Papers by Keyword: Magnetodielectric

Abstract: A phenomenological quantization of electromagnetic field is introduced in the presence of the anisotropic magnetodielectric metamaterials. For a single layer structure with the anisotropic metamaterials, input-output relations are derived using the Green-function approach. Based on these relations, the reflectance of the linearly polarized wave through this structure is calculated. The results show different reflectance for different polarized waves and indicate an application of the anisotropic metamaterials to be the reflectors for certain polarized wave. Furthermore it is found that such a structure can realize the resonant gap with the increase of the thickness. Finally the effects of the absorption are considered and we find that the above properties do not change with introduction of the absorption.

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).