The nanocomposite SrFe12O19/Ni0.5Zn0.5Fe2O4 ferrite aligned hollow microfibers with the hollow diameter to the fiber diameter estimated about 3/5 have been prepared by the gel precursor transformation process. The nanocomposite binary ferrites with different mass ratios are formed after the precursor calcined at 900 degrees C for 2 h, fabricating from SrFe12O19 nanoparticles and Ni0.5Zn0.5Fe2O4 nanoparticles with a uniform phase distribution. These nanocomposite ferrite microfibers show a combination of magnetic characteristics for the hard (SrFe12O19) and soft (NiossZn(0.5)Fe(2)O(4)) phase with an enhanced remanence owing to the exchange-coupling interactions. The aligned microfibers exhibit a shape anisotropy. (C) 2010 Elsevier Inc. All rights reserved.