Size dependence of soft to hard magnetic transition in (Nd, Pr)-fe-al bulk amorphous alloys

Akira Takeuchi, Akihisa Inoue

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)

Abstract

Magnetic properties of (Nd, Pr)60-70Fe30-20Al10 amorphous alloys were studied for bulk specimens prepared by arc-melting. The bulk specimens with thicknesses ranging from 100μm to 6mm were prepared as fragments, which were obtained by crashing a mother alloy followed by arc melting. The bulk specimens exhibit an amorphous state up to 6mm for Nd60Fe30Al10, 3mm for Nd70Fe20Al10, 6mm for Pr60Fe30Al10 and 1mm for Nd70Fe20Al10. Bulk specimens with thicknesses ranging from 100μm to 6mm exhibit hard magnetism with coercive force (iHc) ranging from 100 to 300kA/m. The iHc of the bulk specimens tends to decrease with decreasing thickness. It is estimated that the soft to hard magnetic transition takes place approximately 100μm for (Nd, Pr)70Fe20Al10 amorphous alloys. The critical cooling rate for the formation of amorphous phase is estimated as less than 100K/s for (Nd, Pr)60-70Fe30-20 Al10 alloys from the analyses using thermodynamic quantities.

Original languageEnglish
Pages (from-to)1140-1144
Number of pages5
JournalMaterials Science and Engineering A
Volume375-377
Issue number1-2 SPEC. ISS.
DOIs
Publication statusPublished - 2004 Jul 1

Keywords

  • Arc melting
  • Bulk amorphous alloy
  • Critical cooling rate
  • Magnetic properties
  • Nd-Fe-Al alloy
  • Pr-Fe-Al alloy

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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