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Ferroelectricity occurs in crystals with broken spatial inversion symmetry. In conventional perovskite oxides, concerted ionic displacements within a 3D network of transition‐metal–oxygen polyhedra (MOx) manifest spontaneous polarization. Meanwhile, some 2D networks of MOx foster geometric ferroelectricity with magnetism, owing to the distortion of the polyhedra. Because of the fundamentally different...
A one‐dimensional tetrahedral chain network in a brownmillerite structure gives rise to a coupled ferroelectric and ferromagnetic behavior. In article number 1808104, Woo Seok Choi and co‐workers describe the discovery of a room‐temperature ferroelectric ferromagnet in a SrFeO2.5 epitaxial thin film, which exhibits an unconventional combined polar distortion with the mechanism of the coupled ferro‐orderings...
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