Magnetic properties and magneto electric effect in ferroelectric rich Ni 0.5Zn 0.5Fe 2O 4+BPZT ME composites

Abstract

Magneto electric composites with composition ( x) Ni 0.5Zn 0.5Fe 2O 4+(1– x) Ba 0.8Pb 0.2Zr 0.8Ti 0.2O 3 (BPZT—barium lead zirconate titanate) in which x varies as 0.0, 0.15, 0.30, 0.45 and 1.0 mol% were prepared by standard double sintering ceramic method. The presence of constituent phases such as ferrite and ferroelectric was confirmed by X-ray diffraction. The structural analyses were carried out by using X-ray diffraction pattern. Scanning electron micrographs (SEM) were taken to understand the microstructure of the samples. The calculated values of the porosity of the samples lie between 4.5% and 16.2%. The hysteresis measurements were made to determine saturation magnetization ( M s), magnetic moment ( μ B) and coercivity ( H c). From the AC susceptibility measurements the contribution of both the single domain (SD) particles of the ferrite phase and mixed domain (SD+MD) particles of the composites in ME output were explained. The static magneto electric voltage coefficients (d E/d H) H were measured as a function of intensity of magnetic field and the maximum ME coefficient were observed for the composites with 30% of ferrite+70% of ferroelectric phase.