Magnetic properties and crystal structure of Nd2Fe14B

Givord, D.; Li, H.S.; Moreau, Jean-Michel

doi:10.1016/0038-1098(84)90315-6

Cited by 403 publications

(52 citation statements)

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“…Below 135 K, the contribution due to the domain-wall movement appears. In order to calculate contribution to Ј from the rotation of the magnetic moments, the anisotropy constants (K 1 zation measurements on single-crystalline Nd 2 Fe 14 B were used. By using Eq.…”

Section: Nd 2 Fe 14 B and Ho 2 Fe 14 Bmentioning

confidence: 99%

ac susceptibility study onR2Fe14Bsingle crystals (
Kou
¹
,
Größinger
²
,
Hilscher
³

et al. 1996
Phys. Rev. B
35
2
15
0
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The temperature dependence of the ac susceptibility ϭЈϩiЉ has been measured on R 2 Fe 14 B single crystals with RϭY, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, and Tm as a function of temperature in the temperature interval from 4.2 to 300 K, as a function of the strength of the applied ac field ͑up to 800 A/m͒, as a function of frequency ͑ranging from 5 to 1000 Hz͒, as well as the dependence on the crystallographic orientation. A reversible rotation of magnetic moments, excited by applying the field perpendicular to the easy magnetization direction, is found to be the principal contribution to the susceptibility (Ј). The energy loss is fairly small in this case (ЉϷ0). When the external field is applied parallel to the easy magnetization direction, domain-wall movement is the main contribution to the susceptibility (Ј) and to the energy loss (Љ). For Nd 2 Fe 14 B, a peak in Љ(T) is detected at 135 K, the spin-reorientation temperature, in a 5 Hz field of 40 A/m applied along the ͓001͔ direction. This peak disappears upon increasing the frequency or upon changing the crystallographic orientation of the crystal. In addition, an anomaly in the temperature dependence of the susceptibility is detected around 220 K for R 2 Fe 14 B single crystals with RϭPr, Nd, Sm, Tb, and Dy. The presence of this anomaly depends on the crystallographic orientation. It can only be detected when the external field is applied parallel to the ͓001͔ direction. For all frequencies used, the temperature dependence of Ј is completely different from that of Љ. The Ј values are nearly independent of the frequency in our measuring range from 5 to 1000 Hz. However, the Љ values increase with increasing frequency when the field is applied along the easy magnetization direction and decrease when the field is applied perpendicular to the easy magnetization direction. ͓S0163-1829͑96͒06233-9͔

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Section: Nd 2 Fe 14 B and Ho 2 Fe 14 Bmentioning

confidence: 99%

ac susceptibility study onR2Fe14Bsingle crystals (
Kou
¹
,
Größinger
²
,
Hilscher
³

et al. 1996
Phys. Rev. B
35
2
15
0
View full text Add to dashboard Cite

show abstract

“…The phase Nd 2 Fe 14 B has a tetragonal crystal structure with 68 atoms in the unit cell [6,7] Fe can be described in the model of six sextets corresponding to the six possible states of Fe atoms [8,9]. As the populations of the k 1 , k 2 , j 1 , j 2 , e, and c positions are respectively 16, 16,8,8,4, and 4 (56 iron atoms in total), the corresponding subspectra contribute to the total spectrum as 4:4:2:2:1:1.…”

Section: Resultsmentioning

confidence: 99%

Mössbauer study of treated Nd₂Fe₁₄B

et al. 2015

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Abstract. The Nd 2 Fe 14 B cylindrical magnets were treated with water solutions of alkali, acid, and salt. Möss-bauer spectroscopy was applied to study the composition and properties of the surface material of the treated magnets. It is shown that the main phase of the permanent Nd 2 Fe 14 B magnet partly decomposes. The released -Nd at the grain boundaries interacts with water and forms neodymium hydroxide matrix, and the released Fe diffuses into it. The presence of Fe-Nd(OH) 3 is refl ected in the paramagnet doublet in the Mössbauer spectra of treated neodymium magnets.

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“…Small single-crystalline samples of Nd 2 Fe 14 B were simply obtained by Hukin-type cold-crucible induction melting of alloys from high-purity elements (Nd: 99.9%, Fe: 99.99%, B: 99.99%). Crystals (0.3 mm in diameter) were observed to grow in shrinkage cavities obtained after slow cooling of the melt under vacuum (Givord, Li and Moreau, 1984). From the intensities of Laue photographs of these single-crystalline samples the tetragonal structure of the Nd 2 Fe 14 B phase was revealed.…”

Section: Crystal Growth Of R 2 Fe 14 B Compounds For High-performancementioning

confidence: 97%

Crystal Growth of Magnetic Materials

Behr

Löser

2007

Handbook of Magnetism and Advanced Magnetic Materials

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In this chapter, the various methods for crystal growth of magnetic materials are summarized and principles of choosing the appropriate growth method, which depends on phase diagram features of the alloy system, the required size, physical, and chemical perfection of single crystalline samples, are briefly discussed. The crystal growth of the following classes of materials is considered: soft magnetic pure metals and alloys, highly anisotropic compounds for high‐density magnetic recording media, rare earth–transition metal compounds for high‐performance permanent magnets, high‐magnetostrictive intermetallic compounds and ferromagnetic shape memory alloys for magnetomechanical applications, magnetocaloric materials, selected intermetallic compounds for spintronics, multiferroic materials, and some other less‐common magnetic compounds.

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Magnetic properties and crystal structure of Nd2Fe14B

Cited by 403 publications

References 0 publications

ac susceptibility study onR2Fe14Bsingle crystals (
Kou
¹
,
Größinger
²
,
Hilscher
³

et al. 1996
Phys. Rev. B
35
2
15
0
View full text Add to dashboard Cite

ac susceptibility study onR2Fe14Bsingle crystals (
Kou
¹
,
Größinger
²
,
Hilscher
³

et al. 1996
Phys. Rev. B
35
2
15
0
View full text Add to dashboard Cite

Mössbauer study of treated Nd₂Fe₁₄B

Crystal Growth of Magnetic Materials

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Magnetic properties and crystal structure of Nd2Fe14B

Cited by 403 publications

References 0 publications

ac susceptibility study onR2Fe14Bsingle crystals (Kou1, Größinger2, Hilscher3 et al. 1996Phys. Rev. B352150View full textAdd to dashboardCite

ac susceptibility study onR2Fe14Bsingle crystals (Kou1, Größinger2, Hilscher3 et al. 1996Phys. Rev. B352150View full textAdd to dashboardCite

Mössbauer study of treated Nd2Fe14B

Crystal Growth of Magnetic Materials

Contact Info

Product

Resources

About

ac susceptibility study onR2Fe14Bsingle crystals (
Kou
¹
,
Größinger
²
,
Hilscher
³

et al. 1996
Phys. Rev. B
35
2
15
0
View full text Add to dashboard Cite

ac susceptibility study onR2Fe14Bsingle crystals (
Kou
¹
,
Größinger
²
,
Hilscher
³

et al. 1996
Phys. Rev. B
35
2
15
0
View full text Add to dashboard Cite

Mössbauer study of treated Nd₂Fe₁₄B