Polarization Screening Mechanisms at La 0.7 Sr 0.3 MnO 3 -PbTiO 3 Interfaces

The structural, electronic, and magnetic properties of interfaces between epitaxial La Sr MnO and PbTiO have been explored via atomic resolution transmission electron microscopy of a functional multiferroic tunnel junction. Measurements of the polar displacements and octahedral tilting show the competition between the two distortions at the interface and demonstrate strong dependence on the polarization orientation. The density functional theory provides information on the electronic and magnetic properties, where the interface termination plays a crucial role in the screening mechanisms.