Coercivity and superparamagnetic evolution of high energy ball milled (HEBM) bulk CoFe2O4 material

Moyet, Richard Pérez; Cardona, Yenny; Vargas, Pedro; Silva, Josue; Uwakweh, O. N. C.

doi:10.1016/j.matchar.2010.04.013

Cited by 19 publications

(9 citation statements)

References 24 publications

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“…The decrease in M s may be related with structural defects, or due to the presence of a relatively non-reactive surface layer that has low magnetisation. This could also be due to the evolution of the average residual strain effects [11].…”

Section: Magnetic Propertiesmentioning

confidence: 99%

Synthesis of CoFe2O4 powder via PVA assisted sol–gel process

Sivakumar

Kanagesan

Babu³

et al. 2011

J Mater Sci: Mater Electron

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CoFe 2 O 4 ferrites were synthesized by sol-gel method, having metal nitrates as precursors and PVA as surfactant, followed by a heat treatment at 960°C for 2 h. The ultrafine ferrite powders obtained have been characterized by X-ray diffraction, thermal gravimetry, differential scanning calorimetry and room temperature magnetic measurement studies. The morphology of the powder was identified by high resolution-scanning electron microscopy. X-ray diffraction results indicate that the resultant CoFe 2 O 4 crystallites consist of spinel phase. Significant differences in magnetic properties of CoFe 2 O 4 samples synthesized with various concentrations of PVA were observed. The magnetisation measurements show that when the PVA concentration increased, coercivity initially decreased and then increased where as retentivity and magnetisation decreased. The optimum concentration of PVA for the synthesis of CoFe 2 O 4 ferrites is obtained from this investigation. Obviously this material can be used as an efficient candidate for practical recording purpose.

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Section: Magnetic Propertiesmentioning

confidence: 99%

Synthesis of CoFe2O4 powder via PVA assisted sol–gel process

Sivakumar

Kanagesan

Babu³

et al. 2011

J Mater Sci: Mater Electron

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“…So far, the growing efforts have been devoted to the investigation of nanocomposites of CoFe 2 O 4 /SrFe 12 O 19 [18,19]. Nevertheless, these investigations indicated the presence of impurities such as α-Fe 2 O 3 [19,20], which exhibited a twisted hysteresis loop and an incomplete exchange coupling between the hard and soft phases [9,13]. Furthermore, the presence of incomplete exchange coupling behavior severely leads to the decrease of magnetic properties.…”

Section: Introductionmentioning

confidence: 99%

“…Compared with the former methods, electrospinning has been certified to be a simple, lowcost, and versatile technique capable of generating numerous one-dimensional (1D) nanostructures. As one of the typical 1D nanostructures, nanofibers have high surface-to-volume ratio, high aspect ratio, and big shape anisotropy compared to nanoparticle and bulk [19,20]. Therefore, plenty of interests have been focused on the nanofibers because of their novel properties and potential applications [11,21].…”

Section: Introductionmentioning

confidence: 99%

A novel method to fabricate CoFe2O4/SrFe12O19 composite ferrite nanofibers with enhanced exchange coupling effect

Pan¹,

Cao²,

Jing³

et al. 2016

Nano Online

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Nanocomposite of CoFe 2 O 4 /SrFe 12 O 19 has been synthesized by the electrospinning and calcination process. A novel method that cobalt powder was used to replace traditional cobalt salt in the precursor sol-gel for electrospinning was proposed. The crystal structures, morphologies, and magnetic properties of these samples have been characterized in detail. Moreover, when the average crystallite size of the hard/soft phases reached up to an optimal value, the CoFe 2 O 4 have an enhanced saturation magnetization of 62.8 emu/g and a coercivity of 2,290 Oe. Significantly, the hysteresis loops for the nanocomposites show a single-phase magnetization behavior, and it has been found that the exchange coupling interaction strongly exists in the CoFe 2 O 4 /SrFe 12 O 19 magnetic nanocomposite nanofibers.

show abstract

Section: Introductionmentioning

confidence: 99%

“…Compared with the former methods, electrospinning has been certified to be a simple, low-cost, and versatile technique capable of generating numerous one-dimensional (1D) nanostructures. As one of the typical 1D nanostructures, nanofibers have high surface-to-volume ratio, high aspect ratio, and big shape anisotropy compared to nanoparticle and bulk [19,20]. Therefore, plenty of interests have been focused on the nanofibers because of their novel properties and potential applications [11,21].…”

Section: Introductionmentioning

confidence: 99%

A novel method to fabricate CoFe2O4/SrFe12O19 composite ferrite nanofibers with enhanced exchange coupling effect

et al. 2015

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Nanocomposite of CoFe2O4/SrFe12O19 has been synthesized by the electrospinning and calcination process. A novel method that cobalt powder was used to replace traditional cobalt salt in the precursor sol-gel for electrospinning was proposed. The crystal structures, morphologies, and magnetic properties of these samples have been characterized in detail. Moreover, when the average crystallite size of the hard/soft phases reached up to an optimal value, the CoFe2O4 have an enhanced saturation magnetization of 62.8 emu/g and a coercivity of 2,290 Oe. Significantly, the hysteresis loops for the nanocomposites show a single-phase magnetization behavior, and it has been found that the exchange coupling interaction strongly exists in the CoFe2O4/SrFe12O19 magnetic nanocomposite nanofibers.

show abstract

Coercivity and superparamagnetic evolution of high energy ball milled (HEBM) bulk CoFe2O4 material

Cited by 19 publications

References 24 publications

Synthesis of CoFe2O4 powder via PVA assisted sol–gel process

Synthesis of CoFe2O4 powder via PVA assisted sol–gel process

A novel method to fabricate CoFe2O4/SrFe12O19 composite ferrite nanofibers with enhanced exchange coupling effect

A novel method to fabricate CoFe2O4/SrFe12O19 composite ferrite nanofibers with enhanced exchange coupling effect

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