Large magnetoelectric coupling in ferromagnetic/ferroelectric superlattices with asymetric interfaces

Abstract In this Letter, we investigate an attractive approach providing large and cumulative magnetoelectric coupling in ferromagnetic/ferroelectric superlattice by inserting a monolayer of different metal (ferromagnetic or normal metal) at one interface. Using first-principles calculations on FeM/PbTiO3 (M=Ni, Pt and Ag) as a model system, the recorded high magnetoelectric coefficients are obtained in one unit cell with the insertion of Ni and Pt monolayer. A carefully analysis reveals that the large magnetoelectric effects are determined by combinations of several different mechanisms including interface bonding, spin-dependent screening, and distinct type of magnetic interactions.