The effect of interface oxygen content on magnetoelectric effect of epitaxial La0.7Sr0.3MnO3/BaTiO3 bilayer.

The epitaxial La0.7Sr0.3MnO3/BaTiO3 (LSMO/BTO) bilayer ?lms are grown on (001) oriented LaAlO3 substrate by pulsed laser deposition technique. The oxygen-rich interface is obtained through in-situ annealing process in oxygen, and the oxygen-deficient interface is obtained without the annealing process. The results show that the ferromagnetic properties of the LSMO film and the magnetoelectric effect (ME) of the bilayer films strongly correlate to the oxygen content at the interface of LSMO/BTO. The saturated magnetization and the ME voltage coefficient of the oxygen-rich bilayer film are higher than that of oxygen-deficient one. It suggests a more effective ME coupling at the LSMO/BTO interface, which are generated through not only the interface strain but also the spin polarized carriers. [ABSTRACT FROM AUTHOR]