Magnetostriction of rapidly quenched Sm-Fe-B alloys

S. R. Kim, Sang Ho Lim

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

The magnetic and magnetostrictive properties of melt-spun ribbons of (Sm0.33Fe0.67)1-xBx (where x=0, 0.01, 0.02, 0.03 and 0.04) alloys are investigated as a function of wheel speed during melt-quenching using a single-roll technique. Contrary to the previous results on Dy-Fe and Tb-Fe based systems, the magnetostrictive characteristics seem to vary in a rather unexpected way, although the grain size decreases with wheel speed and an amorphous phase is formed at high wheel speeds and/or at high B contents, as expected. This is mainly because, for the alloys with x≤0.02, the absolute value of magnetostriction is exceptionally large for the ribbons fabricated at the wheel speed of 10 m s-1 (and also 20 m s-1 for the B-free alloy). The magnitude of magnetostriction of the present melt-spun Sm-Fe-B alloy ribbons is found to be small and also the sensitivity of magnetostriction is poor at low magnetic fields except for high wheel speeds and high B contents. The coercive force is observed to be well matched with the sensitivity of magnetostriction at low fields; good (poor) sensitivity is attained at low (high) Hc. Saturation magnetization does not vary with B content and is 66.2 emug-1 (at x=0.04 and 50 m s-1).

Original languageEnglish
Pages (from-to)163-168
Number of pages6
JournalJournal of Alloys and Compounds
Volume258
Issue number1-2
Publication statusPublished - 1997 Aug 1
Externally publishedYes

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Keywords

  • Amorphous structure
  • B addition
  • Giant magnetostriction
  • Rapid quenching
  • SmFe compound

ASJC Scopus subject areas

  • Metals and Alloys

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