Formation and characterization of magnetic barium ferrite hollow fibers with low coercivity via co-electrospun

•BaFe12O19 fibers were prepared via electrospinning successfully.•The coercivity has a value of a few hundred oersteds for the hollow fibers made by coaxial electrospun.•BaFe12O19 with high saturation magnetization and low coercivity shows great potential in microwave absorbing application.

BaFe12O19 fibers and hollow fibers were successfully prepared by electrospun and co-electrospun. A very interesting result appeared in this study that hollow fibers made by co-electrospun showed low coercivity values of a few hundred oersteds, compared with the coercivity values of more than thousand oersteds for the fibers made by electrospun. So the hollow fibers with high saturation magnetization (Ms) and while comparatively low coercivity (Hc) exhibited strong magnetism and basically showed soft character. And this character for hollow fibers will lead to increase of the permeability for the samples which is favorable for impedance matching in microwave absorption. So these hollow fibers are promised to have use in a number of applications, such as switching and sensing applications, electromagnetic materials, microwave absorber.