Chemical synthesis and magnetic properties of monodisperse cobalt ferrite nanoparticles

In this work, a successful synthesis of magnetic cobalt ferrite (CoFe2O4) nanoparticles is presented. The synthesized CoFe2O4 nanoparticles have a spherical shape and highly monodisperse in the selected solvent. The effect of different reaction conditions such as temperature, reaction time and varying capping agents on the phase and morphology is studied. Scanning transmission electron microscopy showed that the size of these nanoparticles can be controlled by varying reaction conditions. Both X-ray diffraction and energy dispersive X-ray spectroscopy corroborate the formation of CoFe2O4 spinel structure with cubic symmetry. Due to optimized reaction parameters, each nanoparticle was shown to be a single magnetic domain with diameter ranges from 6 to 16 nm. Finally, the magnetic investigations showed that the obtained nanoparticles are superparamagnetic with a small coercivity value of about 315 Oe and a saturation magnetization of 58 emu/g at room temperature. These results make the cobalt ferrite nanoparticles promising for advanced magnetic nanodevices and biomagnetic applications.Comment: 10 pages, 9 figure

Structural and magnetic properties of Co0.7Ni0.3Fe2O4 nanoparticles synthesized by sol-gel method

International audienceIn this paper, we present the structural and magnetic properties of Co0.7Ni0.3Fe2O4 nanoparticles. The nanoparticles are prepared by the sol-gel method; structural analysis by X-ray diffraction shows that the nanoparticles are pure phase with the spinel structure. Transmission electron microscopy analysis reveals the local microstructure of the particles and their size range of 6-8 nm, with isometric shape. The magnetic properties obtained with magnetic properties measurement system demonstrate the soft magnetic character of the nanoparticles

Experimental studies of neodymium ferrites doped with three different transition metals

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Magnetically controlled insertion of cobalt ferrite nanoparticles into a porous anodic aluminum oxide (AAO) membrane

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