Width-controlled M-type hexagonal strontium ferrite (SrFe12O19) nanoribbons with high saturation magnetization and superior coercivity synthesized by electrospinning

Abstract

Width-controlled M-type hexagonal SrFe12O19 nanoribbons were synthesized for the first time via polyvinylpyrrolidone (PVP) sol assisted electrospinning followed by heat treatment in air, and their chemical composition, microstructure and magnetic performance were investigated. Results demonstrated that as-obtained SrFe12O19 nanoribbons were well-crystallized with high purity. Each nanoribbon was self-assembled by abundant single-domain SrFe12O19 nanoparticles and was consecutive on structure and uniform on width. PVP in the spinning solution played a significant influence on the microstructure features of SrFe12O19 nanoribbons. With PVP concentration increasing, the ribbon-width was increased but the particle-size was reduced, which distributed on a same ribbon were more intensive, and then the ribbon-surface became flat. The room temperature magnetic performance investigation revealed that considerable large saturation magnetization (Ms) and coercivity (Hc) were obtained for all SrFe12O19 nanoribbons, and they increased with the ribbon-width broadening. The highest Ms of 67.9 emu·g−1 and Hc of 7.31 kOe were concurrently acquired for SrFe12O19 nanoribbons with the maximum ribbon-width. Finally, the Stoner-Wohlfarth curling model was suggested to dominate the magnetization reverse of SrFe12O19 nanoribbons. It is deeply expected that this work is capable of opening up a new insights into the architectural design of 1D magnetic materials and their further utilization.

Ferrites Obtained by Sol-Gel Method

“…Moreover, nanoribbons also could be considered as a development by cutting a finite-width slice from the 2D nanosheets. In this context, width-controlled SrFe 12 O 19 (strontium ferrite) nanoribbons were synthesized via a polymer sol-assisted single-spinneret electrospinning route followed by heat treatment in air (Jing et al 2015).…”

“…7e). Subsequently, the (Jing et al 2015) jet is subjected to an unstable stage with a series of bending instabilities and anisotropic shrinkage and is finally elongated with or without branching/splitting and solidified to PVP/SrFe 12 O 19 composite precursor nanoribbons (Fig. 7f).…”

Dependence of phase configurations, microstructures and magnetic properties of iron-nickel (Fe-Ni) alloy nanoribbons on deoxidization temperature in hydrogen

“…Nanoribbons could also be regarded as a development by cutting a finite-width slice from the two-dimensional nanosheets. In recently works, we have demonstrated that the electrospun SrFe 12 O 19 and CoFe 2 O 4 nanoribbons both exhibited deeply impressed magnetic properties2224. To the best of our knowledge, there is still no public report on Fe-Ni alloy nanoribbons.…”

“…Earlier reports have certified that nanofibers20, nanotubes21 and nanoribbons22 could be directly obtained via the electrospinning route combined with a series subsequent treatments, and that all of these 1D nanostructures were tens of micrometers in length and their diameters or width can be flexibly tuned from nanometers to micrometers. To date, however, only Lee et al .…”

Resistivity Enhancement of Sr-Hexaferrite Using Rare Earth Dopant to Minimize Energy Losses

“…Among various advanced magnetic nano materials, M-type hexaferrite with chemical formula of MeFe 12 O 19 (Me=Sr, Ba and Pb) had demonstrated to be an important class of magnetic materials. For vast scientific and technological interests these ferrites have emerged as multifunctional materials due to the stability of their properties [4]. In 1950's, a classical hard magnetic material, strontium ferrite (SrFe 12 O 19 ) was discovered.…”