Magnetic and Microstructural Characteristics of Nd-Fe-B Sintered Magnets Doped With Dy 2O 3 and DyF 3 Powders

Magnetic and microstructural properties of (Nd 26.06 , Dy 6.51 )-Fe bal. -B 0.97 -M 2.39 (wt.%) ( M = Cu, Al, Co, and Nb) sintered magnets doped with Dy 2 O 3 and DyF 3 powders were studied. In the case of the Dy 2 O 3 -doped magnet, Dy was distributed along the near grain boundaries. In contrast, t...

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Published inIEEE transactions on magnetics Vol. 47; no. 10; pp. 3259 - 3262
Main Authors Park, Song-E., Kim, Tae-Hoon, Lee, Seong-Rae, Kim, Dong-Hwan, Nam-Kung, Seok, Jang, Tae-Suk
Format Journal Article
LanguageEnglish
Published IEEE 01.10.2011
Subjects
Coercive force
Dy _{2} O _{3}
DyF _{3} doping
Grain boundaries
magnetic property
Magnetic resonance imaging
Magnetic tunneling
microstructure
Nd-Fe-B sintered magnets
Neodymium
Perpendicular magnetic anisotropy
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Summary:Magnetic and microstructural properties of (Nd 26.06 , Dy 6.51 )-Fe bal. -B 0.97 -M 2.39 (wt.%) ( M = Cu, Al, Co, and Nb) sintered magnets doped with Dy 2 O 3 and DyF 3 powders were studied. In the case of the Dy 2 O 3 -doped magnet, Dy was distributed along the near grain boundaries. In contrast, the DyF 3 -doped magnet and the undoped magnet showed that Dy was distributed uniformly in the main phase. The coercivity and the remanence of the Dy 2 O 3 and DyF 3 -doped magnets were 33.2 kOe, 11.64 kG, and 34.5 kOe, 11.21 kG, respectively. The coercivity of the DyF 3 -doped magnet was the largest but its remanence was the smallest among other magnets because the Dy was distributed throughout the main phase. Uniform distribution of the Dy in the DyF 3 -dopedmagnet was probably due to their lower bonding energy and higher chemical potential for diffusion.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2011.2153833