1987
DOI: 10.1063/1.338725
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Dependence of coercivity on the anisotropy field in the Nd2Fe14B-type sintered magnets

Abstract: The temperature dependence of the coercivity (HcI)of Nd15(Fe1−xCox)77B8 and (Nd1−xDyx)15Fe77B8 sintered magnets and that of the saturation magnetization (Ms) and the anisotropy field (HA) of Nd2(Fe1−xCox)14B and (Nd1−xDyx)2Fe14B single crystals have been observed in the temperature range between 295 and 800 K. The dependence of the coercivity on the major magnetic properties of the matrix phase in the Nd-Fe-B based magnets are investigated using the μ0HA vs μ0HcI+Ms plot. It is demonstrated that this method of… Show more

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Cited by 178 publications
(47 citation statements)
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“…1 Its main hard magnetic phase is Nd 2 Fe 14 B, which has a saturation magnetization (l 0 M S ) of 1.6 T and an anisotropy field (l 0 H A ) of $7.5 T at room temperature. [2][3][4] The weak point of this compound is its low Curie temperature of $312°C and the large degradation of anisotropy field with temperature. 3 Therefore, Nd-Fe-B ternary magnets cannot be used for the applications in which the operation temperature increases during service.…”
Section: Introductionmentioning
confidence: 99%
See 1 more Smart Citation
“…1 Its main hard magnetic phase is Nd 2 Fe 14 B, which has a saturation magnetization (l 0 M S ) of 1.6 T and an anisotropy field (l 0 H A ) of $7.5 T at room temperature. [2][3][4] The weak point of this compound is its low Curie temperature of $312°C and the large degradation of anisotropy field with temperature. 3 Therefore, Nd-Fe-B ternary magnets cannot be used for the applications in which the operation temperature increases during service.…”
Section: Introductionmentioning
confidence: 99%
“…Hence, all commercial magnets being used for the traction motors of (hybrid) electric vehicles and wind turbines contain a substantial amount of Dy to enhance the anisotropy field of the R 2 Fe 14 B compound, where R could be Nd, Pr, Dy, or Tb. 4,5 Because of the scarcity of the natural resources of heavy rare earth elements (HREs) such as Dy and Tb, there is a strong research interest in developing high-performance magnets free from HREs and even with a lower content of rare-earth elements. 6,7 PERMANET MAGNET COMPOUNDS Figure 1 shows the anisotropy field l 0 H A and onefourth of the square of the saturation magnetization l 0 M s 2 /4, which is the upper limit of the maximum energy product that can be attained if H c > M s /2 and M r = M s for perfect anisotropy magnets, where M r is the remanent magnetization.…”
Section: Introductionmentioning
confidence: 99%
“…Nd-Fe-B sintered magnets [1][2][3] have the largest maximum energy product among the current magnets and have been widely used for magnetic devices such as voice coil motors in magnetic recording systems. Recently, because of the rapidly growing interest in electric vehicles, much effort has been made to suppress the degradation of the coercivity (H c ) of Nd-Fe-B magnets.…”
mentioning
confidence: 99%
“…Moreover, the substitution of Dy for Nd in Nd 2 Fe 14 B results in a linear increase in H A and a corresponding linear decrease in M s . [7][8][9][10] Since the magnetic property is sensitive to the electronic structure, a preliminary speculation is proposed that the electronic structure in the (Nd 1−x Dy x ) 2 Fe 14 B system would be in a linear variation. The purpose of our work is to confirm this speculation.…”
Section: Introductionmentioning
confidence: 99%