Magnetoelectric properties of PbZr0.53Ti0.47O3–Ni0.65Zn0.35Fe2O4 multiferroic nanocomposites

Abstract

A different kind of multiferroics with ferroelectric-ferrimagnetic (FE-FM) composites: (1 -x) PbZr 0.53 Ti 0.47 O 3 -x Ni 0.65 Zn 0.35 Fe 2 O 4 with x = 0.10, 0.20 and 0.30, were synthesized by a powder-in-sol precursor hybrid processing route. Structural analysis with X-ray diffraction (XRD) data revealed the presence of both PbZr 0.53 Ti 0.47 O 3 (PZT) and Ni 0.65 Zn 0.35 Fe 2 O 4 (NZFO) pure phases in the PZT-NZFO composites. Scanning electron micrographs (SEM) clearly disclose distribution of both PZT and NZFO phases throughout the sample.Dielectric and electrical properties of the system have been investigated in a wide range of frequency at different temperatures. Dielectric constant (e r ) as a function of temperature reveals the paraelectric-FE transition temperature at *408°C having maximum value of e r at the peak [e r max = 1,200] with another low temperature anomaly at *297°C, very close to the magnetic Curie temperature of the NZFO ferrite (T c = 300°C) for the x = 0.1 FE-FM composite. The impedance spectroscopy data of these composites show clearly, contribution of both grain and grain boundary effect in the electrical properties of the composites. Negative temperature coefficient of resistance (NTCR) behavior of the materials indicates their semiconducting nature. The ac conductivity spectrum is found to obey Johnscher's power law very well. The temperaturedependent magnetization hysteresis (M-H) loops of the PZT/NZFO composite show excellent non-saturating ferrimagnetic behavior with increase in both coercive field (H c ) and remanent magnetization (M r ) when the NZFO content in the composite is increased. Polarization (P) versus electric field (E) studies at 300 K give conclusive evidence of the presence of spontaneous polarization in all the three composites (x = 0.1, 0.2 and 0.3). However, area of P-E loop, coercive field (E c ) and remanent polarization (P r ) are found to decrease noticeably with the increase of the NZFO content (x) in these composites.

Unravelling the nature of magneto-electric coupling in room temperature multiferroic particulate (PbFe0.5Nb0.5O3)–(Co0.6Zn0.4Fe1.7Mn0.3O4) composites

“…Powder-in-sol precursor hybrid processing route is known to be one of the good synthesis techniques to address the aforementioned problems 15,25 . This processing route combines the advantageous properties of solid-state reaction such as high crystallinity, high performance along with fine grain and low sintering temperature of the sol-gel method 15,25 . The multiferroic PFN was prepared using solid-state reaction route, whereas ferrite phase CZFMO was prepared using the sol-gel method.…”

Studies of Phase Transitions and Magnetoelectric Coupling in PFN-CZFO Multiferroic Composites

“…Several studies have been made to observe higher polarization and magnetization along with higher critical temperature (both ferroelectric and magnetic) above room temperature and to achieve higher effective magnetoelectric coupling for various composite systems. − But the studies of both ferroelectric and magnetic transitions with clear evidence of intrinsic (bulk, rather than interfacial) magnetoelectric coupling along with the nature of such ME coupling at room temperature are limited.…”

Structural, Magnetic, Dielectric and Energy Storage Analysis of CoFe2O4@BaTiO3 and BaTiO3@CoFe2O4 Core-Shell Nano- Composites

“…In the last two decades, most of the work have been accomplished to remove the drawbacks of single-phase multiferroic materials. Earlier studies show that composite of multiphase multiferroics possesses high magnetoelectric coupling (ME) coe cients having large values of magnetization and polarization than single phase multiferroic materials [7][8][9]. ME coupling in composites occurs at the boundary of magnetic and ferroelectric phases.…”