Exchange-spring permanent magnet particles produced by spark-erosion

Hansen, M. F.; Vecchio, K. S.; Parker, F. T.; Spada, F. E.; Berkowitz, A. E.
March 2003
Applied Physics Letters;3/10/2003, Vol. 82 Issue 10, p1574
Academic Journal
Exchange-spring permanent magnet particles of composition Pr[sub 6.93]Fe[sub 85.7]B[sub 5.95]Nb[sub 1.39] in at. % were prepared by spark-erosion in liquid argon. The best exchange-spring properties were achieved after vacuum annealing the as-sparked powders at 700 °C for ∼5 min, and did not change significantly for anneals up to 120 min. This behavior suggests that the equilibrium dimensions of the "hard" and "soft" phases were determined by the sizes of the spark-eroded particles in which they developed. The Pr[sub 2]Fe[sub 14]B phase developed as spheres, likely single crystals, in an α-Fe+Fe[sub 2]B matrix.


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