Multiferroic magnetoelectric composites have been attracting much attention due to the significant applications for spintronics devices, high sensitive sensors, good performance storage and so on. In this work, lead-free Ba0.85Ca0.15Zr0.10Ti0.90 (BCZT) and La0.67Ca0.33MnO3 (LCMO) were selected as the ferroelectric and ferromagnetic phases, respectively, to prepare a new kind of BCZT/LCMO laminated composites by Plasma Activated Sintering. The structure, dielectric, ferroelectric and magnetoelectric properties of the laminated composites were mainly reported.
A perfect bonding of BCZT/LCMO interface without structural defects was demonstrated by SEM and TEM analysis, with the aggregation of Ca element at the interface. The ferroelectric and ferromagnetic characteristics demonstrated that the laminated composites were multiferroic in nature, and their performances showed strong dependence on the thickness ratio of BCZT to LCMO. With the increase of LCMO content in the laminated composites, the piezoelectric coefficient and coercive electric fields decreased, while the saturated magnetization increased and coercive magnetic field remained almost unchanged. The obtained remnant polarization, coercive electric field and magnetoelectric coefficient of the composites were found to be 10.1 uC/cm2, 1.97 kV/cm and 2.65 mV/cm Oe, respectively. Enhanced dielectric properties (εr = 7217, εm = 25097 at 1 kHz and room-temperature) were achieved in the BCZT/LCMO laminated composites, which could be attributed to the contribution of ferromagnetic LCMO and the Maxwell-Wagner model.