Temperature dependence of post-sintered annealing on magnetic properties of intergranular phase in Nd-Fe-B permanent magnet

Akira Yasui; Tetsuya Nakamura; Yoshinori Kotani; Tomoki Fukagawa; Takeshi Nishiuchi; Satoshi Hirosawa

doi:10.1063/1.4916938

Temperature dependence of post-sintered annealing on magnetic properties of intergranular phase in Nd-Fe-B permanent magnet

Akira Yasui, Tetsuya Nakamura, Yoshinori Kotani, Tomoki Fukagawa, Takeshi Nishiuchi, Satoshi Hirosawa

Collaborative Research Division of Non-ferrousMetallurgy and Environmental Science

Research output: Contribution to journal › Article

6 Citations (Scopus)

Abstract

Post-sinter-annealing temperature (T_a) dependences of the chemical and magnetic properties of intergranular (grain boundary; GB) phase in a Nd_14.0Fe_79.7B_6.2Cu_0.1 sintered magnet have been investigated by x-ray absorption spectroscopy and its magnetic circular dichroism. A relative change of the Cu concentration in the GB phase is found to depend on T_a and shows the maximum at T_a = 500 °C. The T_a-dependence of the Cu concentration was very similar to that of the coercivity. On the other hand, there is no significant T_a-dependence for the magnetization at the fracture surface: the Fe magnetic moment is 1.7 ± 0.036 μ_B at all T_a. The Cu-rich layer segregated in the GB phase would have a key role in the coercivity enhancement of the Nd-Fe-B sintered magnet.

Original language	English
Article number	17B313
Journal	Journal of Applied Physics
Volume	117
Issue number	17
DOIs	https://doi.org/10.1063/1.4916938
Publication status	Published - 2015 May 7

ASJC Scopus subject areas

Physics and Astronomy(all)

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Yasui, A., Nakamura, T., Kotani, Y., Fukagawa, T., Nishiuchi, T., & Hirosawa, S. (2015). Temperature dependence of post-sintered annealing on magnetic properties of intergranular phase in Nd-Fe-B permanent magnet. Journal of Applied Physics, 117(17), [17B313]. https://doi.org/10.1063/1.4916938

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abstract = "Post-sinter-annealing temperature (Ta) dependences of the chemical and magnetic properties of intergranular (grain boundary; GB) phase in a Nd14.0Fe79.7B6.2Cu0.1 sintered magnet have been investigated by x-ray absorption spectroscopy and its magnetic circular dichroism. A relative change of the Cu concentration in the GB phase is found to depend on Ta and shows the maximum at Ta = 500 °C. The Ta-dependence of the Cu concentration was very similar to that of the coercivity. On the other hand, there is no significant Ta-dependence for the magnetization at the fracture surface: the Fe magnetic moment is 1.7 ± 0.036 μB at all Ta. The Cu-rich layer segregated in the GB phase would have a key role in the coercivity enhancement of the Nd-Fe-B sintered magnet.",

author = "Akira Yasui and Tetsuya Nakamura and Yoshinori Kotani and Tomoki Fukagawa and Takeshi Nishiuchi and Satoshi Hirosawa",

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AU - Yasui, Akira

AU - Nakamura, Tetsuya

AU - Kotani, Yoshinori

AU - Fukagawa, Tomoki

AU - Nishiuchi, Takeshi

AU - Hirosawa, Satoshi

PY - 2015/5/7

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