Effect of heat treatment on the magnetic and magnetoelastic properties of cobalt ferrite

Nlebedim, Ikenna C.; Ranvah, N.; Williams, P. I.; Melikhov, Yevgen; Snyder, John Evan; Moses, Anthony John; Jiles, David

doi:10.1016/j.jmmm.2010.01.009

Cited by 109 publications

(54 citation statements)

References 17 publications

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“…The first cubic magnetocrystalline anisotropy coefficient was determined by the Law of Approach at 300 K. This showed a decreasing trend as heat treatment temperature increased. 10 The trends observed at lower and higher heat treatment temperatures are comparable to those observed in cation substitutions at lower and higher cation concentrations, respectively. 14,18 The effect of cation substitution in reducing the magnetocrystalline anisotropy is stronger at higher concentrations of substituted cations.…”

Section: Figmentioning

confidence: 57%

“…The effect of heat treatment on the structural properties of the sample at ambient conditions has been previously reported. 10 …”

Section: Methodsmentioning

confidence: 99%

“…9 Hence heat treatment is useful for tailoring the magnetic and magnetostrictive properties. 10 Since any device derived from such heat treated or cation substituted materials would be expected to operate under varying temperature conditions, it is important to understand if, and how temperature variations affect the properties of the materials after chemical substitution or heat treatment. There are reports on the temperature dependence of magnetic properties of chemically modified cobalt ferrite [11][12][13] but the authors are unaware of such studies for heat treated cobalt ferrite.…”

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confidence: 99%

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Temperature dependence of magnetic properties of heat treated cobalt ferrite

Nlebedim¹,

Melikhov²,

Jiles³

2014

Journal of Applied Physics

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This study demonstrates the effectiveness of heat treatment in optimizing the magneticproperties of cobalt ferrite, compared to other methods such as cation substitution. It also shows how the magnetic properties of the heat treated cobalt ferrite vary under differenttemperature conditions. Saturation magnetization increased more due to heat treatment than due to Zn-substitution; a cation substitution that is known to result in high saturationmagnetization in ferrites. A remarkable observation is that the increase in the saturationmagnetization due to heat treatment was not at the expense of Curie temperature as was often reported for cation substituted materials. The observed variations in the magnetic propertieswere explained on the basis of cation redistribution arising as a result of the heat treatment. KeywordsAmes Laboratory, Heat treatments, Ferrites, Cobalt, Saturation moments, Thermal properties Disciplines Electromagnetics and Photonics CommentsThe following article appeared in Journal of Applied Physics 115 (2014) This study demonstrates the effectiveness of heat treatment in optimizing the magnetic properties of cobalt ferrite, compared to other methods such as cation substitution. It also shows how the magnetic properties of the heat treated cobalt ferrite vary under different temperature conditions. Saturation magnetization increased more due to heat treatment than due to Zn-substitution; a cation substitution that is known to result in high saturation magnetization in ferrites. A remarkable observation is that the increase in the saturation magnetization due to heat treatment was not at the expense of Curie temperature as was often reported for cation substituted materials. The observed variations in the magnetic properties were explained on the basis of cation redistribution arising as a result of the heat treatment. V C 2014 AIP Publishing LLC. [http://dx

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Section: Figmentioning

confidence: 57%

“…The effect of heat treatment on the structural properties of the sample at ambient conditions has been previously reported. 10 …”

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

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Temperature dependence of magnetic properties of heat treated cobalt ferrite

Nlebedim¹,

Melikhov²,

Jiles³

2014

Journal of Applied Physics

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“…In contrast, with regard to spin rotation, K1 and λ have a close relation with the chemical composition of ferrite materials [3][4][5], although some studies [6,7] C. We applied the reflow and TC thermal conditions to the samples, and analyzed its inductance response during each part of the TC profile to uncover the contribution of each stage of the thermal treatment profile to the inductance shift.…”

Section: David Publishingmentioning

confidence: 99%

“…Therefore, the increased inductance which could be counteracted by this bias must be sensitive to the magnetic field, that is, some of the increase in inductance after reflow might come from the change in magnetic status. Some studies [6,7] apply treatment temperatures as high as 600 o C ~ 1200 o C, which is high enough to drive the ions to a new site of the spinel. However, the treatment temperature in this work was lower than 300 o C, and there was thus not enough energy to cause redistribution of the ions.…”

Section: Original Inductancementioning

confidence: 99%

A Study of the Thermal Characteristics of NiCuZn Ferrite Chip Inductors

Yin-Lai-Chai¹,

Chien²,

Lee³

et al. 2015

JMSE-B

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Like other electrical components, the characteristics of magnetic components are significantly affected by not only magnetic fields, but also ambient temperature and inner/outer stress. In order to understand the nature of inductance shift of NiCuZn ferrite after thermal treatments, in this work we measured and analyzed the inductance shift of inductors which were treated separately by reflow and temperature cycling conditions. The results reveal that the inductance shift comes from not only residual stress release, which causes an increase in inductance during the cooling stage, but also the change in magnetic status by the peak temperature, which also causes an increase in inductance. Nevertheless, this magnetic status would be affected by the magnetic field to form a remanence that causes a fall in inductance later on, and this remanence level can be reduced under subzero temperature conditions. Comparing the construction of components for multilayer chips made of pure ferrite with those made of wound coil, this complex relation between heat, stress and the magnetic field of chip inductors are caused by the cofiring of ferrite and conductor material during the manufacturing process of chip inductors.

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Microwave‐assisted catalytic activity of superparamagnetic spinel ferrites

Riaz

Ashraf

Aazam³

2021

J of Chemical Tech & Biotech

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BACKGROUND Superparamagnetic spinel ferrites were synthesized through a facile one‐step co‐precipitation technique using carbonate salt as precursor. RESULTS The synthesized ferrite nanoparticles of type MFe2O4 exhibited remarkably high magnetism even under microwave irradiation, which was utilized for the microwave‐assisted degradation of Alizarin Red (AR) dye. The formation of •OH radicals under microwave irradiation was detected by the radical scavenging studies, which suggested that these radicals played an important role in the microwave‐assisted catalytic reaction. CONCLUSION This facile synthetic approach can lead to the design and preparation of microwave‐active magnetic spinels with an excellent ability to remove organic pollutants in wastewater. © 2021 Society of Chemical Industry.

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Effect of heat treatment on the magnetic and magnetoelastic properties of cobalt ferrite

Cited by 109 publications

References 17 publications

Temperature dependence of magnetic properties of heat treated cobalt ferrite

Temperature dependence of magnetic properties of heat treated cobalt ferrite

A Study of the Thermal Characteristics of NiCuZn Ferrite Chip Inductors

Microwave‐assisted catalytic activity of superparamagnetic spinel ferrites

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