Magnetic Properties of Low Rare-earty Content (Nd=2-7 at.%)α-Fe/Nd2Fe14B type Bulk Exchange Spring Magnets

Hideaki Ono; Tetsuro Tayu; Norihisa Waki; Tatsuo Sugiyama; Munekatsu Shimada; Makoto Kanou; Akira Fujiki; Hiroshi Yamamoto; Keisuke Takasugi; Masato Tani

doi:10.2497/jjspm.49.141

Magnetic Properties of Low Rare-earty Content (Nd=2-7 at.%)α-Fe/Nd₂Fe₁₄B type Bulk Exchange Spring Magnets

Hideaki Ono, Tetsuro Tayu, Norihisa Waki, Tatsuo Sugiyama, Munekatsu Shimada, Makoto Kanou, Akira Fujiki, Hiroshi Yamamoto, Keisuke Takasugi, Masato Tani

Author information

Hideaki Ono
Materials Research Laboratory, Nissan Research Center, Nissan Motor Co., Ltd.
Tetsuro Tayu
Materials Research Laboratory, Nissan Research Center, Nissan Motor Co., Ltd.
Norihisa Waki
Materials Research Laboratory, Nissan Research Center, Nissan Motor Co., Ltd.
Tatsuo Sugiyama
Materials Research Laboratory, Nissan Research Center, Nissan Motor Co., Ltd.
Munekatsu Shimada
Materials Research Laboratory, Nissan Research Center, Nissan Motor Co., Ltd.
Makoto Kanou
Materials Research Laboratory, Nissan Research Center, Nissan Motor Co., Ltd.
Akira Fujiki
Powertrain Operation Division, Nissan Motor Co., Ltd.
Hiroshi Yamamoto
School of Science and Technology, Meiji Univ.
Keisuke Takasugi
School of Science and Technology, Meiji Univ.
Masato Tani
SCM Division, IZUMI TECHNOLOGY CO., LTD.

Keywords: low rare-earth content (Nd=2-7 at.%), α-Fe/Nd₂Fe₁₄B type exchange-spring magnets, Nd-Fe-Co-V-B system alloys, magnetic properties, Spark Plasma Sintering (SPS) method, bulk exchange-spring magnets

JOURNAL FREE ACCESS

2002 Volume 49 Issue 2 Pages 141-145

DOI https://doi.org/10.2497/jjspm.49.141

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Abstract

Magnetic properties and structures of low rare-earth content (Nd=2-7at.%) α-Fe/Nd₂e₁₄B type Nd-Fe-Co-V-B system bulk exchange-spring magnets prepared by the Spark Plasma Sintering (SPS) method were investigated. In this range of Nd content, the bulk magnets showed the same magnetic properties as those of the annealed ribbons used as the raw materials. The saturation magnetization and soft/hard phase ratio corresponded with the estimated values. However, the exchange coupling strength decreased conspicuously with a lower Nd content presumably as a result of an increase in the grain size.

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