Anisotropic bulk Nd2Fe14B/α-Fe nanohybrid magnets with an enhanced energy product

Anisotropic bulk Nd2Fe14B/α-Fe nanohybrid magnets have been prepared by high-pressure thermal compression (HPTC) of the blends of 70 wt% Nd-lean Nd9Fe85.5Cu1.5B4 amorphous and 30 wt% Nd-rich Nd13.6Fe73.6Ga0.6Co6.6B5.6 nanocrystalline alloys. The nanohybrid magnets have a high fraction ∼24 wt% of α-Fe phase and exhibit a (0 0 l) texture for Nd2Fe14B nanocrystals in both Nd-lean and Nd-rich regions. The Nd-lean region contains α-Fe and Nd2Fe14B nanograins with equivalent sizes of 19 nm and 27 nm and the Nd-rich region comprises Nd2Fe14B phase having lath nanograins with 20-35 nm in thickness and 50-142 nm in length. This nanohybid magnet exhibits a maximum energy product of 23 MGOe and an enhanced thermal stability. The present work provides a candidate route to fabricate high-performance bulk magnets for practical applications.