부산대학교 도서관

${\rm MnBi/Sm}_{2}{\rm Fe}_{17}{\rm N}_{\rm x}$ bulk anisotropic hybrid magnets have been fabricated employing hot compaction of mechanically milled powders. The effects of ${\rm Sm}_{2}{\rm Fe}_{17}{\rm N}_{\rm x}$ content on the magnetic properties, density and texture of the hybrid magnets were investigated. With increasing ${\rm Sm}_{2}{\rm Fe}_{17}{\rm N}_{\rm x}$ content, the density of hybrid magnets decreases, their coercivity $(H_{c})$ remains nearly constant, while the remanence $(M_{r})$ increases drastically. The MnBi/40% ${\rm Sm}_{2}{\rm Fe}_{17}{\rm N}_{\rm x}$ magnet displays an $H_{c}$ value of 5.7 kOe with $M_{r}$ of 69 emu/g; these values for pure MnBi magnet are 6.5 kOe and 45 emu/g. An energy product $[(BH)_{max}]$ of 7 MGOe was obtained in the hybrid magnet with 40% ${\rm Sm}_{2}{\rm Fe}_{17}{\rm N}_{\rm x}$, which is 20% higher than that of single phase MnBi magnet [5.8 MGOe].