Anisotropy and domain state dependent enhancement of single domain ferrimagnetism in cobalt substituted Ni–Zn ferrites

Gawas, Satu G.; Meena, Sher Singh; Yusuf, S. M.; Verenkar, V. M. S.

doi:10.1039/c6nj02121b

Cited by 23 publications

(2 citation statements)

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“…The FC-ZFC curves displayed an appreciable extent of bifurcation, higher χ M values for FC measurements may be attributed to the spin alignment of the unpaired electrons with respect to the applied field (100 Oe) while in the case of ZFC, the lower observed χ M values may be furnished to the randomization of the unpaired electron spins in the absence of an applied field. [54][55][56][57][58][59][60] Hence, the plot of variation of χ M T with temperature revealed a typical paramagnetic behaviour (Figure 2b), which lies in accordance with the single crystal data discussed in the later section on crystallographic analysis (vide infra). The effective magnetic moment (μ eff ) at room temperature (298 K) was calculated from χ M vs T plot and was found to be ∼ 3.98 BM.…”

Section: Magnetic and Electrochemical Investigationssupporting

confidence: 85%

A Water‐Rich Cobalt(II) Compound: Hydrothermal Synthesis, Spectroscopic, Thermal, Crystal Structure Characterization and Antimicrobial Properties

et al. 2021

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A water‐rich mononuclear Co(II) compound, tris‐(1,10‐phenanthroline) cobalt(II) 1,4‐phenylenediacrylate tetradecahydrate, [Co(phen)3](ppda) ⋅ 14H2O (1) (where phen is 1,10‐phenanthroline; ppda is p‐phenylenediacrylate) was prepared and characterized by elemental analyses, IR, Raman, UV‐Vis, fluorescence spectra, magnetic studies, cyclic voltammetry, single crystal X‐ray diffractometry and TG‐DTA. The Co(II) ion in 1 is high spin (S=3/2) with μB= ∼3.98 B.M. and exhibits a reversible one electron CoII/CoIII redox behavior. 1 crystallizes in a monoclinic centrosymmetric C2/c space group with unit cell parameters; a=23.1019(13), b=12.1077(5) and c=19.7428(1) Å; β=111.410(2)°. The Co(II) ion is coordinated to three phen ligands to form [Co(phen)3]2+ cation. The (ppda)2− dianion and fourteen water molecules form a heterocyclic water cluster through O−H⋅⋅⋅O (ppda)2− and O−H⋅⋅⋅O (H2O) interactions while phen ligands on adjacent cations are stacked via π‐π interactions. On heating compound 1 loses its fourteen water molecules upto 132 °C. 1 is a potent inhibitor for Gram Negative E. coli as compared to Gram Positive S. aureus.

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Section: Magnetic and Electrochemical Investigationssupporting

confidence: 85%

A Water‐Rich Cobalt(II) Compound: Hydrothermal Synthesis, Spectroscopic, Thermal, Crystal Structure Characterization and Antimicrobial Properties

et al. 2021

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“…Due to high permeability, saturation magnetization and low coercivity, rare-earth-doped ferrites are promising candidates for numerous microwave applications, such as circulators, phase shifters, isolators, power transformations, memory core devices, antennas and highspeed digital tapes, high-density data storage devices, catalysts, magnetic liquids and microwave absorbers [9][10][11]. As a token of interest, we consider the rare-earth-doped Co-Ni mixed ferrite system to obtain new results relevant for technological applications [12]. The Lanthanum series (rare-earth elements: La, Sm, Gd, Dy, Yb, Er, Tb, Ce and Y)-doped ferrites show significant perturbations in structural distortions and electrical and magnetic properties [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Effect of Ce3+ Ion on Structural and Hyperfine Interaction Studies of Co0.5Ni0.5Fe2−xCexO4 Ferrites: Useful for Permanent Magnet Applications

Srinivasamurthy

Angadi

Кубрин

et al. 2018

J Supercond Nov Magn

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Nanoparticles of Co 0.5 Ni 0.5 Fe 2−x Ce x O 4 (where x = 0.0, 0.01, 0.015 and 0.02) ferrites are prepared by the modified solution combustion method using a mixture of fuels and are characterized to understand their structural, microstructural and magnetic properties. The X-ray diffraction is used to confirm the formation of a single-phase cubic spinel structure. The average crystallite sizes are calculated using the Scherrer formula and are found to be less than 50 nm. The microstructural features are obtained by the scanning electron microscopy, and the compositional analysis is done by using the energydispersive spectroscopy. The transmission electron microscopy (TEM) investigations show that the synthesized ferrites are made up of very fine spherical nanoparticles. The influence of a rare-earth element (Ce 3+) on the magnetic properties of the samples was studied using the Mössbauer spectroscopy. The Mössbauer spectroscopy reveals the formation of broadened Zeeman lines and quadrupole-split lines and the presence of the Fe 3+ charge state at B sites in the samples. The quadrupole splitting shows that the orientation of the magnetic hyperfine field with respect to the principle axes of the electric field gradient was random. The magnetic hyperfine field values indicate that the A sites have more A-O-B superexchange interactions than the B sites. The coexistence of magnetic sextet and a doublet component on the room-temperature spectra suggests superparamagnetic properties of the nanoparticles. The low-temperature (15 K) Mössbauer spectroscopy explores the paramagnetic relaxation in the nanoparticles. The area under the sextet refers to Fe 3+ concentrations in the tetrahedral and octahedral sites of the ferrite. This study confirms that the Ce 3+ substitution of Fe 3+ only for octahedron sites causes the decrease in Fe-O-Fe arrangement. The effect of Ce 3+ doping on the magnetic properties of Co 0.5 Ni 0.5 Fe 2 O 4 is examined from the vibrating sample magnetometry (VSM) spectra. Saturation magnetization values are decreased initially and then increased, as result of Ce 3+ doping. This can be explained by Neel's two-sub-lattice model. Further, the value of coercivity is found to be increasing with increasing Ce 3+ concentration. The obtained results of M-H loop with improved coercivity (from 851 to 1039 Oe) by Ce 3+ doping of Co 0.5 Ni 0.5 Fe 2 O 4 demonstrate the usefulness for permanent magnet applications.

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Spinel Ferrite Nanoparticles: Synthesis, Crystal Structure, Properties, and Perspective Applications

Tatarchuk

Bououdina

Vijaya³

et al. 2017

Springer Proceedings in Physics

162

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Anisotropy and domain state dependent enhancement of single domain ferrimagnetism in cobalt substituted Ni–Zn ferrites

Abstract: Reluctance and favorable orientation of magnetic domain with the field at RT and blocking temperature (TB), respectively, as an effect of enhanced magnetic anisotropy by virtue of Co substitution.

Cited by 23 publications

References 50 publications

A Water‐Rich Cobalt(II) Compound: Hydrothermal Synthesis, Spectroscopic, Thermal, Crystal Structure Characterization and Antimicrobial Properties

A Water‐Rich Cobalt(II) Compound: Hydrothermal Synthesis, Spectroscopic, Thermal, Crystal Structure Characterization and Antimicrobial Properties

Effect of Ce3+ Ion on Structural and Hyperfine Interaction Studies of Co0.5Ni0.5Fe2−xCexO4 Ferrites: Useful for Permanent Magnet Applications

Spinel Ferrite Nanoparticles: Synthesis, Crystal Structure, Properties, and Perspective Applications

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