Sudhakar Yarlagadda, Peter B. Littlewood, Pinaki Majumdar, Ravindra Pankaj
We demonstrate that manganite heterostructures of the form $(Insulator)/(LaMnO_3)_n/(SrMnO_3)_n/(Insulator)$ show strong multiferroicity with magnetic ordering being induced by ferroelectric charge ordering. Ferroelectric polarization is produced by charges leaking from $LaMnO_3$ side to the $SrMnO_3$ side on account of the effective nearest-neighbor repulsion of electrons resulting from electron-phonon interaction. The origin of the ferromagnetism is due to double exchange when a particle virtually hops to its unoccupied neighboring site and back. Furthermore, we also demonstrate that a striking giant magnetoelectric effect occurs due to the strong coupling between the charge and spin orderings.
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http://arxiv.org/abs/1203.3283
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