Observation of magnetoelectric coupling in (1 − x) BaTiO3/(x) La0.7Sr0.3MnO3 composites

Abstract

In the present work, we have synthesized BaTiO3 (BTO) and La0.7Sr0.3MnO3 (LSMO) composites, (1−x) BTO/(x) LSMO with x=0.05, 0.10, 0.15 and 0.20. X-ray diffraction (XRD) patterns show the peaks corresponding to both BTO and LSMO phase, which indicates the successful formation of composites. Polarization versus electric field (P–E) loops of sample with x=0.05 shows feeble ferroelectric behaviour which tends towards lossy capacitor behaviour for x=0.10. Further, no ferroelectric loop is observed for composites x=0.15 and 0.20. It is observed that the value of dielectric constant and dielectric loss is maximum for x=0.05 which decreases with the increment of LSMO content above x=0.05. Furthermore, room temperature magnetization versus magnetic field (M–H) loops shows the saturation magnetization enhances from 0.063 to 0.218emu/g for the sample x=0.05–0.20, respectively. Magnetoelectric study reveals that the value of quadratic magnetoelectric coefficient β decreases from 1.64×10−4 to 3.75×10−5mv/cmOe2 for the composites x=0.05 to x=0.10, which indicates that maximum magnetoelectric coupling is present in the sample x=0.05. Further, no magnetoelectric coupling is observed for the sample x=0.15 and 0.20.