Abstract
We work out theoretically a mechanism for magnetoelectric (ME) coupling driven by a buildup of an interfacial spiral spin density in ferromagnet (FM)/ferroelectric (FE) composites. We infer an intrinsic linear ME coupling that is most pronounced in the vicinity of the FM/FE interface acting within the spin-diffusion length ${\ensuremath{\lambda}}_{m}$ of the order of nanometers. Our study delivers a strong coupling strength for $\mathrm{Co}(40 \mathrm{nm})/{\mathrm{BaTiO}}_{3}$ that is in line with experiments. We identify a region of magnetic noncollinearity coupled to dielectric polarization that extends over ${\ensuremath{\lambda}}_{m}$ around the interface, functionalizing the interface for electric control of magnetotransport and surface magnetic anisotropy.
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