Aligned magnetic blend of polystyrene polyvinylpyrrolidone (PS PVP) nanofibers were prepared by this method. First, polystyrene polyvinylpyrrolidone (PS PVP) blend solution in THF was synthesized. Then magnetic of PS-PVP-Fe3O4 polyethylene glycol (PEG) was prepared by masking method. Finally, magnetic nanofiber of PS-PVP-Fe3O4 PEG was prepared by electrospinning method, too. An electric potential difference of 25 kV was applied between the collector and a syringe tip, and the distance between the collector and the tip was 13 cm. Fe3O4 is exhibit various magnetic properties of which the complex permeability and the permittivity, in particular, are important in determining their high frequency characteristics. The magnetic oxide particles and nanofiber of nanometer size were characterized by TEM and SEM respectively. The thermal properties of nanofibers were determined by TGA and DSC. The magnetic characterization of the fibers was also performed by VSM and AFM techniques. On the other hand, nanofiber with diameters ranging from 30 to 40 nm, showing at room temperature, coercive field values of around 25 kV and saturation magnetization was 11 emu/g. Microwave reflection loss of the sample was tested at 8-12 GHz microwave frequencies and the results showed that magnetic nanofiber possessed the microwave absorbing properties. (C) 2014 Elsevier B.V. All rights reserved.