MAGNETIC PROPERTIES OF SPINEL FERRITE MFe2O4 (M = Fe, Co) NANOMATERIALS SYNTHESIZED BY CO-PRECIPITATION METHOD
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Abstract
In this study, spinel ferrite MFe2O4 (M = Fe, Co) nanoparticles were successfully synthesized by a simple co-precipitation method with 5% NaOH solution as the precipitating agent. The single-phase spinel FeFe2O4 nanoparticles were formed at room temperature, while CoFe2O4 nanoparticles were obtained after annealing the corresponding precursor at 800°C for one hour. Transmission electron microscopy (TEM) images show that the FeFe2O4 nanoparticles have a spherical shape with a particle size of 5–10 nm, while the CoFe2O nanoparticles have a cubic shape with a particle size of 20–30 nm. The synthesized FeFe2O4 nanomaterial had superparamagnetic properties with very high saturation magnetization (Ms = 85.7 emu/g) while the CoFe2O4 nanomaterial exhibited the properties of hard magnetic material with high remanent magnetization and coercivity (Mr = 63.58 emu/g, Hc = 1092.17 Oe). Both two spinel ferrite MFe2O4 nanomaterials were strongly attracted by rare earth magnets.
Keywords
FeFe2O4, CoFe2O4, co-precipitation method, nanomaterial, magnetic properties
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References
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