Magnetic anisotropy in bulk nanocrystalline SmCo_5 permanent magnet prepared by hot deformation

摘要

Bulk anisotropic nanocrystaliine SmCo_5 magnets have been prepared by hot deformation method. The height reduction of the magnets plays a key role in inducing the crystallographic alignment in the magnet. Increase of height reduction to 90% leads to the formation of platelet shape grains perpendicular to the press direction; correspondingly c-axis crystallographic texture and magnetic anisotropy were developed in the deformed magnets. The coercivity of the magnets increases first, and then decreases again with the increase of the height reduction. The magnet with 70% height reduction exhibits a high coercivity over 5 T.