Investigation of magnetic properties and converse magnetoelectric effect in the composite of doped barium hexaferrite with potassium niobate, 0.5BaFe10Sc2O19-0.5KNbO3 and 0.5BaFe10In2O19-0.5KNbO3

This study investigates the magnetic and electric properties of the 0.5BaFe(10)Sc(2)O(19)-0.5KNbO(3) (0.5BFSc2O-0.5KNO) and 0.5BaFe(10)In(2)O(19)-0.5KNbO(3) (0.5BFIn2O-0.5KNO) composite samples. Refined X-ray diffraction (XRD) studies substantiate the presence of both ferrimagnetic (BFSc2O and BFIn2O) and ferroelectric KNbO3 phase with the ratio (0.5:0.5) in both the compounds without any impure phase. By electric poling the samples with an electric field of 2.5 kV/cm, magnetization shows a different behaviour (decreasing in Sc and increasing in doped composite), can be attributed to the electric field induced changes of spin states due to stress induced at the interface of ferrimagnetic (FM)/ferroelectric (FE) regions. Strong converse magnetoelectric coupling (CME) was observed in both the compounds, with a large electric field modulation in magnetism (80%) in the 0.5BFInO-0.5KNO composite. Dielectric studies reveal the presence of ferroelectric (FE-T-c) transition around the magnetic Curie temperature (FM-T-c) of respective composites, further indicates the presence of converse magnetoelectric coupling in both systems.

Automated summary

This study investigates the magnetic and electric properties of 0.5BFSc2O-0.5KNO and 0.5BFIn2O-0.5KNO composite samples. The results show the presence of both ferrimagnetic and ferroelectric phases in these compounds, with the properties being controlled by electric poling and stress induction. Strong converse magnetoelectric coupling effects are also observed.