Evidence of Magneto-electric Coupling in Y-type Hexaferrite Ba2Mg2Fe12O22

Abstract

In this work polycrystalline Y-type hexaferrite Ba2Mg2Fe12O22 (BMFO) was synthesized using the sol-gel autocombustion method. Room temperature Rietveld refinement of the X-ray diffraction pattern confirms the phase purity with hexagonal crystal structure (R-3m space group). Temperature dependence DC electrical resistivity suggested polaronic hopping conduction. The activation energy was calculated 0.21 eV which is the same for both the cases with field (1T) and in the absence of field. It was evident that BMFO shows zero magnetoresistance. Temperature dependent dielectric study attributes the ferroelectric transition at ~ 520 K. Temperature-dependent magnetic study observed the phase change at 𝑇𝐶 ~ 515 K. Field dependent magnetization study observed the maximum saturation magnetization of 18.39 emu/g in the presence of ±1.5 T. Dielectric and magnetic data appearing nearly same temperature, which indicates the presence of magneto-electric (ME) coupling in the compound.