Interface induced giant magnetoelectric coupling in multiferroic superlattices

Details Interface induced giant magnetoelectric coupling in multiferroic superlattices Interface induced giant magnetoelectric coupling in multiferroic superlattices

2011-07-22

arxiv.org/abs/1107.4404v1

Physics

Condensed Matter

Materials Science

Scientific paper

The electric and magnetic properties of (BaTiO$_3$)$_n$/(CaMnO$_3$)$_n$ short-period superlattices are studied by the first-principles calculations. The local electric polarizations in the CaMnO$_3$ layers are significant, comparable to that in the BaTiO$_3$ layers. Remarkably, the electric polarization is almost doubled when the spin configuration changes from antiferromagnetic to ferromagnetic in the superlattices, indicating a giant magnetoelectric coupling. This enhancement of the magnetoelectric coupling is due to the suppression of the antiferrodistortive mode in the CaMnO$_3$ layers at the interfaces.

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