Highly efficient absorber with enhanced magnetoelectric properties based on Y, Gd, and Pr doped NMZ nanoferrites

Abstract

NMZ ferrites doped with rare earth having spinel composition Ni0.5Mn0.3Zn0.2X0.02Fe1.98O4, whereas X = Y, Pr and Gd were synthesized by sol gel auto-ignition method. XRD, FESEM, VSM and VNA were used to determine the phase, microstructural, magnetic and electromagnetic properties of rare earths doped NMZ ferrite. XRD analysis confirms the single phase of the rare earths doped NMZ ferrite. FESEM images shows Pr doped NMZ ferrite has less agglomerations and more porous structure as compared to NMZ and other rare earths doped NMZ ferrites. Magnetic analysis shows the enhancement in saturation magnetization and remanence with the doping of Y, Pr and Gd in NMZ ferrite. Dielectric properties were determined. Gd doped NMZ ferrite depicted higher ac conductivity, dielectric constant and other electromagnetic and related dielectric properties as compared to Pr-NMZ, Y-NMZ and NMZ ferrite. Similarly, Gd- NMZ spinel ferrite depicted maximum M'' to other doping contents (Y, Pr) and pure NMZ ferrite. The high saturation Q-factor of Pure NMZ spinel ferrite NPs, Y- NMZ, Pr-NMZ and Gd-NMZ were observed at 1.57 GHz, 1.58 GHz, 3.65 and 4.01 GHz frequency regions, respectively. NMZ and RE doped NMZ ferrite absorbers with thin substrate as absorber were simulated using FDTD method. The maximum value of absorptivity for Gd-NMZ at 2.4 GHz were noticed from the simulated absorbers. The absorptivity was also increased with the different incident angles. Therefore, Gd doped NMZ are more preferable for absorption devices in high frequency region.