maximum remnant polarization of 20 μC/cm2and minimal coercive field of 70 kV/cm. Thus, the bilayers maintain marked ferroelectric and ferromagnetic properties on individual layers.