Magnetoelectricity in La2NiMnO6 and its PVDF impregnated derivative

Abstract

La2NiMnO6 is prepared for two different sintering time durations: 4 hour (4H) and 24 hour (24H). The magnetization data suggest a double ferromagnetic (FM) transition for 24H, whereas a single FM transition for 4H sample. The 4H sample was found to possess several microscopic pores compared with the 24H sample, and thus, these pores are vacuum impregnated with polyvinylidene fluoride (PVDF). The PVDF in the impregnated sample is found to crystallize in beta phase. The first and second order magnetoelectric coefficients are extracted from the measured data and plotted as a function of temperature. The room temperature region is found to be dominated by the magnetoconductivity/magnetoloss and thus resulting low ME voltage. With lowering of temperature, the situation improves, and for T < 200 K, the loss component becomes negligible so that the true magnetoelectricity is observed. A comparative study on all the three samples (4H, 24H, and 4H + PVDF) shows a significant enhancement in the magnetoelectricity in the 4H + PVDF sample. The highlight of this report is the unique way to arrest the porosity by PVDF impregnation into the pores of La2NiMnO6 so that leakage is minimized.

Manganese substitution induced magnetic transformation and magnetoelectricity in SrFe12O19

“…In this equation, the first and second terms stand for FiM contribution and the last term for paramagnetic contribution. 50–52 where and ; I = 1, 2. Here ( H + H c i ) and ( H − H c i ) are used for fitting the data of two arms (decreasing and increasing field) of M – H loops.…”

“…The 2 β / d contribution to ME is extracted from the data (which may also be having magnetoloss contribution 52,57 ) by fitting it via eqn (6).where, σ / d is related to the magnetoconductivity/magnetoloss effect. The substitution of Mn has increased the σ / d (in mV × cm −1 × Oe −3 ) gradually; at room temperature ∼10 −6 (SrM), 0.01(4) × 10 −3 (SrM3), 0.05(4) × 10 −3 (SrM5), 1.01(3) × 10 −3 (SrM7).…”

“…In this equation, the first and second terms stand for FiM contribution and the last term for paramagnetic contribution. [50][51][52]…”

“…The 2b/d contribution to ME is extracted from the data (which may also be having magnetoloss contribution 52,57 ) by fitting it via eqn (6).…”

Unraveling the Structural, Dielectric, Magnetic, and Optical Characteristics of Nanostructured La2NiMnO6 Double Perovskites

“…(b) and (c) Histograms of the distributions of the length and diameter of the LNMO NRs; Figure S2: Temperature dependent dielectric permittivity ( ε r ) and its reciprocal (1000/ ε r ) of the LNMO ceramics prepared from (a,b) NPs and (c,d) NRs; Figure S3: Plots of as a function of for the LNMO ceramics prepared from NPs measured at (a) 4 kHz, (b) 10 kHz, (c) 80 kHz, and (d) 100 kHz; Figure S4: Plots of as a function of for the LNMO ceramics prepared from NRs measured at (a) 4 kHz, (b) 10 kHz, (c) 80 kHz, and (d) 100 kHz; Table S1: Comparison between the magnetic data and Curie-Weiss fitting parameters of the as-synthesized LNMO samples (nanoparticles (NPs), nanorods (NRs), thin films, and bulk) and that reported in the recent literatures. References [ 83 , 84 ] are cited in Supplementary Materials.…”