Variation in magnetic and structural properties of Co-doped Ni–Zn ferrite nanoparticles: a different aspect

Abstract

Cobalt-substituted nickel-zinc ferrite nanoparticles (Ni 0.6-x Zn 0.4 Co x Fe 2 O 4 ) (x = 0, 0.0165, 0.033, 0.264 and 0.528) have been synthesized and characterized with respect to their structural and magnetic properties. Exceptionally in spite of the reported literature where the saturation magnetization increases with Co doping that attributes to Co 2? ions distribution in octahedral sites, the saturation magnetization in our samples decreases by increasing Co contents as revealed by vibrating sample magnetometer measurements. To know the structural properties such as phase identification, measurement of crystallite size and other structural parameters, prepared samples have been performed by X-ray diffraction technique. The X-ray diffraction spectra measurements show that samples have single-phase spinel cubic structure at x = 0, 0.033, 0.264 and 0.528, and at x = 0.0165, there is partial formation of hematite phase. The uncommonly decreased saturation magnetization, variation in retentivity, coercivity and magneto-crystalline anisotropy and also variation in structural properties with Co doping are explained on the basis of Co 2? ions distribution in tetrahedral and octahedral sites in place of Ni 2? and Zn 2? ions having different magnetic moments and different ionic radii, respectively. Using transmission electron microscopy, the particles size has been calculated. The morphology and stoichiometry of prepared samples have been investigated by field emission scanning electron microscopy and energy-dispersive X-ray spectroscopy techniques, respectively. The structural and magnetic measurement results are well co-related with each other with respect to Co 2? ions doping and its distributions. The moderate saturation magnetization and low coercivity values of all samples show soft magnetic behavior and attribute the usefulness of these materials in magnetic recording devices. Graphical Abstract

Investigation of structural, electrical, and magnetic variations of Ni-Zn-Co ferrites by substituting rare earth Ho3+ for high-frequency applications

“…52-0277, JCPDS card no. 08-0234 [41][42][43]. The XRD data confirms the formation of a single-phase Ho 3+ substituted NZC ferrite without any unreacted compound or additional phase in the synthesized samples.…”

Review on magnetic spinel ferrite (MFe2O4) nanoparticles: From synthesis to application

“…1 c) is NiFe 2 O 4 where Ni 2+ ions and half of the Fe 3+ ions are in the octahedral sites and the remaining half of the Fe 3+ ions are in the tetrahedral sites [ 23 ]. This implies that the cation distribution between the two interstitial sites may have an impact on the magnetic properties of spinel ferrites [ [24] , [25] , [26] , [27] , [28] , [29] ].…”

Structural and magnetic study of Tb3+ doped zinc ferrite by sol-gel auto-combustion technique

“…Various methods were developed to have different nano-crystalline ZnFe 2 O 4 spinel ferrites like microwave based hydrothermal, decomposition of double layered hydroxide precursor, hydrothermal synthesis, urea combustion, reverse micelle method, dip-coating, solvo-thermal analysis, and co-precipitation [11][12][13][14]. The sol-gel auto combustion method is preferred because of its high degree of compositional homogeneity, low processing temperature, and low cost [15][16][17][18][19][20][21].…”