Barium Ferrite-Silica Nanocomposites with magnetic properties

What is it about?

Barium ferrite-silica (BaM-SiO2) nanocomposites of different molar ratios by high-energy ball milling, followed by heat-treatment at different temperatures were studied. The microstructure, morphology and magnetic properties were characterized for different synthesis conditions by using (XRD), (SEM) and (VSM). The results indicate that 15 h of milling was enough to avoid the generation of hematite phase and to get a good dispersion of barium ferrite particles in the ceramic matrix. The highest saturation magnetization (Ms) value obtained was 43 emu/g and the corresponding coercivity (Hc) value of 3.4 kOe for the composition 60BaM-40SiO2 milled for 15 h and heat treated at 900 °C. This coercivity value is acceptable for the application in magnetic recording media.

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Why is it important?

M-type BaM, have the lowest price per unit of magnetic energy and are used for numerous applications such as permanent magnets, particulate media for magnetic recording and microwave devices due to its excellent chemical and physical properties such as large magnetocrystalline anisotropy, high curie temperature, acceptable mechanical hardness, excellent chemical stability, relatively large saturation magnetization and high-corrosion resistance

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