Magnetic properties of ultrafine particles and bulk material of cadmium ferrite

Yokoyama, M.; Ohta, Eiji; Sato, Tetsuya

doi:10.1016/s0304-8853(97)01073-1

Cited by 53 publications

(21 citation statements)

References 14 publications

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“…The number of clusters increases with decreasing particle size which eventually leads to increase in magnetization. Similar changes in magnetic properties with size were also observed in ultra fine cadmium ferrite synthesized by co-precipitation and high energy ball milled (HEMB) techniques (Yokoyama et al 1996(Yokoyama et al , 1998Chinnasamy et al 2001;Mahmoud et al 2003;Elkins et al 2005).…”

Section: Introductionsupporting

confidence: 57%

“…This enhanced occupancy of Fe 3+ ions in CdFe 2 O 4 compared to ZnFe 2 O 4 (14%) is explained by considering higher octahedral preferential energy of Cd 2+ (-29⋅1 kcal/mol) ions to that of Zn 2+ ions (-31⋅6 kcal/mol). They have further observed that even the CdFe 2 O 4 prepared by ceramic technique exhibits ferromagnetic ordering at room temperature (Yokoyama et al 1998). Two different types of spin structure were suggested to explain these observed properties, i.e.…”

Section: Introductionmentioning

confidence: 96%

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Bulk magnetic properties of CdFe2O4 in nano-regime

et al. 2007

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Cadmium ferrite particles have been synthesized using co-precipitation technique followed by a low temperature (600°C) annealing in a time scale much shorter than reported in literature. Incorporation of sodium chloride during annealing helps to form a single phase spinel structure with a final particle size of around 50 nm. Even at such a short length scale we observe the overall magnetic properties to be similar to those of the bulk. The observed magnetic properties can be explained on the basis of an anti-ferromagnetic core with a shell containing 'ferromagnetic-like', but canted spin structure.

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Section: Introductionsupporting

confidence: 57%

Section: Introductionmentioning

confidence: 96%

Bulk magnetic properties of CdFe2O4 in nano-regime

et al. 2007

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“…The anisotropy constant (K) of the nanocrystalline materials can incorporate different contributions from magnetocrystalline shape and surface anisotropy [26,40]. Thus, assuming that the magnetocrystalline anisotropy of the Fe 3 O 4 nanoparticles prepared in the polyol media is invariant to the reaction conditions (the nature of the solvent, the heating time) and the shape of the nanoparticles does not change significantly with their size, the variation trend in K can be ascribed to the concurrent effect of the interparticle interactions [41] and the surface anisotropy [40]. Specifically, the decrease in size of the Fe 3 O 4 nanoparticles results in an increased surface spin disorder due to a higher fraction of superficial iron ions with incomplete coordination environments and broken bonds [27].…”

Section: Resultsmentioning

confidence: 99%

Magnetic properties of variable-sized Fe₃O₄nanoparticles synthesized from non-aqueous homogeneous solutions of polyols

Caruntu

O’Connor

2007

J. Phys. D: Appl. Phys.

301

203

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The magnetic behaviour of well-dispersed monodisperse Fe 3 O 4 nanoparticles with sizes varying between 6.6 and 17.8 nm prepared in a non-aqueous medium was investigated. The smaller nanocrystals exhibit superparamagnetism with the blocking temperatures increasing with the particle size, whereas the biggest particles are ferromagnetic at room temperature. The saturation magnetization values are slightly smaller than that of the bulk material, suggesting the existence of a disordered spin configuration on their surface. The thickness of the magnetically inert shell was estimated from the size variation of the magnetization at 1.9 Å. The dipole-dipole interactions between the particles were tuned by changing the interparticle distances, e.g. by diluting the nanopowders in a non-magnetic matrix at concentrations ranging from 0.25 to 100 wt%. As the strength of the interactions is decreased with dilution, the energy barrier is substantially lowered; this will induce a drastic decrease of both the blocking temperatures and the coercivity with decreasing concentration of the nanoparticles.

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“…Spinel CdFe 2 O 4 is found to be interesting to study the effect of grain size on structural and magnetic properties. Cadmium ferrite is normal spinel with Cd 2+ ions only on the A-sites and Fe 3+ ions only on the B-sites and characterizes ordered antiferromagnetic below 12 K [3][4]. Recently, many researchers have studied the effect of grain size on structural and magnetic properties of CdFe 2 O 4 [5][6].…”

Section: Introductionmentioning

confidence: 99%

Influence of rare-earth ions on structural and magnetic properties of CdFe2O4 ferrites

Gadkari¹,

Shinde²,

Vasambekar

2010

Rare Metals

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Nano-sized powders of rare-earth ions added CdFe 2 O 4 ferrites were synthesized by oxalate co-precipitation method. The influence of R ions (R = Sm 3+ , Y 3+ , and La 3+ ) on the microstructure and magnetic properties of CdFe 2 O 4 ferrites was studied. XRD, SEM, FTIR, and magnetic hysteresis loops were used for analyzing the samples. The addition of R ions alters the structure of the powders and decreases the crystalline size, lattice constant, and grain size. The magnetic properties such as saturation magnetization, remanent magnetization, and magnetic moment increased due to addition of rare-earth ions in CdFe 2 O 4 ferrite. The formation of secondary phase on the grain boundaries supports the abnormal growth. FTIR spectra show two absorption bands. Results suggest that the magnetic properties depend on the particular method of preparation and additives.

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Magnetic properties of ultrafine particles and bulk material of cadmium ferrite

Cited by 53 publications

References 14 publications

Bulk magnetic properties of CdFe2O4 in nano-regime

Bulk magnetic properties of CdFe2O4 in nano-regime

Magnetic properties of variable-sized Fe₃O₄nanoparticles synthesized from non-aqueous homogeneous solutions of polyols

Influence of rare-earth ions on structural and magnetic properties of CdFe2O4 ferrites

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Magnetic properties of ultrafine particles and bulk material of cadmium ferrite

Cited by 53 publications

References 14 publications

Bulk magnetic properties of CdFe2O4 in nano-regime

Bulk magnetic properties of CdFe2O4 in nano-regime

Magnetic properties of variable-sized Fe3O4nanoparticles synthesized from non-aqueous homogeneous solutions of polyols

Influence of rare-earth ions on structural and magnetic properties of CdFe2O4 ferrites

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Magnetic properties of variable-sized Fe₃O₄nanoparticles synthesized from non-aqueous homogeneous solutions of polyols