Correlating structure with ferromagnetism in melt-spun Gd100-xFex

TitleCorrelating structure with ferromagnetism in melt-spun Gd100-xFex
Publication TypeJournal Article
Year of Publication2011
AuthorsShand PM, Schmitter DC, Rojas G, Shield JE, Goertzen J, Meyer AL, Pekarek TM, Kramer MJ, Leslie-Pelecky DL
Journal TitleJournal of Alloys and Compounds
Date Published02
Type of ArticleArticle
ISBN Number0925-8388
Accession NumberISI:000287058100071
Keywordsalloys, COERCIVITY, crystallization behavior, curie-temperature, fe, ferromagnetism, films, GADOLINIUM, Gadolinium-iron alloy, magnetic-properties, NANOCRYSTALLINE, nanocrystalline gd, transition

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 T-c. 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. (C) 2010 Elsevier B.V. All rights reserved.

URL<Go to ISI>://000287058100071
Alternate JournalJ. Alloy. Compd.