Effect of preferred orientation on magnetoelectric properties of multiferroic La0.7Sr0.3MnO3/BaTiO3 heterostructure

The epitaxial La0.7Sr0.3MnO3/BaTiO3 bilayer heterostructures were deposited on LaAlO3 (001) and (110) substrates by pulsed laser deposition. The inherent ferromagnetic, ferroelectric properties and strong magnetoelectric (ME) effect at room temperature were approved, which correlated to the preferred orientation of the films. Both heterostructures showed similar frequency-dependent ME behavior in 0.1 kHz–100 kHz, the ME voltage coefficients were around 140 mV/cm Oe and 104.8 mV/cm Oe at 1 kHz for (001) and (110) oriented bilayers, respectively. This was at least one order of magnitude higher than previously reported results of the related heterostructures, which is mainly ascribed to the lower dielectric constant of BTO film.