Magnetic hard/soft nanocomposite ferrite aligned hollow microfibers and remanence enhancement

摘要

The nanocomposite SrFe_(12)O_(19)/Ni_(0.5)Zn_(0.5)Fe_2O_4 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°C for 2h, fabricating from SrFe_(12)O_(19) nanoparticles and Ni_(0.5)Zn_(0.5)Fe_2O_4 nanoparticles with a uniform phase distribution. These nanocomposite ferrite microfibers show a combination of magnetic characteristics for the hard (SrFe_(12)O_(19)) and soft (Ni_(0.5)Zn_(0.5)Fe_2O_4) phase with an enhanced remanence owing to the exchange-coupling interactions. The aligned microfibers exhibit a shape anisotropy.