Abstract: The composite nanofibers of SrTiO₃/SrFe₁₂O₁₉ with a molar ratio of 1:1 and diameter about 120 nm were prepared by electrospinning. Effects of calcination temperature on the formation, crystallite size, morphology and magnetic property were studied by infrared spectroscopy, X-ray diffraction, scanning electron microscopy and vibrating sample magnetometer. The binary phase of strontium ferrite and titanate was formed after being calcined at 900°C for 2 h and the composite nanofibers were fabricated from nanograins of SrTiO₃ about 24 nm and SrFe₁₂O₁₉ around 33 nm. The crystallite sizes for the nanofibers increase with increasing calcination temperature and the addition of SrTiO₃ has an obvious suppression effect on SrFe₁₂O₁₉ grain
growth. The specific saturation magnetization and remanence tend to increase with the crystallite size. With increasing calcination temperature from 900 to 1050°C, the coercivity increases initially, achieving a maximum value of 520.2 kA?m^-1 at 950°C, and then shows a reduction tendency.

Key words: Composite nanofibers, Strontium ferrite, Strontium titanate, Electrospinning, Magnetic property