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Electric polarization in conventional ferroelectric oxides usually involves nonmagnetic transition-metal ions with an empty d shell (the d0 rule). Here we unravel a new mechanism for local electric dipoles based on magnetic Fe3+ (3d5) ion violating the d0 rule (Fig. 1a). The competition between the long-range Coulomb interaction and short-range Pauli repulsion in a FeO5 bipyramid with proper lattice...
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