Enhancement in the Magnetostriction of Sintered Cobalt Ferrite by Making Self-Composites from Nanocrystalline and Bulk Powders

Mohaideen, K. Khaja; Joy, P.A.

doi:10.1021/am302053q

Cited by 90 publications

(45 citation statements)

References 25 publications

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“…Electronic mail: nlebedim@iastate.edu. the previous study on samples derived from nanoparticles 6 that composite of small and large particles enhance magnetostriction amplitude. Comparing SP6 and SP8 derived from smallest particle sizes (<45 lm) and largest particle sizes (>106 lm), respectively, it is obvious that making samples with large particle size powders reduces the magnetostriction amplitude measured along the parallel direction.…”

Section: Resultsmentioning

confidence: 77%

Dependence of the magnetostrictive properties of cobalt ferrite on the initial powder particle size distribution

Nlebedim

Jiles

2014

Journal of Applied Physics

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The dependence of the magnetostrictive properties of cobalt ferrite on the size distribution of thepowder used in deriving the samples from traditional ceramic approach is presented. Sample obtained by combining the smallest and largest particle size distributions gave the highestmagnetostriction and strain sensitivity (216 ppm and 1.34 nm/A, respectively), for measurementin parallel direction but the least (66 ppm and 0.38 nm/ A respectively) in perpendicular direction. Sample derived from largest particle size distribution gave the least magnetostriction and strain sensitivity (147 ppm and 0.61 nm/A, respectively) in parallel direction but the highest (126 ppm and 0.5 nm/A, respectively) in the perpendicular direction. The dependence of the magnetostrictive properties of cobalt ferrite on the size distribution of the powder used in deriving the samples from traditional ceramic approach is presented. Sample obtained by combining the smallest and largest particle size distributions gave the highest magnetostriction and strain sensitivity (216 ppm and 1.34 nm/A, respectively), for measurement in parallel direction but the least (66 ppm and 0.38 nm/A respectively) in perpendicular direction. Sample derived from largest particle size distribution gave the least magnetostriction and strain sensitivity (147 ppm and 0.61 nm/A, respectively) in parallel direction but the highest (126 ppm and 0.5 nm/A, respectively) in the perpendicular direction. V C 2014 AIP Publishing LLC.

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Section: Resultsmentioning

confidence: 77%

Dependence of the magnetostrictive properties of cobalt ferrite on the initial powder particle size distribution

Nlebedim

Jiles

2014

Journal of Applied Physics

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“…It has been experimentally shown that magnetostrictive properties of materials derived from cobalt ferrite, including the strain derivatives, are dependent on processing conditions. [25][26][27] In another study, 28 it was suggested that an enhancement of $200% in strain sensitivity may be due to non-stoichiometry which can also be related to the processing conditions. Therefore it is important to discuss the effect of Zn-substitution on the strain derivative of the samples with respect to the unsubstituted sample in the present study (i.e., x ¼ 0).…”

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

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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...

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“…The analysis of X-ray powder diffraction data has shown that bismuth manganite ceramics exhibit, at room temperature, two centro-symmetric phases: the BiMn 2 Recently, the novel self-composite term was introduced to describe a material, whose elemental composition is not changed, whereas the local distribution of phases varies [18][19][20]. Therefore, the Bi 12 MnO 20 -BiMn 2 O 5 compound, consisting of two stable phases, can be called a self-composite material.…”

Section: Introductionmentioning

confidence: 99%

Electric relaxation and Mn3+/Mn4+ charge transfer in Fe-doped Bi12MnO20–BiMn2O5 structural self-composite

et al. 2016

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Fe-doped Bi 12 MnO 20 -BiMn 2 O 5 ceramics was sintered at 1130 K for 6 h in ambient air. Two centro-symmetric phases formed thermodynamically stable self-composite material that was deduced from X-ray pattern analysis. The lattice parameters were a = 10.147 (8) sites. The other relaxation occurred in the 170-220 K range, and it exhibited the following values: s 02 = 10 -11 s, and E A,2 = 0.27 eV. A disorder-related VRH polaron model was proposed for q DC (T) and for electric relaxation processes.

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Enhancement in the Magnetostriction of Sintered Cobalt Ferrite by Making Self-Composites from Nanocrystalline and Bulk Powders

Cited by 90 publications

References 25 publications

Dependence of the magnetostrictive properties of cobalt ferrite on the initial powder particle size distribution

Dependence of the magnetostrictive properties of cobalt ferrite on the initial powder particle size distribution

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

Electric relaxation and Mn3+/Mn4+ charge transfer in Fe-doped Bi12MnO20–BiMn2O5 structural self-composite

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