Room temperature magento-electric coupling in Pb-Zn substituted Co2Y-hexaferrite

Polycrystalline Y-type hexagonal ferrite sample with composition Ba2-xPbx-Co1.5Zn0.5Fe12O22 (0 < x < 0.4) have been prepared via sol-gel auto-combustion method with citric acid as a chelating agent. The synthesized samples were characterized by x-ray diffraction (XRD), scanning electron microscopy (SEM), vibrating sample magnetometry, and P -E loop tracer. Single-phase of Y-type hexaferrite has been confirmed by XRD. The crystalline nature with hexagonal platelet-like morphology was confirmed by structural and morphological analysis. The dielectric constant (epsilon') increases with Pb concentration and maximum dispersion is obtained for x = 0.3 sample. The power law dependence of ac conductivity with exponent (n) value about 0.229 to 0.285, suggests the conduction mechanism via polaron hooping. P-E loop analysis demonstrated the increase in remnant polarization, saturation polarization value with increase of Pb (up to x = 0.2) and shows a decreasing trend for higher Pb content. M-H curves reveal the soft magnetic behavior of the prepared samples. The coercivity (H-c) increases with an increase of Pb content and x = 0.3 sample exhibits the maximum value of coercivity of about similar to 107 Oe. The room temperature magnetoelectric coupling is evidenced with a second-order coupling coefficient (beta) of 4.3 x 10(-6) mu V/cm-Oe(2) for x = 0.3 sample, which endorses this material as a potential candidate for multistate memory devices.

Automated summary

In this study, polycrystalline Y-type hexagonal ferrite samples with composition Ba2-xPbx-Co1.5Zn0.5Fe12O22 (0 < x < 0.4) were successfully prepared by a sol-gel auto-combustion method. The samples were analyzed using various techniques, and the results showed that the samples had a single-phase Y-type hexaferrite structure with a hexagonal platelet-like morphology. The dielectric constant increased with the concentration of Pb, and the coercivity also increased. Furthermore, the samples exhibited magnetoelectric coupling properties.