Abstract
The magnetic hard-soft CoFe2O4–CoFe2 nanocomposite microfibers have been synthesized by the sol–gel and partial reduction process, where CoFe2O4 ferrite is the hard phase with a grain size range from 43 to 62 nm and CoFe2 alloy the soft phase with grain sizes around 30 nm. These nanocomposite microfibers exhibit the magnetization behavior like a single phase magnetic material, and the magnetic exchange coupling effects are observed between the hard and soft phases. The specific saturation magnetization of CoFe2O4–CoFe2 nanocomposite microfibers shows an increase tendency with the increasing weight fraction of CoFe2, while the coercivity is consequently reduced. The nanocomposite microfibers have a maximum remanence 51.7 Am2/kg when the phase contents of CoFe2 around 28 wt% and CoFe2O4 about 72 wt%.
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