Development of Co-lean (Sm,Y)(Fe,Co,Ti)12 compounds with large saturation magnetization

Abstract Large saturation magnetization in the SmFe 12 -based compounds is realized by substitution of scarce Co for Fe site. However, reduction of Co is necessary for their potential practical applications. In this work, we successfully decrease the concentration of Co, from 17.3 at% to 8.7 at% while maintaining large μ 0 M s of 1.41 T at 300 K in Ti reduced Sm 0.8 Y 0.2 (Fe 0.9 Co 0.1 ) 11.25 Ti 0.75 compound. In addition, we report the highest μ 0 M s for bulk Sm 0.8 Y 0.2 (Fe 0.8 Co 0.2 ) 11.25 Ti 0.75 with μ 0 M s = 1.49 T, μ 0 H a = 9.14 T at 300 K and T c = 831 K. We demonstrate (Sm 0.8 Y 0.2 )Fe 12 -based compounds exhibit superior intrinsic magnetic properties than Nd 2 Fe 14 B above 473 K.