Studies on the exchange and dipolar couplings in Nd2Fe14B/α-Fe

R. Justin Joseyphus, A. Narayanasamy, L. Varga, B. Jeyadevan

Research output: Contribution to journalArticle

Abstract

The exchange coupling between Nd2Fe14B/α-Fe phases is investigated for Nd10Fe85B5 and Nd11Fe80B9 melt spun ribbons. The exchange coupling is present in Nd10Fe85B5 ribbons when the grain size of the α-Fe phase is as high as 30 nm due to better inter-grain interaction. The exchange coupling is enhanced when the exchange length increases due to the reduction in the value of magnetocrystalline anisotropy constant which is verified by dM measurements at various temperatures. The as-spun nanocomposite ribbons show both exchange and dipolar couplings, whereas annealing results in an increase in the strength of the exchange coupling due to the removal of grain boundary anisotropy as demonstrated from δM studies.

Original languageEnglish
Pages (from-to)70-74
Number of pages5
JournalZeitschrift fuer Metallkunde/Materials Research and Advanced Techniques
Volume99
Issue number1
DOIs
Publication statusPublished - Jan 1 2008

Fingerprint

Exchange coupling
ribbons
Magnetocrystalline anisotropy
anisotropy
Ion exchange
Nanocomposites
Grain boundaries
Anisotropy
Annealing
nanocomposites
grain boundaries
grain size
annealing
Temperature
interactions

Keywords

  • Exchange coupling
  • Exchange spring
  • Henkel plot
  • Nd- Fe -B
  • Permanent magnets

ASJC Scopus subject areas

  • Metals and Alloys

Cite this

Studies on the exchange and dipolar couplings in Nd2Fe14B/α-Fe. / Joseyphus, R. Justin; Narayanasamy, A.; Varga, L.; Jeyadevan, B.

In: Zeitschrift fuer Metallkunde/Materials Research and Advanced Techniques, Vol. 99, No. 1, 01.01.2008, p. 70-74.

Research output: Contribution to journalArticle

Joseyphus, R. Justin ; Narayanasamy, A. ; Varga, L. ; Jeyadevan, B. / Studies on the exchange and dipolar couplings in Nd2Fe14B/α-Fe. In: Zeitschrift fuer Metallkunde/Materials Research and Advanced Techniques. 2008 ; Vol. 99, No. 1. pp. 70-74.
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