Fabrication, Characterization, and Magnetic Properties of Exchange-coupled Porous BaFe8Al4O19/Co0.6Zn0.4Fe2O4 Nanocomposite Magnets
Fabrication of exchange-coupled nanocomposite magnets has been considered to be the most effective way to achieve the high energy product for advanced permanent magnet applications. In this work, we report a facile auto-combustion synthesis to prepare porous exchange-coupled hard-soft ferrite based magnetic BaFe8Al4O19-x Wt.% Co0.6Zn0.4Fe2O4 nanocomposites (where x = 10, 20, 30 and 40), which realize an effective exchange-coupled interaction when the x is less than 30. Compared with BaFe8Al4O19, the optimized nanocomposite with 20% Co0.6Zn0.4Fe2O4 shows a 70.3% increase in Ms and a 60.4% enhancement in Mr and keeps a high Hc of 8.8 kOe. The work demonstrates that the auto-combustion synthesis is a promising approach for the fabrication of high-performance ferrite based permanent magnets.