Correlating structure with ferromagnetism in melt-spun Gd 100-xFex

P. M. Shand, D. C. Schmitter, G. Rojas, J. E. Shield, J. Goertzen, A. L. Meyer, T. M. Pekarek, M. J. Kramer, D. L. Leslie-Pelecky

Research output: Contribution to journalArticlepeer-review

Abstract

X-ray diffraction and transmission electron microscopy measurements of melt-spun Gd100-xFex (0 x 40) and inert-gas condensed/compacted samples (3.8 x 12.7) reveal a structure of crystalline hcp-Gd grains surrounded by a non-crystalline Gd1-xeffFexeff phase, where x eff > x is the effective iron concentration within the amorphous region. The two-phase structure is responsible for an unusual dependence of the coercivity on temperature in which non-zero coercivity is observed above the hcp-Gd Tc with a peak near 320 K. The coercivity decreases as the hcp-Gd grains order, then increases with decreasing temperature. This behavior is explained by the presence of magnetically correlated Fe-rich regions.

Original languageEnglish (US)
Pages (from-to)3000-3005
Number of pages6
JournalJournal of Alloys and Compounds
Volume509
Issue number6
DOIs
StatePublished - Feb 10 2011

Keywords

  • Coercivity
  • Ferromagnetism
  • Gadolinium-iron alloy
  • Nanocrystalline

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