CoFe2O4/BaTiO3 Composites via Spark Plasma Sintering with Enhanced Magnetoelectric Coupling and Excellent Anisotropy

Magnetoelectric (ME) ceramic composites of CoFe2O4 (CFO) and BaTiO3 (BTO) were prepared by spark plasma sintering. The CFO/BTO ceramic composites with fine microstructures exhibited a significant improvement in the ME voltage coefficient reaching up to 0.18 V/cm Oe. A perfect ME anisotropy was also observed in the CFO/BTO ceramic composites which consisted well with the fitted curve. The enhanced ME voltage coefficient alone with the perfect ME anisotropy in these ceramic composites provides a possibility of developing a magnetic field sensor capable of probing the strength as well as the direction of an unknown magnetic vector.