Magnetic Nanoparticles doped with rare-earth iron complex structure and magnetic properties
With the rapid development of nanotechnology, magnetic nanoparticles of iron composite materials have significantly different from the conventional materials of special physical and chemical properties, has become one of the focuses of attention and study. In a number of ferromagnetic nanocomposites, Fe/Fe3O4 the composite materials have good mechanical properties and magnetic properties (relatively high saturation magnetization and low coercivity), is an ideal new ferromagnetic materials, so in a variety of magnetic fluid, magnetic recording, and cell separation, targeted drug fields of biomedicine has wide application prospects.
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This paper reviews the status of nano-magnetic research, the system introduces ferromagnetic nanocomposites research background, summarized and reviewed in recent years, lanthanide doped magnetic nano-materials synthesis and surface modification of the progress made and problems faced. We use the disproportionation reaction of Fe2 + by hydrothermal and solvothermal method, were successfully prepared doped with different rare earth ions Fe/Fe3O4 ferromagnetic nanocomposites. Application of powder-X-ray diffraction (XRD), field emission scanning electron microscopy (SEM), transmission electron microscopy (TEM), vibrating sample magnetometer (VSM), Superconducting quantum interference device (SQUID), Moose Paul spectroscopy (Mossbauer) means of synthesis conditions and doping ion concentration of the rare earth magnetic compounds of iron crystal structure, appearance and size of type, doping concentration and doped Ge Wei, and magnetic properties and the control law, made a series of important conclusions and innovative results for the rare-earth ferromagnetic nanocomposites become a very promising new type of magnetic material to lay a solid foundation.
Replace the complex of rare earth ions in the spinel ferrite Fe/Fe3O4 the Fe3 + ions, which led to complex changes in magnetic properties, is the focus of this research. We passed a lot of experimental data, in-depth study of the synthesis method, rare earth ion incorporation, the incorporation of rare earth ion type and sample type to change the appearance of nanocrystalline composite structure and magnetic properties.
How to magnetic nano-materials based on physical and chemical properties and size, structure, morphology of the micro-relations, designed for applications with superior performance of the material, nano-science and technology through the controlled synthesis of the material and properties of transformation, will be the beginning of the 21st century the main task. Magnetic nano-materials science, nano-materials will be a star shine in a pivotal role to play in all areas.
