One-Dimensional SrFe12O19/Ni0.5Zn0.5Fe2O4 Composite Ferrite Nanofibers and Enhancement Magnetic Property
SrFe12O19/Ni0.5Zn0.5Fe2O4 composite ferrite nanofibers of diameters about 100 nm with mass ratio 1:1 have been prepared by the electrospinning and calcination process. The SrFe12O19/Ni0.5Zn0.5Fe2O4 composite ferrites are formed after calcined at 700 °C for 2 hours. The composite ferrite nanofibers are fabricated from nanosized Ni0.5Zn0.5Fe2O4 and SrFe12O19 ferrite grains with a uniform phase distribution. The ferrite grain size increases from about 11 to 36 nm for Ni0.5Zn0.5Fe2O4 and 24 to 56 nm for SrFe12O19 with the calcination temperature increasing from 700 to 1100 °C. With the ferrite grain size increasing, the coercivity ( H c ) and remanence ( M r ) for the SrFe12O19/Ni0.5Zn0.5Fe2O4 composite ferrite nanofibers initially increase, reaching a maximum value of 118.4 kA/m and 31.5 Am2/kg at the grain size about 40 nm (SrFe12O19) and 24 nm (Ni0.5Zn0.5Fe2O4) respectively, and then show a reduction tendency with a further increase of the ferrite grain size. The specific saturation magnetization ( M sh) of 63.2 Am2/kg for the SrFe12O19/Ni0.5Zn0.5Fe2O4 composite ferrite nanofibers obtained at 900 °C for 2 hours locates between that for the single SrFe12O19 ferrite (48.5 Am2/kg) and the single Ni0.5Zn0.5Fe2O4 ferrite (69.3 Am2/kg). In particular, the M r value 31.5 Am2/kg for the SrFe12O19/Ni0.5Zn0.5Fe2O4 composite ferrite nanofibers is much higher than that for the individual SrFe12O19 (25.9 Am2/kg) and Ni0.5Zn0.5Fe2O4 ferrite (11.2 Am2/kg). These enhanced magnetic properties for the composite ferrite nanofibers can be attributed to the exchange-coupling interaction in the composite.
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Document Type: Research Article
Publication date: 01 August 2011
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