BaFe12O19 single-particle-chain nanofibers : preparation, characterization, formation principle, and magnetization reversal mechanism

BaFe12O19 single-particle-chainnanofibers have been successfully prepared byan electrospinning method and calcinationprocess, and their morphology, chemistry,and crystal structure have been characterizedat the nanoscale. It is found that individualBaFe12O19 nanofibers consist of single nanoparticles which are found to stack along thenanofiber axis. The chemical analysis shows that the atomic ratio of Ba/Fe is 1:12, suggesting aBaFe12O19 composition. The crystal structure of the BaFe12O19 single-particle-chain nanofibersis proved to be M-type hexagonal. The single crystallites on each BaFe12O19 single-particlechainnanofibers have random orientations. A formation mechanism is proposed based onthermogravimetry/differential thermal analysis (TG-DTA), X-ray diffraction (XRD), and transmissionelectron microscopy (TEM) at six temperatures, 250, 400, 500, 600, 650, and 800 �C.The magnetic measurement of the BaFe12O19 single-particle-chain nanofibers reveals that thecoercivity reaches a maximum of 5943 Oe and the saturated magnetization is 71.5 emu/g atroom temperature. Theoretical analysis at the micromagnetism level is adapted to describe themagnetic behavior of the BaFe12O19 single-particle-chain nanofibers