Anisotropy and Microstructure of High-Coercivity Rare Earth Permanent Magnets.

摘要

In Nd2 Fe14 B-based permanent magnets the coercivity is in practice only 20 - 40 % of the theoretical limits. The aim of this study is to investigate Nd-Fe-B based compounds with respect to their magnetic anisotropy behavior and to characterize the microstructure of sintered Nd-Fe-B based permanent magnets. The anisotropy field HA was determined by using the Singular Point Detection (SPD) technique, and the microstructural investigations were carried out on a JEOL 200 CS analytical transmission electron microscope equipped with a high take-off energy dispersive (EDS) X-ray analyzer. Keywords: Magnetic anisotropy, Anisotropy field; pulsed field technique; Microstructure; electron microscopy; intrinsic coercive force; Nd-Fe-B permanent magnets. (JES)