Control of Coercivity and Magnetic Anisotropy Through Cobalt Substitution in Ni-Zn Ferrite

Chintala, J. N. Pavan Kumar; Varma, M. Chaitanya; Choudary, G. S. V. R. K.; Rao, K. H.

doi:10.1007/s10948-021-05965-0

Cited by 6 publications

(4 citation statements)

References 65 publications

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“…In the same context, Yu et al reported experimental results demonstrating a direct relationship between an increase in Hc and the appearance of grain boundaries, precipitation, and disorderly processes [ 46 ]. Surface anisotropy could be another factor contributing to enhanced Hc [ 47 , 48 , 49 ]. The latter phenomenon could have its origin in the exchange connections between the spins of the surface and core atoms [ 47 , 48 , 49 , 50 ].…”

Section: Resultsmentioning

confidence: 99%

“…Surface anisotropy could be another factor contributing to enhanced Hc [ 47 , 48 , 49 ]. The latter phenomenon could have its origin in the exchange connections between the spins of the surface and core atoms [ 47 , 48 , 49 , 50 ]. Surface anisotropy becomes more significant as the particle size is reduced to the nanometric interval because of the increased surface/volume ratio [ 51 , 52 ].…”

Section: Resultsmentioning

confidence: 99%

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Properties of High-Entropy Fe30Co20Ni20Mn20Al10 Alloy Produced by High-Energy Ball Milling

Ammar,

Khitouni,

Mbarek

et al. 2023

Materials

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A high-entropy Fe30Co20Ni20Mn20Al10 (at%) alloy with a face-centered cubic (FCC) crystalline phase was produced through mechanical alloying. This study examined the development of its phases, microstructure, morphology, and magnetic characteristics. Scanning electron microscopy (SEM) was applied to assess the sample morphology in relation to milling times. The changes that the material underwent during milling were investigated using X-ray diffraction. The milling time affected the phase transformation. A single FCC solid solution (crystallite size = 12 nm) was found after 50 h of milling. Additionally, the magnetic characteristics were examined and shown to be associated with microstructural changes. The powder mixture exhibited behavior consistent with soft magnetics, with an Hc value of 8 Am−1 and an Ms value of 165 emu/g. The excellent soft magnetic characteristic may be related to the stability of the FCC phase, which was generated following a 30 h milling process. In addition, the low value of Ms may have originated from the presence of Al atoms in the solid solution and the development of large densities of interfaces and crystal defects.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Properties of High-Entropy Fe30Co20Ni20Mn20Al10 Alloy Produced by High-Energy Ball Milling

Ammar,

Khitouni,

Mbarek

et al. 2023

Materials

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“…Substitution of zinc with magnesium also increased the specific absorption rate (SAR), achieving a stable temperature of 44.7 °C for x = 0.3 in MgxZn0.8-xCo0.2Fe2O4. Cobalt substitution of nickel in Ni-Zn ferrites enables control of coercitivity and magnetic anisotropy [48].…”

Section: Doping and Substitution With Metal Ionsmentioning

confidence: 99%

Magnetic Spinel Ferrite Nanoparticles: From Synthesis to Biomedical Applications

Nikolic¹

2023

Magnetic Nanoparticles for Biomedical Applications

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Spinel ferrites are a widely investigated and applied class of materials with a cubic spinel lattice structure. Their unique multifunctional properties (magnetic characteristics, tunable shape/size, large number of active surface sites, high values of specific surface area, good chemical stability, and possibilities for enhancing properties through surface modification) influenced by the synthesis procedure make them attractive for biomedical applications as magnetic nanoparticles in drug delivery to a set target, magnetic hyperthermia, tissue engineering, magnetic extraction of biological components and magnetic diagnostics. In this review, we give an overview of up-to-date synthesis procedures for obtaining magnetic spinel nanoparticles and nanocomposites with optimal properties for biomedical applications.

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“…Thanks to their high electrical resistivity and electrochemical stability, catalytic and magnetic behavior, the nickel ferrites found their use in photoelectric devices, catalysis, sensors and nano-devices [9,10]. Some of these properties can be further improved by the replacement of Ni 2+ ions with divalent cations, or with the substitution of Fe 3+ with trivalent cations [11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Impedance and Dielectric Analysis of Nickel Ferrites: Revealing the Role of the Constant Phase Element and Yttrium Doping

Šiljegović,

Cvejić,

Jankov

et al. 2024

Electronics

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This paper presents the analysis of electrical and dielectric properties of the yttrium-doped nickel ferrite nano-powders synthesized using the co-precipitation method. Impedance and dielectric measurements have been carried out as a function of frequency at different temperatures from 200 to 25 °C in the range of 0.1 kHz–1 MHz. In order to investigate the conduction mechanism and highlight the role of yttrium doping in different concentrations, impedance spectroscopy was employed. The obtained data were analyzed in terms of equivalent circuits made of resistor and capacitor components describing the contributions from different electrical active regions in a material. Further, this study highlights the importance of a single constant phase element (CPE) in the description of dispersion behavior of the impedance response of the investigated samples in the given frequency range. The use of this technique enabled the characterization of grain and grain boundaries contribution in overall conductivity mechanism. The dielectric dispersion nature of all investigated materials is reflected in this study. Very high values of the real part of permittivity at low frequencies are assigned to space-charge polarization. The dependence of the real part of dielectric permittivity values of the yttrium content was also discussed. Doping with yttrium in different concentrations that reflects in different electric and dielectric responses is concluded in this study. The greatest change is noticed for the sample with the minimum dopant content for a x = 0.05 atomic percent share of yttrium. To reveal the potential role of more than one ion contribution to the overall relaxation process in investigated compounds, a modified Debye’s equation was utilized.

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Control of Coercivity and Magnetic Anisotropy Through Cobalt Substitution in Ni-Zn Ferrite

Cited by 6 publications

References 65 publications

Properties of High-Entropy Fe30Co20Ni20Mn20Al10 Alloy Produced by High-Energy Ball Milling

Properties of High-Entropy Fe30Co20Ni20Mn20Al10 Alloy Produced by High-Energy Ball Milling

Magnetic Spinel Ferrite Nanoparticles: From Synthesis to Biomedical Applications

Impedance and Dielectric Analysis of Nickel Ferrites: Revealing the Role of the Constant Phase Element and Yttrium Doping

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