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Sintered Nd-Fe-B magnets are prepared by powder metallurgy. Besides the composition of the alloy, the alignment of the powder particles is decisive for achieving high remanent polarizations. The alignment of the powder particles can be improved by applying field pulses in addition to an alignment in a constant magnetic field. Alternating field pulses parallel and antiparallel to the easy axis proved to be more efficient than unidirectional field pulses. By such a refined processing route sintered Nd-Fe-B magnets with a remanent polarization of 1.519 T, a coercivity H/sub cJ/ of 7.8 kA/cm (9.8 kOe), and a maximum energy density of 451 kJ/m/sup 3/ (56.7 MGOe) could be prepared.
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Rodewald et al. (2002) studied this question.
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