Magnetic and microwave absorption properties of electrospun Co0.5Ni0.5Fe2O4 nanofibers

► Co0.5Ni0.5Fe2O4 nanofibers with diameters of 70-100 nm were prepared via an electrospinning technique. ► The microwave absorption performance of Co-Ni ferrite nanofibers was reported for the first time. ► The calcination temperature has significant effects on the surface morphology and magnetic properties of the nanofibers. ► Co0.5Ni0.5Fe2O4 nanofibers have a good microwave absorbing performance in the Ku-band.