Influence of Dysprosium Doping on Structural, Magnetic, and Optical Properties of Ni–Zn Ferrites

Abstract

The spinel ferrites with the compositional formula Ni0.8Zn0.2Fe2−xDyxO4 (x = 0, 0.004, 0.008, 0.012, 0.016) have been prepared using the sol–gel method. The X‐ray diffraction measurements confirm the cubic spinel structure of the sample with a space group of Fd‐3m. Morphological analysis of scanning electron microscope images reveals that the particles are spherical in shape. Energy dispersive X‐ray spectroscopy (EDX) confirms the elemental composition. Thermogravimetric analysis (TGA)/differential scanning calorimetry (DSC) analysis of synthesized dysprosium (Dy) doped Ni–Zn ferrites are carried out from 25 to 700 °C. Fourier‐transform infrared (FTIR) spectroscopy studies reveal the stretching and bending vibrations of the various bonds presented in the compounds. The UV–vis absorption spectrum indicates the energy gap values which small decrease with the Dy concentration increase. Raman spectroscopy reveals the crystal distortion and phases of the samples. The room temperature magnetic measurements (M–H loops) are carried out to study the effect of Dy doping on magnetic properties.

Effect of Zr, Sm and Gd Doped CoFe2O4 on Structural, Spectral and Magnetic Properties

“…The highest intensity peak (311) reflection agrees with the theory that the angle has been generated through a face-centered cubic spinel structure. [34][35][36][37] To estimate the crystallite size, Scherrer's equation has been used.…”

Optical and Magnetic Response of Pure and CU-Ions Substituted Dysprosium Oxide Thin Films for Various Applications

“…For the case of Dy 2 O 3 Figure 5(c) it is clear that dysprosium thin film transforms to paramagnetic nature with an improper saturation of the particles and a much-reduced saturation magnetization value. These results can be used for the tuning of magnetic properties of Dy based thin films for technological applications [15][16][17][18][19][20].…”

“…Brilliant magneto-optical properties are resulted in the case of Copper (Cu) mixed with Manganese (Mn) for example, being Cu as optical and Mn as magnetic material [11]. The value of magnetic anisotropy of Dy is very large which when coupled with transition metals (Fe, Co, Ni, Cu) [12][13][14] and other ferromagnetic rare earths (Er, Ho, Gd) [15][16][17][18][19][20], much attention has been paid to DyFeCo [21], FeNdDyB [22] and FeDyTb alloys [23]. The slight structural changes incorporated because of guest molecules exchange, produce different dipole−dipole interactions which then effect the relaxation rate of incoherent quantum tunneling to acquire different effective relaxation barriers [24].…”

Mechanochemical synthesis of nanostructured and composite oxide ceramics: From mechanisms to tailored properties

“…Nickel–zinc ferrite (Ni–Zn ferrite) exhibits enhanced magnetic properties and high‐frequency characteristics. They are widely used in magnetic recording media, transformers, inductors, and electromagnetic interference shielding materials 193–195 . With the development of synthesis methods, the emergence of nanoscale powders has broadened its application range in devices.…”