from the conferences organized by TANGER Ltd.
The high energy ball-milling (HEBM) procedure has been used for the preparation of magnetically hard/soft (1-x)SrFe12O19/xCo nanocomposite (with x = 0.1, 0.2 and 0.3). Effects of aging temperatures (800 - 1000 °C) on microstructure, morphology and magnetic properties have been studied. X-ray diffraction spectrum indicates the existence of two phases: the hexagonal SrFe12O19 and Co after HEBM process. Scanning electron microscopy was used to characterize the morphology, size and elemental composition of the synthesized nanocomposites. Thermal gravimetric analysis/differential scanning calorimetry were used to estimate the phase transition temperatures of the nanocomposites. The magnetic characterization was carried out via vibrating sample magnetometer at room temperature for the nanocomposite that showed the magnetically single-phase behavior. With increasing the content of Co, the coercivity (Hc) of the nanocomposites is decreased. Specific saturation magnetization (σs) is clearly increased with increasing of aging temperatures until reached the maximum (σs = 110 Am2/kg) with x = 0.1 aged at 1000 °C. The nanocomposite with x = 0.1 aged at 800 °C has enhancement in the squareness ratio (σr/σs) that reached to 10.2% increment in comparison with the single phase SrFe12O19. The HEBM process and synthesized SrFe12O19/Co nanocomposite can be regarded as a suitable technique for preparing hard magnetic nanomaterial for permanent magnets.
Keywords: Ball-milling, nanocomposite, SrFe12O19, single-phase© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.