Magneto-electric coupling study in multiferroic La0.7Ba0.3MnO3–BaTiO3 composite ceramic at room temperature

A multiferroic La0.7Ba0.3MnO3–BaTiO3 composite sample was prepared by the solid state method. The composite exhibits a ferroelectric feature (2Pr=10.52 µC/cm2, 2Ec=32.2 kV/cm) and weak ferromagnetic feature (2Mr=13.6 memu/g, 2Hc=60.5 Oe). More importantly magneto-electric coupling, as well as magneto-capacitance and magneto-impedance effects, was also observed. The average changes of the 2Pr and 2Ec were −21.1% and −9.2%, respectively, when a relatively low external magnetic field (H=200 Oe) was applied. The MC value was ~−1.9% at 1 MHz after the sample was magnetized. These ME effects were mainly originated from the coexistence of magnetostriction and magneto-resistance in LBMO.