Technology Development for Transition Metal-Rare Earth High-Performance Magnetic Materials.

摘要

The development of the technology for transition metal-rare earth high-performance magnetic materials that has taken place over the three year contract period is described in this report. This work has covered three general areas:the origin of the coercive force in high-anisotropy materials,phase equilibrium and chemistry,and studies of new materials and processing variables. The coercive force of single particles has been shown to be controlled by defects whose nature determines the behavior of magnetization discontinuities. Magnetic domain observations have been used to measure domain wall energies in several cobalt-rare-earths. The domain behavior of sintered magnets has been observed and correlated with their magnetic properties. (Modified author abstract)