The microstructure and domain structures of high performance temperature-compensated sintered magnets with composition of Sm0.56GdxDy0.44-x(TM)7.22 (TM=Co0.68Fe0.22Cu0.08Zr0.02) 7.22 (0.0 ≤x≤0.4) have been investigated by using electron microscopy and magnetic force microscopy. Both microstructure and magnetic properties of these magnets show a significant dependence on the content of heavy rare earth Gd and Dy. The intrinsic coercive force increases significantly with increasing Gd content. It is found that there are two different types of grains in the magnets, which show different domain structures. The larger magnetocrystalline anisotropy, larger cell size, and coarser grain boundary region give rise to a higher coercivity in the Gd-rich magnets.
ASJC Scopus subject areas
- Physics and Astronomy(all)