Papers by Author: Amit Kumar

Abstract: Multiferroic composite films of (i) Co_0.6Zn_0.4Fe₂O₄(CZFO)-PbTi_0.7Zr_0.3O₃(PZT)-poly (vinylidene-fluoride)(PVDF) and (ii) Co_0.6Zn_0.4Fe₂O₄-BaTi_0.7Zr_0.3O₃(BZT)-PVDF were prepared by hot press method for magneto-dielectric studies. Different multiferroic composite films were named as CPT-1 (CZFO:PZT; 3:1) CPT-2 (CZFO:PZT; 3:2), CPT-3(CZFO:PZT; 3:3), CBT-1 (CZFO:BZT; 3:1), CBT-2 (CZFO:BZT; 3:2) and CBT-3 (CZFO:BZT 3:3). The entire composites were made with 70% ceramic and 30% wt. PVDF polymer. Line scanning by Scanning electron microscope (SEM) and Atomic force microscopy (AFM) images shows a homogeneous distribution of constituents in the composite film. It is observed that the dielectric permittivity (ε´) follows the MaxwellWagner model. Remnant polarization (P_r) and magnetocapacitance (MC) were found to vary with an applied magnetic field at room temperature. The absolute value of the magnetocapacitance (MC) was found higher for CBT-2 (MC ~ 0.79%) than for CBT-3 (MC ~ 0.57%) but lower than for CPT-3 (MC ~ 1.2%). A linear fit of the MC with M² yields the magnetoelectric quadratic coupling constant |γ| ~ 4.96 × 10^-6 for CBT-1, which is around 150 times lower than for CPT-1 (|γ| ~ 7.92 × 10^-4).