Preparation and magnetic characterization of ultrafine-grained ξ-Mn_2N_(0.86) compound bulk

摘要

The ultrafine-grained ξ-Mn_2N_(0.86) compound bulk was prepared by a novel method that combined the solid-gas reaction, ball milling and spark plasma sintering. Characterizations on the magnetic properties showed that the Neel temperatures of the ball-milled powder and the ultrafine-grained bulk of Mn_2N_(0.86) compound are drastically reduced as compared with the coarse-grained polycrystalline ξ-phase Mn-N compounds. Furthermore, it was found that the antiferromagnetism and the weak ferromagnetism coexist in the ball-milled powder and the ultrafine-grained bulk of Mn_2N_(0.86); compound.