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

Pan L, Cao D, Jing P, Wang J, Liu Q - Nanoscale Res Lett (2015)

Bottom Line: Nanocomposite of CoFe2O4/SrFe12O19 has been synthesized by the electrospinning and calcination process.The crystal structures, morphologies, and magnetic properties of these samples have been characterized in detail.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.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory for Magnetic and Magnetic Materials of the Ministry of Education, Lanzhou University, Lanzhou, 730000 People's Republic of China.

ABSTRACT
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.

No MeSH data available.


Related in: MedlinePlus

SEM images of CoFe2O4/SrFe12O19nanofibers with different Co/Sr2+molar ratios: (a) 8.0, (b) 5.0, (c) 3.0, (d) 1.8, and (e) 0.8.
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Fig2: SEM images of CoFe2O4/SrFe12O19nanofibers with different Co/Sr2+molar ratios: (a) 8.0, (b) 5.0, (c) 3.0, (d) 1.8, and (e) 0.8.

Mentions: As shown in Figure 2, SEM images clearly exhibit the morphologies of CoFe2O4/SrFe12O19 nanofibers with different Co/Sr2+ molar ratios (8.0, 5.0, 3.0, 1.8, and 0.8). Continuously linear structure and uniform diameter can be seen in all annealed nanofibers after the PVP was removed. And the diameter of these nanofibers ranged from 200 to 350 nm. When the Co/Sr2+ molar ratio is higher than 5.0, the nanofiber surface is smooth in Figure 2a,b. Decreasing the Co/Sr2+ molar ratio, the nanofibers possess a slightly rough surface and hollow structure. It indicated that the crystallite of the nanofibers grow up with the increase of Sr2+.Figure 2


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

Pan L, Cao D, Jing P, Wang J, Liu Q - Nanoscale Res Lett (2015)

SEM images of CoFe2O4/SrFe12O19nanofibers with different Co/Sr2+molar ratios: (a) 8.0, (b) 5.0, (c) 3.0, (d) 1.8, and (e) 0.8.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4385261&req=5

Fig2: SEM images of CoFe2O4/SrFe12O19nanofibers with different Co/Sr2+molar ratios: (a) 8.0, (b) 5.0, (c) 3.0, (d) 1.8, and (e) 0.8.
Mentions: As shown in Figure 2, SEM images clearly exhibit the morphologies of CoFe2O4/SrFe12O19 nanofibers with different Co/Sr2+ molar ratios (8.0, 5.0, 3.0, 1.8, and 0.8). Continuously linear structure and uniform diameter can be seen in all annealed nanofibers after the PVP was removed. And the diameter of these nanofibers ranged from 200 to 350 nm. When the Co/Sr2+ molar ratio is higher than 5.0, the nanofiber surface is smooth in Figure 2a,b. Decreasing the Co/Sr2+ molar ratio, the nanofibers possess a slightly rough surface and hollow structure. It indicated that the crystallite of the nanofibers grow up with the increase of Sr2+.Figure 2

Bottom Line: Nanocomposite of CoFe2O4/SrFe12O19 has been synthesized by the electrospinning and calcination process.The crystal structures, morphologies, and magnetic properties of these samples have been characterized in detail.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.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory for Magnetic and Magnetic Materials of the Ministry of Education, Lanzhou University, Lanzhou, 730000 People's Republic of China.

ABSTRACT
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.

No MeSH data available.


Related in: MedlinePlus