Display of converse and direct magnetoelectric effect in double perovskite LaYFe2O6

Abstract

This work reports the simultaneous observation of converse magnetoelectric (CME) and direct magnetoelectric (DME) effects in LaYFe2O6. The structural, magnetic, and magnetoelectric properties of LaYFe2O6, prepared by the sol-gel auto-combustion method and sintered at various temperatures, have been studied. The x-ray powder diffraction study suggests the double perovskite structure with symmetries P21nm (∼90%) and Pbnm (∼10%). The alternate ordering of La and Y ions is confirmed by the neutron powder diffraction (ND) study, which also suggests the antiferromagnetic (AFM) ordering of spins. AFM behavior is also manifested by the magnetic field-dependent magnetization (M) measurement. A higher P21nm phase content is desirable in the context of magnetoelectricity. Magnetic transition (∼700 K) is asserted in the temperature-dependent M measurement. The isothermal magnetization study shows weak ferromagnetism probably due to gradually increasing spin canting with temperature until the transition temperature. The highest CME coefficient (∼2.26 mOe cm/V) as well as DME coefficient (∼0.45 mV/cm Oe) in this material are recorded. True magnetoelectricity for temperature as high as 400 K opens up a new avenue on the playground of magnetoelectric (ME)-based applications.

Energy-Harvesting Performance in a LaYFe2O6/P(VDF-HFP) Nanocomposite by Boosting the Magnetoelectric Effect

“…The presence of diffraction peaks at ∼18.40°(orange arrow mark) and ∼20.16°(red arrow mark) validates the presence of a nonpolar alpha phase and a polar beta phase of PVDF, respectively. 25 In the composite films, all of the diffraction peaks of the filler NP 22 (shown in the inset of Figure 1b) are witnessed in the XRD pattern. So, the XRD pattern of the nanocomposites manifests the existence of both a magnetic NP and a piezoelectric polymer.…”

“…The reduction of the ME coupling coefficient in the PS20 and PS30 compositions is ascribed to the enhanced conductivity compared to that of PS10 (see later discussions) and the gradual decrease of the beta phase of PVDF. For comparison, the plot of pristine LO is also displayed, and it exhibits a magnitude of 1 order lower than the film samples (∼0.45 mV cm –1 Oe –1 ) . The inset of Figure a displays the histogram plots of alpha d at 300 K. It is reported that the ME effect in LO strongly depends on the electrical resistivity and the ME coupling coefficient decreases with the temperature as the resistivity decreases .…”

“…Upon further addition of the filler content, i.e., in the PS30 sample, smaller grain sizes with more agglomeration can be observed. For reference, the morphology of the LO NP 22 is shown in the inset of Figure 1a.…”

“…For comparison, the plot of pristine LO is also displayed, and it exhibits a magnitude of 1 order lower than the film samples (∼0.45 mV cm −1 Oe −1 ). 22 The inset of Figure 3a displays the histogram plots of d alpha at 300 It is reported that the ME effect in LO strongly depends on the electrical resistivity and the ME coupling coefficient decreases with the temperature as the resistivity decreases. 22 For the composite film also, the value of d alpha reduces with increasing temperature, which is ascribed to a gradual increase in electrical conduction.…”

“…22 The inset of Figure 3a displays the histogram plots of d alpha at 300 It is reported that the ME effect in LO strongly depends on the electrical resistivity and the ME coupling coefficient decreases with the temperature as the resistivity decreases. 22 For the composite film also, the value of d alpha reduces with increasing temperature, which is ascribed to a gradual increase in electrical conduction. However, the PS10 composite film manifests the higher magnitude of d alpha throughout the temperature window (300−380 K) probably due to better phase-to-phase connectivity resulting in strong interaction between the constituent phases and enhanced electroactive beta phase of PVDF.…”