Resistivity Enhancement of Sr-Hexaferrite Using Rare Earth Dopant to Minimize Energy Losses

Abstract

Strontium hexaferrite is a material of choice due its various magnetic applications. Energy losses are a prominent issue in these magnetic materials. To lower these energy losses, we need to improve the resistivity by reducing eddy current losses. In this work nanoparticles of Gadolinium (Gd) doped Sr-hexaferrite (SrFe12-xGdxO19 x =0 .0, 0.1) have been synthesized by co-precipitation method. Structural analysis was done by using X-ray diffraction technique (XRD). It was found that the formation of single phase i.e. hexagonal structure has been achieved when the samples were sintered at 920°C for 20 minutes. AC electrical properties such as conductivity (𝜎ac), dielectric constant (ε′), dielectric loss (tanδ) and impedance (Z); real (Z') and imaginary (Z") parts have been studied as a function of frequency at room temperature. Aim of the work was to enhance the resistivity and was successfully achieved. Gd doped sample is proposed as an energy efficient material to be used in devices working at high frequencies.

Gd impurity effect on the magnetic and electronic properties of hexagonal Sr ferrites: A case study by DFT

“…Doping elements such as Ce, Zn, Mn, Sm, Co, Yb, and Gd has been carried out, in each of which the effects of the doped element on the magnetic behavior and electrical properties of the structure have been studied. [16][17][18] Studies on garnet and perovskites and other magnetic nano-particles have also shown that doping the above elements has a significant effect on their thermal stability, crystallization, physical, magnetic, and optical properties. [19][20][21][22] The carrier doping positive effects on the magnetic properties of defective graphene have been detected.…”