Magnetic Materials Essay

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Magnetic materials are essential components of modern technology with applications ranging from the recording media to medical imaging. The particles having the size below 100nm shows the physical and chemical properties which are neither the atom nor bulk counterparts [1]. When we go from bulk to nano quantum size effects and the large surface area of magnetic nanoparticles dominate and show some changes in magnetic properties and show the super paramagnetic phenomena. Super paramagnetic nanoparticles show a high potential for some applications in different areas such as Magnetic resonance imaging, ferrofluids, targeted drug delivery, magnetic hyperthermia, magnetofection, magnetic separation: cell, DNA, protein separation, RNA fishing. [2-5]. Due to the technological applications, especially in biomedical science the iron oxide nanoparticles study increased rapidly. [6–8]. Magnetic nanoparticles size range varies from a few nanometers up to tens of nanometers, which are smaller than those of a cell (10-100μm), a virus (20-450nm), a protein (5-50nm) or a gene (2nm wide and 10-100nm long). This means that magnetic nanoparticles can be used for biomedical applications. The magnetic nanoparticles have a large surface area that can be modified to attach biological agents i.e. a bioactive molecule or a legend for targeting. So the magnetic nanoparticles can be used to deliver a package, such as an anticancer drug, or a cohort of radionuclide atoms, to a targeted region of the body, such as a tumor. The important magnetic property of these nanoparticles on the nanoscale is superparamagnetism which shows much higher magnet susceptibilities than the traditional paramagnets. When the size of the... ... middle of paper ... ...So, it can be said as the excitonic emission of γ-Fe2O3 nanoparticles. 3.4 VSM Analysis Fig. 4 shows the magnetic hysteresis curve of γ-Fe2O3 nanoparticles observed at room temperature. Magnetization curves of the nanoparticles were measured at 10,000 gauss. The development of saturated loop confirms the magnetic nature of the sample. The small value of hysteresis and remnant magnetization which can be neglected indicates that these particles are superparamagnetism in nature. The typical characteristic of the superparamagnetic behavior in the magnetization curve showed very small coercivity (~131.66 gauss) and remanance (~1.46emu/g). A saturation magnetization of ~13.4 emu/g was determined for the fine γ-Fe2O3 particles.

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