3d-4f magnetic interactions and crystalline electric field in the R2Fe14B compounds : Magnetization measurements and Mössbauer study of Gd2Fe14B

Bogé, M.; Coey, J. M. D.; Czjzek, G.; Givord, D.; Jeandey, C.; Li, H.S.; Oddou, Jean-Louis

doi:10.1016/0038-1098(85)90611-8

Cited by 78 publications

(11 citation statements)

References 7 publications

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“…The best-fit values of the other adjustable parameters, B ex ͑0͒ = 270 T and M Fe ͑0͒ = 31.9 B / f.u., are rather close to those found in Ref. 3, B ex ͑0͒ = 276 T and M Fe ͑0͒ =32 B / f.u.…”

Section: Resultssupporting

confidence: 74%

“…3 The crystals were oriented by Laue x-ray diffraction and shaped using spark erosion. The Y 2 Fe 14 B single crystal was a 2 mm diameter sphere whereas the G 2 Fe 14 B single crystal was a 3.5 mm cube with edges along the ͓001͔, ͓100͔, and ͓010͔ crystallographic directions.…”

Section: Methodsmentioning

confidence: 99%

“…This seemed to have confirmed the often professed view that, apart from a slight rescaling, the iron sublattice magnetization M Fe ͑T / T C ͒ in both compounds is basically the same. The maximum value of B ex , corresponding to T → 0, was determined to be 276 T. 3 A problem with this interpretation arose a decade later, when an inelastic neutron scattering experiment found in Gd 2 Fe 14 B a significantly larger exchange field, B ex = 318 T at T =14 K. 4 ͑The same experiment 4 demonstrated that the exchange fields seen by Gd atoms situated on the two nonequivalent sites in Gd 2 Fe 14 B differ by no more than a few percent so that it is a valid approximation to consider just one exchange field acting on all Gd atoms.͒ It will be demonstrated below that the discrepancy is a manifestation of the falsity of the assumption made in Ref. The quantity under study herein is spontaneous magnetization.…”

Section: Introductionmentioning

confidence: 99%

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Why the iron magnetization in Gd2Fe14B and the spontaneous magnetization of Y2Fe14B depend on temperature differently

Kuz’min¹,

Givord

Skumryev

2010

Journal of Applied Physics

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It is demonstrated that the temperature dependence of the iron sublattice magnetization in Gd2Fe14B is affected significantly by the Gd–Fe exchange interaction. This is at variance with the common perception that MFe(T) in iron-rich rare-earth intermetallics is determined predominantly by the Fe–Fe exchange. This phenomenon is discussed by considering the modification of the low-energy spin-wave spectrum of Gd2Fe14B, as compared to that of Y2Fe14B, under the influence of the Gd–Fe interaction. The result is of particular significance for evaluating the temperature dependence of the magnetocrystalline anisotropy of iron or cobalt compounds with anisotropic rare earths (e.g., Nd2Fe14B) and in turn, of the hard magnetic properties of such compounds.

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Section: Resultssupporting

confidence: 74%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Why the iron magnetization in Gd2Fe14B and the spontaneous magnetization of Y2Fe14B depend on temperature differently

Kuz’min¹,

Givord

Skumryev

2010

Journal of Applied Physics

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“…However, has a strong temperature dependence and monotonically declines with increasing temperature [2]- [6]. In contrast, for Y Fe B, a smaller from the Fe lattice exhibits a weak temperature dependence which initially rises above room temperature before decreasing as the Curie temperature is approached.…”

Section: Resultsmentioning

confidence: 84%

“…The anisotropy of R Fe B (R Nd, and Dy) [2]- [6] arises from the large RE moment with an orbital angular moment which results in large crystal field splittings. However, has a strong temperature dependence and monotonically declines with increasing temperature [2]- [6].…”

Section: Resultsmentioning

confidence: 99%

Studies of New YDy-Based<tex>$hboxR_2hboxFe_14hboxB$</tex>Magnets for High Temperature Performance<tex>$(hboxR=hboxY+hboxDy+hboxNd)$</tex>

Tang

Dennis

et al. 2004

IEEE Trans. Magn.

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The effect of Nd substitution on microstructure and magnetic properties in [Nd x (YDy) 0 5(1 x) ] 2 2 Fe 14 B ribbons melt-spun at 22 m/s has been systematically studied. As-spun ribbons with low Nd content consist of 2 : 17 and 2 : 14 : 1 phases in an amorphous matrix, while as-spun ribbons with high Nd contain 2 : 14 : 1 and Fe phases in the amorphous matrix. After annealing at 700 C for 15 min, all of the ribbons exhibit only a single 2 : 14 : 1 phase in their X-ray diffraction patterns. Nd substitution can improve the maximum energy product of annealed ribbons but deteriorate the temperature stability of the ribbons. Increasing Nd (x) from 0 to 0.8, decreases coercivity from 22 to 13.5 kOe, but increases the maximum energy product from 5.87 to 11.2 MGOe. The temperature coefficients for remanence and coercivity increase from 0.045 C to 0.106 % C, and 0.306 to 0.38 % C, respectively for the same substitution range.Transmission electron microscope microstructures show that the samples with less Nd content exhibit a more uniform distribution of grains. Their average grain size is about 40 nm. The studied results show that the YDy-based R 2 Fe 14 B magnets are very promising for high-temperature performance.Index Terms-Magnetocrystalline anisotropy, melting spinning, permanent magnets, rare earth materials and compounds.

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Rare Earth Magnetocrystalline Anisotropy in R2Fe14B (R = Sm, Er, Tm, Yb)

Luong

Thuy

Tai

et al. 1989

Phys. Stat. Sol. (a)

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By using a simple Hamiltonian of a combined crystal field and exchange field model good theoretical fits are made to the observed rare earth anisotropy constants K 1R in a wide temperature range and the correct values of the spin reorientation temperature in R2Fe14B (R = Sm, Er, Tm, and Yb) are reproduced. The obtained crystal field and exchange field parameters are analyzed and compared with available data.

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3d-4f magnetic interactions and crystalline electric field in the R2Fe14B compounds : Magnetization measurements and Mössbauer study of Gd2Fe14B

Cited by 78 publications

References 7 publications

Why the iron magnetization in Gd2Fe14B and the spontaneous magnetization of Y2Fe14B depend on temperature differently

Why the iron magnetization in Gd2Fe14B and the spontaneous magnetization of Y2Fe14B depend on temperature differently

Studies of New YDy-Based<tex>$hboxR_2hboxFe_14hboxB$</tex>Magnets for High Temperature Performance<tex>$(hboxR=hboxY+hboxDy+hboxNd)$</tex>

Rare Earth Magnetocrystalline Anisotropy in R2Fe14B (R = Sm, Er, Tm, Yb)

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3d-4f magnetic interactions and crystalline electric field in the R2Fe14B compounds : Magnetization measurements and Mössbauer study of Gd2Fe14B

Cited by 78 publications

References 7 publications

Why the iron magnetization in Gd2Fe14B and the spontaneous magnetization of Y2Fe14B depend on temperature differently

Why the iron magnetization in Gd2Fe14B and the spontaneous magnetization of Y2Fe14B depend on temperature differently

Studies of New YDy-Based&lt;tex&gt;$hboxR_2hboxFe_14hboxB$&lt;/tex&gt;Magnets for High Temperature Performance&lt;tex&gt;$(hboxR=hboxY+hboxDy+hboxNd)$&lt;/tex&gt;

Rare Earth Magnetocrystalline Anisotropy in R2Fe14B (R = Sm, Er, Tm, Yb)

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Studies of New YDy-Based<tex>$hboxR_2hboxFe_14hboxB$</tex>Magnets for High Temperature Performance<tex>$(hboxR=hboxY+hboxDy+hboxNd)$</tex>