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

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.

Optimizing the magnetic properties of hard and soft materials for producing exchange spring permanent magnets

“…Among the hard materials investigated so far, strontium hexaferrite (SFO) has received large attention owing to its chemical stability, large availability, low production cost and good magnetic properties (saturation magnetization M S = 70-72 Am 2 kg −1 , coercivity H C = 400 kA m −1 and BH max close to 40 kJ m −3 ), characteristics that make it a leading candidate in the PM market. Large efforts have been spent on increasing the BH max of SFO by combination with hard or soft spinel cubic ferrite (MFe 2 O 4 M=Co, Fe, Mn) or metal alloys (FeCo) [19][20][21][22][23][24][25]. In view of the possible production at the industrial scale, the use of metal oxides is particularly promising due to their stability against corrosion and mechanical processing.…”

Spin Disorder and Particle Size Effects in Cobalt Ferrite Nanoparticles with Unidirectional Anisotropy and Permanent Magnet-like Characteristics

“…From the (BH) max versus H plot in Figure b, we have obtained the maximum value of 2.4 MGOe for C-2. To the best of our knowledge, this (BH) max product at room temperature exceeds the values previously reported for CoFe 2 O 4 . , We have compared the (BH) max value of C-2 with other reports, and a comparative analysis is presented in Table S3. ,− …”

Synthesis and characterization of electrospun Ni0.5Co0.5−xCdAlahmari1, Almessiere2, Slimani3 et al. 2020Nano-Structures & Nano-Objects

“…The electrospinning technique is certified to be an economic, simple and adaptable method to produce various 1D nanosized structures. Nanofibers exhibit large shape anisotropy, high surface/volume ratio, and high facet ratio in comparison with bulks or even nanoparticle materials [25].…”