Mean field analysis of exchange coupling in amorphous DyFe2-B alloy ribbons

J. M. Lee, J. K. Jung, Sang Ho Lim

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Experimental magnetization-temperature curves for melt-spun ribbons of amorphous alloys (Dy0.33Fe0.67)1-xBx with x = 0, 0.05, 0.1 and 0.15 (in atomic fraction) are fitted with theoretical equations based on the mean field theory in order to investigate exchange couplings between constituent elements as a function of the B content. The sign of the exchange coupling between Dy and Fe is negative, indicating that the magnetization direction of Dy is antiparallel to that of Fe. The sign of the other two couplings are positive. The exchange coupling between Fe ions are greatest, while that between Dy ions is negligible. The exchange couplings between Fe ions, and between Dy and Fe increase with increasing B content, the increase of the latter being much greater than the former. Resultantly, the exchange coupling between Dy and Fe becomes about one half of that between Fe ions at the highest B content. The increase of the exchange coupling between Fe ions may be explained by the increase of the Fe-Fe separation with the increase of the B content. The total magnetization is dominated by the Dy sublattice magnetization. As the B content increases, the magnetization decreases over the whole temperature range, and the Curie temperature also decreases.

Original languageEnglish
Pages (from-to)133-141
Number of pages9
JournalJournal of Magnetism and Magnetic Materials
Volume234
Issue number1
DOIs
Publication statusPublished - 2001 Aug 1
Externally publishedYes

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Exchange coupling
ribbons
Magnetization
Ions
magnetization
ions
Mean field theory
Amorphous alloys
Curie temperature
sublattices
Temperature
temperature
curves

Keywords

  • Amorphous alloys
  • B effects
  • Exchange interactions
  • Mean field theory

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Mean field analysis of exchange coupling in amorphous DyFe2-B alloy ribbons. / Lee, J. M.; Jung, J. K.; Lim, Sang Ho.

In: Journal of Magnetism and Magnetic Materials, Vol. 234, No. 1, 01.08.2001, p. 133-141.

Research output: Contribution to journalArticle

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