Magnetic hysteresis in rapidly quenched rare-earth alloys

R. C. Hazelton, G. C. Hadjipanayis, K. R. Lawless, David J Sellmyer

Research output: Contribution to journalArticle

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Abstract

The magnetic and structural properties of rapidly quenched (Pr80Ga20)100-xFex, RTbFe and RTbFe(Co)M alloys are examined over a wide range of chemical compositions, where R ≡ Pr, Sm, MM and M ≡ B and Si. The Ga-containing samples show relatively high coercive fields (up to 3 kOe) in the amorphous state which subsequently disappear after crystallization. On the other hand, the high coercive fields (≈5 kOe) of melt-spun RTbFe samples decrease slightly after crystallization but their magnetic moment increases substantially. Melt-spun RTbFe(Co)M samples are generally magnetically soft in the as-quenched state. Magnetic hardening is produced by annealing the samples around 750°C leading to coercive fields which could not be measured with an ordinary electromagnet (Hc #62; 23 kOe). The best properties have been obtained on a Pr14Fe71B15 sample with a coercive field of 8 kOe and an energy product of 8.5 MGOe. Thermomagnetic data show that a structural transformation takes place upon heating the samples to 750°C. The Curie temperature of the precipitate phase is around 320°C while that of the as-quenched phase is around 160°C. Transmission electron microscope studies show a very fine precipitate structure with a precipitate size below 100 Å. The precipitate phase is believed to be highly anisotropic leading to the observed hard magnetic properties.

Original languageEnglish (US)
Pages (from-to)278-286
Number of pages9
JournalJournal of Magnetism and Magnetic Materials
Volume40
Issue number3
DOIs
StatePublished - Jan 1 1984

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Rare earth alloys
rare earth alloys
Magnetic hysteresis
Precipitates
hysteresis
precipitates
Crystallization
Magnetic properties
Electromagnets
Curie temperature
Magnetic moments
crystallization
magnetic properties
Hardening
Structural properties
electromagnets
Electron microscopes
Annealing
Heating
hardening

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Magnetic hysteresis in rapidly quenched rare-earth alloys. / Hazelton, R. C.; Hadjipanayis, G. C.; Lawless, K. R.; Sellmyer, David J.

In: Journal of Magnetism and Magnetic Materials, Vol. 40, No. 3, 01.01.1984, p. 278-286.

Research output: Contribution to journalArticle

Hazelton, R. C. ; Hadjipanayis, G. C. ; Lawless, K. R. ; Sellmyer, David J. / Magnetic hysteresis in rapidly quenched rare-earth alloys. In: Journal of Magnetism and Magnetic Materials. 1984 ; Vol. 40, No. 3. pp. 278-286.
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