Abstract
M-type hexagonal Sr0.93SmxFe12.07−xO19 and Sr0.93Sm0.1Fe11.97O19/Fe3O4 (SSFO/Fe3O4) composites are prepared by the ball-milling-assisted ceramic process and the solvothermal method, respectively. Substitution of Fe3+ ions by Sm3+ ions can significantly enhance the specific saturation magnetization (Ms), remanence (Mr), and coercivity (Hc) of Sr0.93SmxFe12.07−xO19. Increase in coercivity is attributed to an increase in the magnetrocrystalline anisotropy and a reduction in the particle size after substitution of Fe3+ ions by Sm3+ ions. Sr0.93Sm0.10Fe11.97O19 has the highest specific saturation magnetization value (71.16 emu/g). By contrast, 2.91% increase in specific saturation magnetization and 22.86% increase in coercivity for SSFO/Fe3O4 composite with 4:1 mass ratio of hard to soft ferrites are observed, respectively, as compared to the pure SSFO. Besides, SSFO/Fe3O4 composite with 4:1 mass ratio of hard to soft ferrites behaves higher Mr (33.80 emu/g) and Hc (2624.27 Oe) values than theoretically calculated values of 30.60 emu/g and 1722.72 Oe, indicating the presence of strong exchange coupling interaction between the hard SSFO and soft Fe3O4 phases.
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