${\mathrm{CoFe}}_{2}{\mathrm{O}}_{4}$ and ${\mathrm{NiFe}}_{2}{\mathrm{O}}_{4}$ are well-known insulating ferrimagnetic spinel ferrites with high Curie temperatures, an important characteristic for electronic spintronic applications. We used first-principles calculations to investigate how their magnetic properties can be altered or tuned by the presence of structural point defects. considered ...

Monodisperse nonstoichiometric zinc ferrite nanoparticles with a tunable size of 4.1–32.2 nm are fabricated via thermal decomposition. An extrinsic impurity phase the ZnO component is present in <10 nm, but this can be eliminated after air annealing treatment. The atom ratio Zn/Fe and concentration oxygen vacancies decrease as particle increases, causing magnetic transition from superparamagnet...

Abstract The effect of sintering temperatures ( T s ) on the structural and magnetic properties Ni 0.6 Zn 0.4 Fe 2 O 4 (NZFO) ferrites synthesized by conventional double method has been reported. samples are sintered at 1200, 1250 1300 °C. X-ray diffraction (XRD) analysis reveals formation a single phase cubic spinel structure sample. parameters such as saturation magnetization, M ; coercive fi...

Spinel ferrites nanomaterials are magnetic semiconductors with excellent chemical, magnetic, electrical, and optical properties which have rendered the materials useful in many technological driven applications such as solar hydrogen production, data storage, sensing, converters, inductors, spintronics, catalysts. The surface area of these contributes significantly to their targeted well observ...

The Poisson’s ratio, bulk modulus, Young’s modulus and of rigidity are the elastic moduli that frequently employed in engineering practice. In industrial world, data utilised to assess material strength. When considering polycrystalline (such as spinel ferrites, superconduc- tors, perovskites garnets) expose mechanical stresses, information material’s magnetic, electric, dielectric properties a...

The spinel ferrite system Ni1-xZnxFe2O4 (x=0-0.7, Δx=0.1) was prepared by wet chemical co-precipitation method using sulfates of respective metal ions. electrical resistivity and dielectric properties the samples have been studied as a function temperature, frequency, Zn content (x). DC (ϱ) measured in temperature range 300 to 800 K. curves so plotted show two phases viz. ferrimagnetic paramagn...

The magnetoelectric effect that occurs in multiferroic materials is fully described by the magnetoelectric coupling coefficient induced either electrically or magnetically. This is rather well understood in bulk multiferroics, but it is not known whether the magnetoelectric coupling properties are retained at nanometre length scales in nanostructured multiferroics. The main challenges are relat...

NiFe(2)O(4) multi-particle-chain nanofibres have been successfully fabricated using electrospinning followed by calcination, and their morphology, chemistry and crystal structure were characterized at the nanoscale. Individual NiFe(2)O(4) nanofibres were found to consist of many nanocrystallites stacked along the nanofibre axis. Chemical analysis shows that the atomic ratio of Ni : Fe is 1 : 2,...

Structural and magnetic properties of Cu 2+ substituted Ni0.8-xCuxZn0.2Fe2O4 ferrites for x = 0.0 to 0.6 with the step increment of 0.2 prepared by an auto-combustion method have been investigated. The X-ray diffraction pattern of these compositions confirmed the formation of the single phase spinel structure. Further, the XRD have been used to calculate the lattice parameter and grain size. Th...