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

Abstract

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 KNbO 3 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. • Magnetic and magnetoelectric properties of the composite of doped barium hexaferrite with potassium niobate are studied. • Refined XRD show both ferroelectric KNbO3 and ferrimagnetic BaFe10Sc2O19 and BaFe10In2O19 phases present with a 50:50 ratio. • DC magnetization shows different doping element in the ferrites leads to different magnetic behaviour after electric poling. • Converse magnetoelectric coupling of 45% in 0.5BaFe10Sc2O19-0.5KNbO3 and 80% in 0.5BaFe10In2O19-0.5KNbO3 was observed. • Dielectric studies show the ferroelectric transition around their respective magnetic Curie temperature in both the systems.