Multiferroic properties of composites made up of ferromagnetic Co_0.9Ni_0.1Fe₂O₄ and La_0.67Sr_0.33MnO₃ with ferroelectric 0.5Ba_0.7Ca_0.3TiO₃-0.5BaZr_0.2Ti_0.8O₃

In the present study, the effect of the composites made up of magnetostrictive Co_0.9Ni_0.1Fe₂O₄ (CNFO) and colossal magnetoresistive La_0.67Sr_0.33MnO₃ (LSMO) ferrites with the ferroelectric solid solution of 0.5Ba_0.7Ca_0.3TiO₃-0.5BaZr_0.2Ti_0.8O₃ (0.5BCT-0.5BZT) on the multiferroic properties are studied comparatively. Here, the magnetodielectric (MD) composite of 0.5(CNFO)-0.5(0.5BCT-0.5BZT) and 0.175(LSMO)-0.825(0.5BCT-0.5BZT) investigated comparatively using various characterization techniques. The simple and low-cost hydroxide co-precipitation method was used for the synthesis of individual constituents of the ferroelectric 0.5BCT-0.5BZT and ferromagnetic CNFO and LSMO. Structural studies of composites verified the existence of ferrite and ferroelectric phases. The microstructure displays the LSMO and CNFO particles arranged in close proximity over the BCT-BZT ferroelectric phase. The dielectric constant and tangent loss (Quality factor) variation of the composites were investigated for 100 Hz to 1 MHz frequency from room temperature to higher temperatures upto 500 °C. The magnetic hysteresis plot can be used to study how the composite saturation magnetization increases with an increase in ferrite content. Magnetocapacitance measurements up to 1 Tesla magnetic field gives 7% and 2.5% MD coefficients for the both composite materials.