Coercivity enhancements by high-magnetic-field annealing in sintered Nd–Fe–B magnets

Kato, Hiroaki; Miyazaki, Terunobu; Sagawa, Masato; Koyama, Keiichi
May 2004
Applied Physics Letters;5/24/2004, Vol. 84 Issue 21, p4230
Academic Journal
An influence of a high-field annealing on the magnetic properties was investigated in sintered Nd–Fe–B magnets. When the sample B, containing 0.32 at. % Al, was annealed at Ta=550 °C under a magnetic field of Ha=140 kOe and then cooled without field, the coercivity Hc increased by 25% with respect to the control sample annealed at zero field. As for the sample C, containing both Cu 0.13 at. % and Al 0.32 at. %, higher Hc values were obtained when it was annealed at Ta=550 °C and the field of Ha=140 kOe was kept applied down to the room temperature. These results were discussed in terms of a field-induced change in interface matching between Nd2Fe14B and intergranular phases. © 2004 American Institute of Physics.


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