Magneto-electric effect in multiferroic Ni_0.93Co_0.02Mn_0.05Fe_1.95O_4-δ /PbZr_0.52Ti_0.48O₃ particulate composites: dielectric, piezoelectric properties

Abstract

Magnetoelectric composites have been synthesized by sintering mixtures of highly piezoelectric component Pb(Zr_0.52Ti_0.48)O₃, PZT and highly magnetostrictive piezomagnetic component Ni_0.93Co_0.02Mn_0.05Fe_1.95 O_4-δ , NCMF. These composites with generic formula (1 − x)PZT + xNi_0.93Co_0.02Mn_0.05Fe_1.95O_4-δ , where x varies as 0.1, 0.3 and 0.5 mole fractions, were prepared from the powders of the pure components by the conventional ceramic route. The presence of two phases in multiferroic was confirmed by XRD technique. The variation of dielectric constant and dissipation factor, as a function of frequency from 100 Hz to 1 MHz and in the temperature range of 30-500°C were studied. The piezoelectric d₃₃ coefficient of these composites was also studied in these composites. The magnetoelectric (ME) output voltage was measured in terms of the dE/dH as a function of magnetic bias field. A high value of ME output (1200 mV/Oe·cm) was obtained in the composite containing 70% ferroelectric phase (PbZr_0.52Ti_0.48O₃) and 30% ferrite phase (Ni_0.93Co_0.02Mn_0.05Fe_1.95O_4-δ). These multiferroic particulate composites are used as sensors and transducers.