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Magnetotransport properties through phase transitions in R2Fe14B (R=Y, Nd, Tm) compounds

Identifieur interne : 001F40 ( Main/Exploration ); précédent : 001F39; suivant : 001F41

Magnetotransport properties through phase transitions in R2Fe14B (R=Y, Nd, Tm) compounds

Auteurs : Jolanta Stankiewicz [Espagne, Japon] ; Juan Bartolome [Espagne] ; Satoshi Hirosawa [Espagne]

Source :

Physical review. B, Condensed matter and materials physics [ 1098-0121 ] ; 2001-09-01.

RBID : Pascal:01-0345504

Descripteurs français

Pascal (Inist)
- 7550B, 7215, Etude théorique, Etude expérimentale, Yttrium alliage, Néodyme alliage, Thulium alliage, Fer alliage, Magnétorésistance, Effet Hall, Résistivité électrique, Aimantation, Fluctuation spin, Matériau ferromagnétique.

English descriptors

KwdEn :
- Electrical resistivity, Experimental study, Ferromagnetic materials, Hall effect, Iron alloys, Magnetization, Magnetoresistance, Neodymium alloys, Spin fluctuations, Theoretical study, Thulium alloys, Yttrium alloys.

Abstract

The electrical resistivity and Hall effect of Y₂Fe₁₄B 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 Nd₂Fe₁₄B and Tm₂Fe₁₄B single crystals, we draw some general conclusions about R₂Fe₁₄B 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 molecular-field 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.

Affiliations:

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Le document en format XML

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<front><div type="abstract" xml:lang="en">The electrical resistivity and Hall effect of Y<sub>2</sub>
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Fe<sub>14</sub>
B single crystals, we draw some general conclusions about R<sub>2</sub>
Fe<sub>14</sub>
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 molecular-field 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.</div>
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Magnetotransport properties through phase transitions in R2Fe14B (R=Y, Nd, Tm) compounds

Magnetotransport properties through phase transitions in R2Fe14B (R=Y, Nd, Tm) compounds

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

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