Spin glasslike behavior and magnetic enhancement in nanosized Ni–Zn ferrite system

Ghosh, B.; Kumar, S.; Poddar, A.; Mazumdar, C.; Banerjee, S.; Reddy, V. R.; Gupta, A.

doi:doi:10.1063/1.3456174

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Giant electrorheological effect in Fe₂O₃ nanofluids under low dc electric fields

In this paper, we report the electrorheological (ER) properties of low concentration Fe2O3 nanofluids prepared in ethylene glycol (EG). Spherical Fe2O3 nanoparticles (NPs) were obtained by emulsion method in powder form. The obtained NPs were stabilized in time by acetylacetone in EG. The prepared Fe2O3 NPs were characterized using X-ray diffraction and transmission electron microscopy. Fe2O3 nanofluids were tested for ER behavior at low dc electric fields. Giant ER (GER) effect was observed in...

Defect engineering of the electrochemical characteristics of carbon nanotube varieties

The electrochemical behavior of carbon nanotubes (CNTs) containing both intrinsic and extrinsically introduced defects has been investigated through the study of bamboo and hollow multiwalled CNT morphologies. The controlled addition of argon ions was used for varying the charge and type of extrinsic defects. It was indicated from Raman spectroscopy and voltammetry that the electrocatalytic response of hollow type CNTs could be tailored more significantly, compared to bamboo type CNTs which hav...

The effects of particle size, structure, microstrain, and cation distribution on magnetic property of nanosized Ni_0.35Zn_0.65Fe₂O₄ prepared through high-energy ball milling have been explored by a wide variety of experimental technique namely, x-ray diffraction, high-resolution transmission electron microscopy, dc magnetization measurement, and Mössbauer spectroscopy. The sample exhibits mixed magnetic behavior with a collective magnetic state between 300 and 60 K while spin glasslike freezing of magnetic moments has taken place below 60 K. The sample has displayed enhancement in magnetization, magnetic hyperfine field, coercivity, and anisotropy energy. The inherent superparamagnetic relaxation of ferrite nanoparticles has significantly reduced and it shows evidence of magnetic hysterisis at room temperature. These properties could be profitably used to overcome the inherent instability of magnetic nanoparticles. The intersublattice interaction (J_AB) in the sample has strengthened due to migration of Fe³⁺ ions from octahedral (B) site to tetrahedral (A) site and this accounts for the genesis of counterintuitive magnetic enhancement in the sample.

Article Outline

INTRODUCTION
EXPERIMENT
RESULTS
DISCUSSION
CONCLUSION

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KEYWORDS and PACS

Keywords

ball milling, coercive force, ferrites, hyperfine interactions, magnetic hysteresis, magnetic moments, magnetic particles, magnetisation, Mossbauer effect, nanoparticles, nickel compounds, particle size, spin glasses, superparamagnetism, transmission electron microscopy, X-ray diffraction, zinc compounds

PACS

75.75.-c

Magnetic properties of nanostructures
75.50.Tt

Fine-particle systems; nanocrystalline materials
75.60.Ej

Magnetization curves, hysteresis, Barkhausen and related effects
81.20.Ev

Powder processing: powder metallurgy, compaction, sintering, mechanical alloying, and granulation
75.30.Cr

Saturation moments and magnetic susceptibilities
75.50.Vv

High coercivity materials

ARTICLE DATA

Digital Object Identifier

http://dx.doi.org/10.1063/1.3456174

PUBLICATION DATA

ISSN

0021-8979 (print)

1089-7550 (online)

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American Institute of Physics

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