Inelastic neutron scattering measurements on Nd2Fe14B and Y2Fe14B single crystals

Mayer, H. M.; Steiner, Michael; Stüβer, N.; Weinfurter, Harald; Dörner, B.; Lindgård, Per‐Anker; Hock, Stefan; Verhoef, R.

doi:10.1016/0304-8853(92)90590-k

Cited by 17 publications

(3 citation statements)

References 8 publications

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“…On the other hand, inelastic neutron scattering experiments done on Nd 2 Fe 14 B alloys show additional magnon modes which involve spins of both rare-earth and iron ions. 22 Our result and the fact that Nd 2 Fe 14 B and Y 2 Fe 14 B have nearly the same spin-wave stiffness constant indicate that the Fe-Fe mode starts at a lower energy than the acoustic R-Fe mode in Nd 2 Fe 14 B. 23 It may also be so for the Tm compound, although the value of the coefficient A for Tm 2 Fe 14 B is 70% larger than that for Y 2 Fe 14 B.…”

Section: A Electrical Resistivitymentioning

confidence: 53%

Magnetotransport properties through phase transitions inR2Fe14B
Stankiewicz
¹
,
Bartolomé
²
,
Hirosawa³
2001
Phys. Rev. B

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The electrical resistivity and Hall effect of Y 2 Fe 14 B single crystals have been measured over the temperature range of 4 -700 K in magnetic fields of up to 5 T. From these and previous results, which we obtained for Nd 2 Fe 14 B and Tm 2 Fe 14 B single crystals, we draw some general conclusions about R 2 Fe 14 B alloys. The overall behavior of the resistivity is determined mainly by Fe atoms; however, contributions from rare-earth atoms are clearly observed at low temperatures. Large variations of the Hall resistivity are found near the spin reorientation and Curie temperatures. They can be attributed to critical magnetization fluctuations which enhance skew scattering in these regions. We calculate spin fluctuations making use of a phenomenological molecularfield model for an anisotropic ferromagnet. Our calculations account quite well for the observed anomalies in the spontaneous Hall coefficient. Away from the critical regions, side-jump scattering of charge carriers seems to be responsible for the Hall effect.

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Section: A Electrical Resistivitymentioning

confidence: 53%

Magnetotransport properties through phase transitions inR2Fe14B
Stankiewicz
¹
,
Bartolomé
²
,
Hirosawa³
2001
Phys. Rev. B

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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 and Y2Fe14B single crystals

Cited by 17 publications

References 8 publications

Magnetotransport properties through phase transitions inR2Fe14B
Stankiewicz
¹
,
Bartolomé
²
,
Hirosawa³
2001
Phys. Rev. B

Magnetotransport properties through phase transitions inR2Fe14B
Stankiewicz
¹
,
Bartolomé
²
,
Hirosawa³
2001
Phys. Rev. B

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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Inelastic neutron scattering measurements on Nd2Fe14B and Y2Fe14B single crystals

Cited by 17 publications

References 8 publications

Magnetotransport properties through phase transitions inR2Fe14BStankiewicz1, Bartolomé2, Hirosawa3 2001Phys. Rev. B

Magnetotransport properties through phase transitions inR2Fe14BStankiewicz1, Bartolomé2, Hirosawa3 2001Phys. Rev. B

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

Contact Info

Product

Resources

About

Magnetotransport properties through phase transitions inR2Fe14B
Stankiewicz
¹
,
Bartolomé
²
,
Hirosawa³
2001
Phys. Rev. B

Magnetotransport properties through phase transitions inR2Fe14B
Stankiewicz
¹
,
Bartolomé
²
,
Hirosawa³
2001
Phys. Rev. B