Electrically reversible magnetization at the antiperovskite/perovskite interface

Using density-functional calculations, we predict the emergence of electrically reversible magnetization at the interface between antiferromagnetic noncollinear antiperovskite GaNMn₃ and ferroelectric perovskite BaTiO₃. We find that Mn magnetic moments are enhanced and reoriented at the GaNMn₃/ATiO₃ (001) (A=Sr and Ba) interface, resulting in a sizable net magnetization along the [110] direction. This magnetization is reversed with ferroelectric polarization of BaTiO₃ through ~20^∘ rotation of the noncollinear magnetic moments. The effect is driven by ferroelectric modulation of the antiferromagnetic exchange coupling between the interfacial Mn atoms mediated by the Mn-$3d$ orbital population. Our results open opportunities for controlling the magnetic properties by electric fields by exploiting noncollinear antiferromagnetism at antiperovskite/perovskite interfaces.