Influence of vacuum sintering on microstructure and magnetic properties of magnetostrictive cobalt ferrite

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

doi:10.1016/j.jmmm.2009.03.021

Cited by 53 publications

(17 citation statements)

References 20 publications

(26 reference statements)

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“…Microstructure (grain size, grain orientation, porosity) of the sintered cobalt ferrite and its derivatives has significant effect on the magnetic as well as the magnetostrictive properties [6]. Microstructures of the sintered samples can be controlled by changing the synthesis conditions, which affect the morphology as well as the crystallite size of the initial powders [7,8], sintering temperature and time [5,9], heating/cooling rates and sintering atmosphere [10], the pressure applied while making the compacts [11], etc. The desired microstructure of the sintered samples made from powders synthesized by the ceramic method is hard to be controlled, where the initial particles are in the micrometre size region, whereas it could be well controlled in the sintered samples derived from the nanosized particles.…”

Section: Introductionmentioning

confidence: 99%

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

Anantharamaiah

Joy

2015

J Mater Sci

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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.

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Section: Introductionmentioning

confidence: 99%

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

Anantharamaiah

Joy

2015

J Mater Sci

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“…The need to control the magnetostrictive properties has resulted in several studies including the influence of vacuum sintering, 1 annealing and quenching heat treatment, 2 metal bonding, 3 and cation substitutions. [4][5][6][7] Of these, cation substitution has been found very useful for improving the strain response of cobalt ferrite to applied magnetic field.…”

Section: Introductionmentioning

confidence: 99%

Dependence of magnetomechanical performance of CoGaxFe2−xO4 on temperature variation

Nlebedim

Melikhov

Snyder

et al. 2011

Journal of Applied Physics

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Electronic origin of the negligible magnetostriction of an electric steel Fe1-xSix alloy: A density-functional study J. Appl. Phys. 111, 063911 (2012) Modeling plastic deformation effect on magnetization in ferromagnetic materials J. Appl. Phys. 111, 063909 (2012) Magnetic and calorimetric studies of magnetocaloric effect in La0.7-xPrxCa0.3MnO3 J. Appl. Phys. 111, 07D726 (2012) Converse magnetoelectric effect dependence with CoFeB composition in ferromagnetic/piezoelectric composites J. Appl. Phys. 111, 07C725 (2012) A model-assisted technique for characterization of in-plane magnetic anisotropy J. Appl. Phys. 111, 07E344 (2012) Additional information on J. Appl. Phys. The temperature dependence of the magnetoelastic properties of the CoGa x Fe 2Àx O 4 system (for x ¼ 0.0, 0.2, and 0.4) has been studied. It has been shown that increase in temperature resulted in reduced magnetostrictive hysteresis. For both CoGa 0.2 Fe 1.8 O 4 and CoGa 0.4 Fe 1.6 O 4 , the measured magnetostriction amplitudes were higher at 250 K than at 150 K. It was also shown that the temperature stability of magnetostriction in CoGa 0.2 Fe 1.8 O 4 is higher than that of the other compositions studied which is important for sensor applications. The highest strain sensitivity was obtained for CoGa 0.2 Fe 1.8 O 4 at 250 K. Results demonstrate the possibility of tailoring magnetomechanical properties of the material to suit intended applications under varying temperature conditions.

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“…The effect of quenching heat treatments and the influence of vacuum sintering on the magnetostrictive properties of Co-ferrite have been studied [8,9]. Both studies showed degradation of magnetostriction and strain derivative due to cation redistribution and development of additional phase, respectively.…”

Section: Introductionmentioning

confidence: 99%

Dependence of the magnetic and magnetoelastic properties of cobalt ferrite on processing parameters

Nlebedim

Snyder

Moses

et al. 2010

Journal of Magnetism and Magnetic Materials

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Influence of vacuum sintering on microstructure and magnetic properties of magnetostrictive cobalt ferrite

Cited by 53 publications

References 20 publications

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

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

Dependence of magnetomechanical performance of CoGaxFe2−xO4 on temperature variation

Dependence of the magnetic and magnetoelastic properties of cobalt ferrite on processing parameters

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