Enhancement of Maximum Energy Product by -Fe Coating on the Side of Rectangular Sm(Fe_0.8Co_0.2)₁₂ Nanoparticles

The demagnetization process of exchange-coupled Sm(Fe0.8Co0.2)(12)/alpha-Fe nanocomposite magnet particles with alpha-Fe phase coated on the sides of rectangular Sm(Fe0.8Co0.2)(12) nanoparticles and the effect of Fe phase arrangement on their (BH) max are systematically investigated from micromagnetics calculations. The (BH) max of the reference model Sm(Fe0.8Co0.2)(12) particles without Fe layer was 630 kJ/m(3). On the other hand, the (BH) max of the nanocomposite magnet particle model, in which the four sides of the hard phase are coated with a soft phase, was found to have the highest (BH) max of 678 kJ/m(3). This result may provide a guideline for designing high-performance magnet particle materials while reducing the use of rare metals.