Beneficial effect of the substitution of Co for Fe on the magnetic properties of melt-spun Pr2Fe14C/α-Fe-type nanocomposite magnets

Zhang, W.Y.; Chang, H. W.; Chiu, Chien‐Liang; Han, Jingquan; Chang, W.C.

doi:10.1016/j.jallcom.2004.02.024

Cited by 8 publications

(4 citation statements)

References 12 publications

(13 reference statements)

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“…the addition of Co and Ti and the higher B content which either promoted the formation of Nd 2 Fe 14 B or resulted in the grain refinement and homogenization of crystallized microstructure in the samples. Such crystallization acceleration and grain growth inhibition effects have also been widely reported in other references [15][16][17][18][19]. Moreover, the magnetic hardening for NFe20 has been observed for furnace annealing at 500˚C, while no detectable coercivity appears for RTP sample.…”

Section: Resultssupporting

confidence: 75%

Rapid magnetic hardening by rapid thermal annealing in NdFeB-based nanocomposites

Chu¹,

Jin²,

Chakka³

et al. 2005

J. Phys. D: Appl. Phys.

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A systematic study of heat treatments and magnetic hardening of NdFeB-based melt-spun nanocomposite ribbons have been carried out. Comparison was made between samples treated by rapid thermal annealing and by conventional furnace annealing. Heating rates up to 200 K s −1 were adopted in the rapid thermal processing. It was observed that magnetic hardening can be realized in an annealing time as short as 1 s. Coercivity of 10.2 kOe in the nanocomposites has been obtained by rapid thermal annealing for 1 s, and prolonged annealing did not give any increase in coercivity. Detailed results on the effects of annealing time, temperature and heating rate have been obtained. The dependence of magnetic properties on the annealing parameters has been investigated. Structural characterization revealed that there is a close correlation between magnetic hardening and nanostructured morphology. The coercivity mechanism was also studied by analysing the magnetization minor loops.

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Section: Resultssupporting

confidence: 75%

Rapid magnetic hardening by rapid thermal annealing in NdFeB-based nanocomposites

Chu¹,

Jin²,

Chakka³

et al. 2005

J. Phys. D: Appl. Phys.

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“…Moreover, a major drawback of Nd-Fe-B magnet is the low Curie temperature T c and the poor thermal stability, which limits the useful operating temperatures of commercial magnets. The principal advantages of Co addition to Nd 2 Fe 14 B are increases in the Curie temperature T c of the 2:14:1 phase which may also be attractive for high operational temperature applications [3][4][5], and a possible increase in the saturation polarization J s arising from the higher J s of Nd 2 (FeCo) 14 B compared to that of pure Nd 2 Fe 14 B [6,7]. The heavy rare-earth elements like Dy and Tb may compensate decrease in the anisotropic field H A of Nd 2 Fe 14 B with the substitution of Co for Fe.…”

Section: Introductionmentioning

confidence: 99%

Exchange interactions and magnetization reversal of nanocrystalline (NdDyTb)12.3(FeZrNbCu)81.7B6.0 ribbons with Co substitution

Bao

Zhu

Gao

et al. 2009

Journal of Magnetism and Magnetic Materials

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“…So far, high-performance nanocomposite magnets have not been obtained with low rare-earth content because high coercivity has not been reached. Nonetheless, the effect of doping elements on the microstructure and magnetic properties of nanocomposite magnets has shown something remarkable [8,[12][13][14][15]. With a small amount of Cr and Co doping, a special microstructure, namely the cellular structure, was observed in α-Fe(Co)/Nd 2 Fe 14 B nanocomposite magnets [8].…”

Section: Introductionmentioning

confidence: 99%

Crystalline evolution and large coercivity in Dy-doped (Nd,Dy)₂Fe₁₄B/α-Fe nanocomposite magnets

Hoa

et al. 2006

J. Phys. D: Appl. Phys.

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Nanocomposite hard magnetic materials (Nd,Dy)4.5Fe77.5B18 (No. 1) and (Nd,Dy)4.5Fe76B18Nb1.2Cu0.3 (No. 2) have been prepared by crystallizing amorphous ribbons, fabricated by single roll melt-spinning. The evolution of a multiphase structure was monitored by an x-ray diffractometer and by thermomagnetic measurement. We observed that, at annealing temperatures below 670 °C, there is crystallization of soft phase Fe3B and a small amount of hard phase Nd2Fe14B. At annealing temperatures above 670 °C, crystallization of α-Fe and probably Dy2Fe14B phases with large magnetocrystalline anisotropy led to a drastic enhancement in the hard magnetic properties of the materials. The maximum value of HC is found to be 4.2 kOe for sample No. 1. For sample No. 2, with co-doping of Nb and Cu, nanostructure refinement yields a strong enhancement in exchange coupling between the component phases. Thereby, we obtained high reduced-remanence of 0.78, high remanence of 1.15 and a high (BH)max value up to 16.2 MGOe.

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Beneficial effect of the substitution of Co for Fe on the magnetic properties of melt-spun Pr2Fe14C/α-Fe-type nanocomposite magnets

Cited by 8 publications

References 12 publications

Rapid magnetic hardening by rapid thermal annealing in NdFeB-based nanocomposites

Rapid magnetic hardening by rapid thermal annealing in NdFeB-based nanocomposites

Exchange interactions and magnetization reversal of nanocrystalline (NdDyTb)12.3(FeZrNbCu)81.7B6.0 ribbons with Co substitution

Crystalline evolution and large coercivity in Dy-doped (Nd,Dy)₂Fe₁₄B/α-Fe nanocomposite magnets

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Beneficial effect of the substitution of Co for Fe on the magnetic properties of melt-spun Pr2Fe14C/α-Fe-type nanocomposite magnets

Cited by 8 publications

References 12 publications

Rapid magnetic hardening by rapid thermal annealing in NdFeB-based nanocomposites

Rapid magnetic hardening by rapid thermal annealing in NdFeB-based nanocomposites

Exchange interactions and magnetization reversal of nanocrystalline (NdDyTb)12.3(FeZrNbCu)81.7B6.0 ribbons with Co substitution

Crystalline evolution and large coercivity in Dy-doped (Nd,Dy)2Fe14B/α-Fe nanocomposite magnets

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Crystalline evolution and large coercivity in Dy-doped (Nd,Dy)₂Fe₁₄B/α-Fe nanocomposite magnets