Structural, magnetic, and magnetoelastic properties of magnesium substituted cobalt ferrite

Nlebedim, Ikenna C.; Hadimani, Ravi L.; Prozorov, Ruslan; Jiles, David

doi:10.1063/1.4798822

Cited by 30 publications

(25 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…9. The strain derivative obtained at x ¼ 0 is lower than that reported for un-substituted cobalt ferrite in previous studies 13,14,24 but comparable to that reported in another study. 7 This may be related to the processing conditions.…”

Section: Magnetostrictive Propertiescontrasting

confidence: 52%

“…Strain derivative is often enhanced at low cation concentration but decreases at higher concentrations. 3,7,13,14 Some exceptions are Ga-substitution 12 for which strain derivative was enhanced at relatively higher Ga concentration (x ¼ 0.4 at 300 K) and Mg-substitution 24 for which strain derivative decreased with Mg substitution. In those studies, Ga and Mg were substituted for Fe.…”

Section: Magnetostrictive Propertiesmentioning

confidence: 99%

See 1 more Smart Citation

Temperature dependence of the structural, magnetic, and magnetostrictive properties of zinc-substituted cobalt ferrite

Nlebedim

Vinitha

Praveen

et al. 2013

Journal of Applied Physics

Self Cite

View full text Add to dashboard Cite

This study presents the effects of substitution of Zn 2+ for Co2+ at low concentrations and the effects of temperature variations on the structural, magnetic, and magnetostrictive properties ofcobalt ferrite. Although the Zn-substituted cobalt ferrite samples, Co1−x Zn xFe2O4 (x = 0.02, 0.04, 0.06, 0.09, and 0.17) did not show observable changes in crystal structure, the magnetic and magnetostrictive properties were strongly affected. The variation in magnetic susceptibilitywith composition can be related to the variations in magnetization, coercive field and magnetocrystalline anisotropy. The changes in coercive field were found to be primarily due to the variations in the magnetocrystalline anisotropy. The effect of magnetocrystalline anisotropyon magnetization was stronger at lower cation concentration than at higher concentrations. The decrease in magnetization around 150 K is attributed to the high magnetocrystalline anisotropyat low temperatures which prevented the maximum applied field of 4 MA/m from causing the saturation of magnetization in the samples. Because the magnetocrystalline anisotropy was determined with the magnetization data using the Law of Approach to saturation magnetization, the reliability of the result was found to decrease with decrease in temperature. Peak-to-peakmagnetostriction amplitude and the strain sensitivity decreased with increase in Znsubstitution. KeywordsAmes Laboratory, Zinc, Magnetic anisotropy, Ferrites, Cobalt, Magnetic fields Disciplines Electromagnetics and Photonics CommentsThe following article appeared in Journal of Applied Physics 113 (2013) This study presents the effects of substitution of Zn 2þ for Co 2þ at low concentrations and the effects of temperature variations on the structural, magnetic, and magnetostrictive properties of cobalt ferrite. Although the Zn-substituted cobalt ferrite samples, Co 1Àx Zn x Fe 2 O 4 (x ¼ 0.02, 0.04, 0.06, 0.09, and 0.17) did not show observable changes in crystal structure, the magnetic and magnetostrictive properties were strongly affected. The variation in magnetic susceptibility with composition can be related to the variations in magnetization, coercive field and magnetocrystalline anisotropy. The changes in coercive field were found to be primarily due to the variations in the magnetocrystalline anisotropy. The effect of magnetocrystalline anisotropy on magnetization was stronger at lower cation concentration than at higher concentrations. The decrease in magnetization around 150 K is attributed to the high magnetocrystalline anisotropy at low temperatures which prevented the maximum applied field of 4 MA/m from causing the saturation of magnetization in the samples. Because the magnetocrystalline anisotropy was determined with the magnetization data using the Law of Approach to saturation magnetization, the reliability of the result was found to decrease with decrease in temperature. Peak-to-peak magnetostriction amplitude and the strain sensitivity decreased with increase in Zn substitution. V C 2013 AIP Publ...

show abstract

Section: Magnetostrictive Propertiescontrasting

confidence: 52%

Section: Magnetostrictive Propertiesmentioning

confidence: 99%

Temperature dependence of the structural, magnetic, and magnetostrictive properties of zinc-substituted cobalt ferrite

Nlebedim

Vinitha

Praveen

et al. 2013

Journal of Applied Physics

Self Cite

View full text Add to dashboard Cite

show abstract

“…and Mg 2? [19,23] in cobalt ferrite reduces the net magnetization of B-site at a greater extent than at the A-site. Therefore, overall magnetization decreases as the substituent concentration increases in the spinel lattice.…”

Section: Magnetic Characterizationmentioning

confidence: 95%

Magnetic and magnetostrictive properties of aluminium substituted cobalt ferrite synthesized by citrate-gel method

Anantharamaiah

Joy

2015

J Mater Sci

View full text Add to dashboard Cite

Structural, magnetic and magnetostrictive properties of sintered aluminium-substituted cobalt ferrite, CoAl x Fe 2-x O 4 (x = 0.0, 0.1, 0.20, 0.30), derived from nanosized powders synthesized by a citrate-gel method, have been investigated. The sample with x = 0.1 is found to exhibit higher maximum magnetostriction strain at relatively lower magnetic fields (230 ppm at 286 kA/m) than that obtained for the unsubstituted cobalt ferrite (217 ppm, at 446 kA/m). All the Al-substituted compositions show larger strain sensitivity (dk/dH) at low magnetic fields compared to that for the unsubstituted cobalt ferrite. The variation of the magnetostriction coefficient as well as the strain sensitivity with Al content is likely to be due to the changes in the cation distribution in the tetrahedral and octahedral sites of the spinel lattice along with the associated changes in the magnetocrystalline anisotropy. The magnetostriction coefficient of x = 0.1 could be further enhanced to 306 ppm (at 220 kA/m) after a magnetic field annealing at 300°C. A very high strain sensitivity of 4.5 9 10 -9 m/A is obtained for the magnetically annealed sample, larger than that reported for any substituted cobalt ferrite samples. The combination of high magnetostriction coefficient and strain sensitivity is suitable for device applications.

show abstract

“…The coercivity increase from 36 to 112 when the crystallite size decreases from 38 to 27 nm. The decrease in coercivity is due to the expected crossover from a single domain to multidomain as particle size increases from 27 to 38nm [33]. The existence of the superparamagnetic behaviour of the synthesised particle is attributed to the finite crystallite size and the shape of the material [34].…”

Section: E Vsm Analysismentioning

confidence: 99%

Microstructural and Magnetic Properties of Cobalt Ferrite Nanoparticles Synthesized by Sol-Gel Technique

Chitra¹,

Raguram²,

Rajni³

2018

IJTSRD

View full text Add to dashboard Cite

Cobalt ferrite (CoFe2O4), an inverse spinal ferrite has high permeability, good saturation 1magnetization and no preferred direction of magnetization, high Curie temperature, and high electromagnetic performance. In the present work 0.2M cobalt nitrate 0.3M ferric nitrate and 0.4 M citric acid is used to synthesis cobalt ferrite nanoparticle by sol technique. As the magnetic property depends on the grain size of the synthesized nanoparticle, metal nitrate to citric acid ratio is varied from 0.8, 0.6 and 0.4 and the structural, functional morphological and magnetic characteristics are analyzed. The structural analysis shows the decrease in the average crystallite from 37 to 27nm when CA/MN ratio decreases from 0.8 to 0.4. The strain is directly proportion dislocation density and it reflects the growth of the average grain size, and in the present study, it reflects the same. The calculated lattice parameter is found to be close to 8.373 Å and the volume of the cell is found to be 5.63x10-28 m is close to the standard value for the cobalt ferrite nanoparticles. From the EDS spectrum, the presence of Co, Fe, and O in the synthesized nanoparticles are noted. Functional groups analysis by FTIR shows the presence of organic sources. Surface morphology by Sc electron microscope shows the distribution of spherical sized nanoparticles agglomerated in different sizes and the grain size calculated by image J software are close to the calculated value by Scherrer formula from XRD.Cobalt ferrite (CoFe2O4), an inverse spinal ferrite has high permeability, good saturation 1magnetization and no preferred direction of magnetization, high Curie temperature, and high electromagnetic performance. In the present work 0.2M cobalt nitrate M ferric nitrate and 0.4 M citric acid is used to synthesis cobalt ferrite nanoparticle by sol-gel technique. As the magnetic property depends on the grain size of the synthesized nanoparticle, metal nitrate to citric acid ratio is varied from 0.8, 0.6 and 0.4 and the structural, functional morphological and magnetic characteristics are analyzed. The structural analysis shows the decrease in the average crystallite from 37 to 27nm when CA/MN ratio decreases from 0.8 to 0.4. The strain is directly proportional to dislocation density and it reflects the growth of the average grain size, and in the present study, it reflects the same. The calculated lattice parameter is found to and the volume of the cell is found to the standard value for the cobalt ferrite nanoparticles. From the EDS spectrum, the presence of Co, Fe, and O in the synthesized nanoparticles are noted. Functional groups analysis by FTIR shows the presence of organic sources. Surface morphology by Scanning electron microscope shows the distribution of spherical sized nanoparticles agglomerated in different sizes and the grain size calculated by image J software are close to the calculated value by Scherrer RD, FTIR, SEM, VSM I.

show abstract

Structural, magnetic, and magnetoelastic properties of magnesium substituted cobalt ferrite

Cited by 30 publications

References 7 publications

Temperature dependence of the structural, magnetic, and magnetostrictive properties of zinc-substituted cobalt ferrite

Temperature dependence of the structural, magnetic, and magnetostrictive properties of zinc-substituted cobalt ferrite

Magnetic and magnetostrictive properties of aluminium substituted cobalt ferrite synthesized by citrate-gel method

Microstructural and Magnetic Properties of Cobalt Ferrite Nanoparticles Synthesized by Sol-Gel Technique

Contact Info

Product

Resources

About