Magnetoelasticity of Nd2Fe14B and Y2Fe14B

Shiga, M.; Kusakabe, Yoshihiko; Nakamura, Yoji; Makita, K.; Sagawa, M.

doi:10.1016/0921-4526(89)90135-x

Cited by 14 publications

(4 citation statements)

References 6 publications

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“…Our target is to obtain the MEL parameters M α 12 and M α 22 . However nothing is known about the elastic stiffness constants C α ii for Y 2 Fe 14 B; we only dispose of the elastic bulk, B, and shear, G, moduli as determined for polycrystalline samples [23]. It can be shown that the symmetry elastic constants are related to them in the way C α are the result of the fits of the thermal variations of α,1 and α,2 , although we started the fits with some parameters (R, B 20 , B 44 , 0 and 1 and α), previously found for the also axial itinerant iron-rich ferromagnet Y 2 Fe 17 [2].…”

Section: Resultsmentioning

confidence: 99%

Pure crystal field -mode magnetostriction of the itinerant ferromagnet

Abadı́a

Moral

Kułakowski

et al. 1999

J. Phys.: Condens. Matter

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We have experimentally isolated the pure single-ion crystal-field origin irreducible magnetostrictive strains and , which respectively represent the volume and the shape ratio distortions, for the tetragonal itinerant ferromagnet . The unusual thermal variations of those strains, peaking at about 200 K and decreasing with temperature, have no sensible explanation within the Callen-Callen standard theory of magnetostriction for localized magnetic moments. Instead a developed simple rigid-band Stoner model of magnetostriction for itinerant 3d electrons explains quite well such dependencies and also allows us to extract the microscopic magnetoelastic coupling parameters and , accounting for those strains respectively. These parameters are very large, about atom, and of opposite signs.

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Section: Resultsmentioning

confidence: 99%

Pure crystal field -mode magnetostriction of the itinerant ferromagnet

Abadı́a

Moral

Kułakowski

et al. 1999

J. Phys.: Condens. Matter

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“…These authors separated a single-ion crystal field and exchange contributions to the strictions. The ordinary E effect has been shown only in the shear modulus of the Nd 2 Fe 14 B below 150 K but not in Y 2 Fe 14 B (Shiga et al 1989). A softening in the longitudinal modulus was observed for both compounds below T c , which is explained as an inverse effect of the volume magnetostriction.…”

Section: Exchange Interactionsmentioning

confidence: 87%

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

Burzo

1998

Rep. Prog. Phys.

208

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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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“…According to current theory, decreases because spin fluctuations are suppressed by the external magnetic field. 6,26 However, the lowtemperature behavior of (H) can be explained neither by spin fluctuation theory nor by classical magnetoresistance mechanisms. We attribute most of the variation of the resistivity with magnetic field to magnetization-dependent scattering mechanisms.…”

Section: A Electrical Resistivitymentioning

confidence: 99%

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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Magnetoelasticity of Nd2Fe14B and Y2Fe14B

Cited by 14 publications

References 6 publications

Pure crystal field -mode magnetostriction of the itinerant ferromagnet

Pure crystal field -mode magnetostriction of the itinerant ferromagnet

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

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

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Magnetoelasticity of Nd2Fe14B and Y2Fe14B

Cited by 14 publications

References 6 publications

Pure crystal field -mode magnetostriction of the itinerant ferromagnet

Pure crystal field -mode magnetostriction of the itinerant ferromagnet

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

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

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