Preparation and Strong Magnetoelectric Effect of Multiferroic BaTiO_3/La_(2/3)Sr_(1/3)MnO_3 Composite Film

Using pulsed laser deposition technique,the multiferroic BaTiO3/La2/3Sr1/3MnO3composite bilayer films were epitaxially prepared on(001) oriented LaAlO3 single crystal substrate.The measurements of electric and magnetic properties showed that the composite structure possessed superior ferromagnetic and ferroelectric properties,its relative dielectric constant and ferromagnetic curie temperature were 263 and 317 K,respectively.The magnetoelectric voltage coefficient for the bilayer films at room temperature was around 176 mV/A,which was at least one order of magnitude higher than the previous reported in the same structures.The corresponding interface coupling parameter k was about 0.68,which indicated a better interface coupling between ferromagnetic and ferroelectric layers.