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We report remarkable multiferroic effects in polycrystalline Bi2Fe4O9.High-resolution X-ray diffraction shows that this compound has orthorhombicstructure. Magnetic measurements confirm an antiferromagnetic transition around260 K. A pronounced inverse S-shape anomaly in the loss tangent of dielectricmeasurement is observed near the Neel temperature. This feature shifts with theapplication of magnetic field. These anomalies are indicative of substantialcoupling between the electric and magnetic orders in this compound.

Substantial magneto-electric coupling near room temperature in Bi2Fe4O9