Correlation of High Magnetoelectric Coupling with Oxygen Vacancy Superstructure in Epitaxial Multiferroic BaTiO₃-BiFeO₃ Composite Thin Films.

Epitaxial multiferroic BaTiO₃-BiFeO₃ composite thin films exhibit a correlation between the magnetoelectric (ME) voltage coefficient α and the oxygen partial pressure during growth. The ME coefficient α reaches high values up to 43 V/(cm·Oe) at 300 K and at 0.25 mbar oxygen growth pressure.