Abstract
Publisher Summary This chapter reviews the magnetic structures observed in the RE 2 Fe 14 B (RE=Nd, Pr) system using various transmission electron microscopes (TEM) magnetic imaging techniques. It presents the studies of die-upset Nd-based permanent magnets conducted mainly at Brookhaven National Laboratory in 1993–1999. Investigations on Nd–Fe–B sintered magnets and single crystals as well as on Pr–Fe–B die-upset magnets are presented in the chapter. The chapter reviews the microstructure, including grain alignment and secondary phases of the materials and grain boundary structure and composition of the intergranular phase. The domain structure, such as the width of domains and domain walls, and the domain wall energy is described in the chapter. The Monte Carlo simulation of the effects of demagnetization fields is presented in the chapter. In situ experiments on the dynamic behavior of domain reorientation as a function of temperature, pinning, and grain boundary nucleation related to coercivity under various fields are described in the chapter.
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