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Report No.

Interface nanostructure of Cu-added Nd-Fe-B sintered magnets processed by high magnetic fields

Akiya, Takahiro*; Kato, Hiroaki*; Takeda, Masayasu  ; Suzuki, Junichi; Yamaguchi, Daisuke; Koizumi, Satoshi; Sagawa, Masato*; Koyama, Keiichi*; Miyazaki, Terunobu*

Sintered Nd-Fe-B magnets consist of Nd$$_{2}$$Fe$$_{14}$$B main phase with about 5$$mu$$m diameter and Nd-rich grain boundary phase. It is well known that the coercivity of sintered Nd-Fe-B magnets is highly dominated by this Nd-rich phase, which is reported to change from discontinuous to continuous arrangement by a low temperature annealing around 500$$sim$$600$$^{circ}$$C. We have shown that the coercivity of sintered Nd-Fe-B magnets can be further increased by applying a high magnetic field during the annealing. We found that such a coercivity enhancement phenomenon occurred only when a small amount of Cu is added, and when the annealing temperature is around 500$$^{circ}$$C or 550$$^{circ}$$C. In this paper, we report on the results of interface nanostructure analysis by DSC and Small Angle Neutron Scattering experiments to investigate the reason magnetic field effect occurs only in Cu-containing samples at specific annealing temperatures.



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