Inelastic neutron scattering measurements on Nd2Fe14B single crystals

Mayer, H. M.; Steiner, Michael; Stüβer, N.; Weinfurter, Harald; Kakurai, Kazuhisa; Dörner, B.; Lindgård, Per‐Anker; Hock, Stefan; Rodewald, W.

doi:10.1016/0304-8853(91)90183-b

Cited by 16 publications

(5 citation statements)

References 24 publications

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“…The experimental dispersion curve 22 is parabolic at small wave numbers, ⑀ϭ⑀ 0 ϩDq 2 , with Dϭ2.5ϫ10 Ϫ29 erg cm 2 . Then, the exchange stiffness is given by 23 Aϭ(1/2)D(S/⍀)ϭ1.0ϫ10 Ϫ6 erg/cm, where S/⍀ϭ7.8ϫ10 22 cm Ϫ3 is the spin density. Application of this value of A to DyFe 11 Ti is justified by the fact that the Curie points of Nd 2 Fe 14 B and DyFe 11 Ti are close ͑588 and 534 K, respectively 24 ͒ and the exchange stiffness of iron-rich magnets appears to be proportional to the T C , cf.…”

Section: Ac Susceptibility Due To Dwmmentioning

confidence: 92%

“…Since no such data for DyFe 11 Ti are available in literature, we shall evaluate A for Nd 2 Fe 14 B. The experimental dispersion curve 22 is parabolic at small wave numbers, ⑀ϭ⑀ 0 ϩDq 2 , with Dϭ2.5ϫ10 Ϫ29 erg cm 2 . Then, the exchange stiffness is given by 23 Aϭ(1/2)D(S/⍀)ϭ1.0ϫ10 Ϫ6 erg/cm, where S/⍀ϭ7.8ϫ10 22 cm Ϫ3 is the spin density.…”

Section: Ac Susceptibility Due To Dwmmentioning

confidence: 99%

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ac susceptibility of aDyFe11Ti single crystal

et al. 1996

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A study of the ac initial magnetic susceptibility of a roughly spherical single crystal of DyFe 11 Ti is reported. Both the real and imaginary parts of the complex susceptibility have been measured in absolute units along the principal crystallographic directions, the results being practically identical for ͓100͔ and ͓110͔. The underlying mechanisms-coherent magnetization rotation and domain-wall motion-are considered. It is demonstrated that the thermally activated domain-wall displacements provide the clue to understanding the main features of the temperature dependence of both the real and imaginary parts of the observed susceptibility.

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Section: Ac Susceptibility Due To Dwmmentioning

confidence: 92%

Section: Ac Susceptibility Due To Dwmmentioning

confidence: 99%

ac susceptibility of aDyFe11Ti single crystal

et al. 1996

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“…Inelastic neutron scatterings (INSs) on R 2 Fe 14 B (R = Nd, Y) were interpreted in the frame of a classical spin wave model (Mayer et al 1991(Mayer et al , 1992. The acoustic magnon dispersion for Nd 2 Fe 14 B is mainly determined by the Fe-Fe exchange at least for low qvalues.…”

Section: Exchange Interactionsmentioning

confidence: 99%

Permanent magnets based on R-Fe-B and R-Fe-C alloys

Burzo

1998

Rep. Prog. Phys.

210

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A review is given on the basic properties of 2:14:1 hard magnetic phases as well as technological procedures used for manufacturing R-Fe-B and R-Fe-C permanent magnets. First, we analyse the phase diagrams, crystal structure of hard magnetic phases and composition ranges in which these phases form solid solutions, as a result of various types of substitution. Then, the magnetic properties of R 2 Fe 14 B-, R 2 Fe 14 C-and R 2 Co 14 Bbased compounds are described. The routes used for manufacturing R-Fe-B and R-Fe-C permanent magnets are detailed. The magnets' microstructure as well as their coercivities are described in correlation with composition and manufacturing routes. The properties of nanostructure magnets are then presented. Finally, the stability of Nd-Fe-B and Nd-Fe-C magnets in various working conditions is analysed.

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“…Therefore, many researchers in both experimental and theoretical have studied the thermal properties of K u [13][14][15][16][17][18]. However, regarding A for Nd 2 Fe 14 B, experimentally, the values are observed only at several temperatures [19][20][21][22], and also there is no theoretical estimation of the temperature dependence as far as we know.…”

Section: Introductionmentioning

confidence: 99%

Anisotropy of exchange stiffness based on atomic-scale magnetic properties in the rare-earth permanent magnetNd2Fe14B

Toga¹,

Nishino²,

Miyashita³

et al. 2018

Phys. Rev. B

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We examine the anisotropic properties of the exchange stiffness constant, A, for rare-earth permanent magnet, Nd2Fe14B, by connecting analyses with two different scales of length, i.e., Monte Carlo (MC) method with an atomistic spin model and Landau-Lifshitz-Gilbert (LLG) equation with a continuous magnetic model. The atomistic MC simulations are performed on the spin model of Nd2Fe14B constructed from ab-initio calculations, and the LLG micromagnetics simulations are performed with the parameters obtained by the MC simulations. We clarify that the amplitude and the thermal property of A depend on the orientation in the crystal, which are attributed to the layered structure of Nd atoms and weak exchange couplings between Nd and Fe atoms. We also confirm that the anisotropy of A significantly affects the threshold field for the magnetization reversal (coercivity) given by the depinning process.

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Inelastic neutron scattering measurements on Nd2Fe14B single crystals

Cited by 16 publications

References 24 publications

ac susceptibility of aDyFe11Ti single crystal

ac susceptibility of aDyFe11Ti single crystal

Permanent magnets based on R-Fe-B and R-Fe-C alloys

Anisotropy of exchange stiffness based on atomic-scale magnetic properties in the rare-earth permanent magnetNd2Fe14B

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