Signature of multiferroicity and pyroelectricity close to room temperature in BaFe12O19 hexaferrite

Abstract In this paper, we have reported the signature of multiferroicity and pyroelectricity in BaFe 12 O 19 hexaferrite close to room temperature. The BaFe 12 O 19 hexaferrite samples are synthesized by co-precipitation method at different sintering temperature ranging from 800 to 1200 °C and study their structural, ferroelectric, magnetic, magnetoelectric and pyroelectric properties. X-ray Diffraction patterns show the pure phase formation for all samples. Morphological changes are examined through the scanning electron microscope. The maximum ferroelectric polarization (0.66 μC/cm 2 ) is observed for the sample sintered at 1200 °C, however maximum magnetic polarization 74 emu/g is observed for sample sintered at 1000 °C. Magneto-electric coupling measurements are also performed through dynamic method and average magneto-electric coupling coefficient (~ 7.05 × 10 −7 mV/cm Oe 2 ) is observed at room temperature for the sample sintered at 1200 °C. Furthermore, maximum pyroelectric constant (147 × 10 −13 C/cm 2 °C) is observed at 75 °C for BaFe 12 O 19 samples sintered at 1200 °C. The observation of both multiferroicity and pyroelectricity close to room temperature in BaFe 12 O 19 hexaferrite is interesting and useful for multifunctional devices.