Phase transitions and magneto-electric properties of 70 wt. % Pb(Fe0.5Nb0.5)O3–30 wt. % Co0.6Zn0.4Fe1.7Mn0.3O4 multiferroic composite

Abstract

Here, we have studied the phase transition and magneto-electric properties of a 70 wt. % Pb(Fe0.5Nb0.5)O3–30 wt. % Co0.6Zn0.4Fe1.7Mn0.3O4 (70 wt. % PFN–30 wt. % CZFMO) multiferroic composite that exhibits a maximum magneto-electric (ME) coefficient of 26.78 mV/cm Oe at room temperature. Raman analysis confirms the formation of composite and development of strain with the shifting of Raman modes. The local symmetry breaking of end members of the composite is observed by the splitting of Raman modes. The first-order derivative of magnetization with temperature (dM/dT vs T) shows anomalies across 140 K due to the PFN phase, whereas the anomaly around 250 K is due to the spin glass transition of the CZFMO phase. The magnetization vs magnetic field (M–H) study at different temperatures reveals the existence of superparamagnetic behavior above 300 K. The temperature-dependent dielectric behavior of the composite shows an anomaly around ferroelectric phase transition (Tm) for the PFN phase along with the broad relaxation peak arising due to the CZFMO phase. The linear behavior of magnetocapacitance (MD%) with the square of magnetization (M2) suggests the existence of biquadratic ME coupling. The ME study on the composite suggests the existence of both direct and converse ME effects.

Effect of nano-size on magnetostriction of BiFeO3 and exceptional magnetoelectric coupling properties of BiFeO3_P(VDF-TrFE) polymer composite films for magnetic field sensor application

“…In the attempt to investigate the coupling between the electric and magnetic order parameters in P(VDF-TrFE) and BFO nanoparticles, the ME coupling of BFO _ P(VDF-TrFE) nanocomposite film was carried out at room temperature using the lock-in amplifier method (supplied by Marine India). In polymer composite systems, the ME coupling arises due to elastic interactions among ferroelectric and magnetic domains via magnetostriction [22,41]. In our case, due to modification in long-range spiral modulated spin structure of BFO nanoparticles lattice strain is developed.…”

Towards room-temperature and above magnetoelectricity in CoFe2O4/Cr2O3 core/shell nanoparticles

“…Nearly unsaturated magnetization behavior is traced for all the samples are mainly due to the disordered spins (of PM shell and at the interface of core/shell) which are difficult to align along the field direction. In order to distinguish (extract) the FM and AFM/PM contributions, the data are fitted via following relation [47],…”