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Synthesis and characterization of Co1-xCuxFe2-xAlxO4 ferrite nano-scales as a potential candidate for high density data storage applications
Nano-crystalline Co1-xCuxFe2-xAlxO4 (x= 0.0, 0.2, 0.4, 0.6 and 0.8) ferrite powders were synthesized using co-precipitation method. The influence of Cu2+–Al3+ ions substitution on the structural, morphological and magnetic properties of the powders were investigated by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, field-emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray (EDX), transmission electron microscopy (TEM), thermo-gravimetry (TG) and vibrating sample magnetometer (VSM). A small peak of anti-ferromagnetic α-Fe2O3 phase was observed as a secondary phase of composition with the nano-crystalline ferrite single cubic spinel structure in the X-ray diffraction. The lattice constant ‘a’ increases from 8.344 Å (x= 0.0) to 8.379 Å (x=0.4) as the Cu-Al contents increase. Infrared spectral analysis data between 200 and 1000 cm-1 defined the intrinsic cation vibrations of the characteristic spinel structure system. FE-SEM images show that the particle sizes in the synthesized samples are homogeneous and uniformly distributed. The study of transmission electron microscopy micrographs clearly show the nanostructure nature of the samples are spherically shaped with little agglomeration. The saturation magnetization (Ms) and coercivity (Hc) of the Co1-xCuxFe2-xAlxO4 were found to be in the range of 25–80 emu/g and 184–608 Oe, respectively, which is in the range of soft ferrite. The observed variation in saturation magnetization as a function of Cu-Al concentrations was attributed to the redistribution of cations at cobalt ferrite sites. The coercivity and remanence magnetization of the material were affected noticeably by doped Cu-Al cobalt ferrites. Based on coercive field, M-H loops and crystalline size of the samples it is suggested that these materials have potential applications in high-density data storage devices.
CH16015 Accepted 13 June 2016
© CSIRO 2016