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

doi:10.1016/j.jallcom.2010.11.185

Correlating structure with ferromagnetism in melt-spun Gd _100-xFe_x

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

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Abstract

X-ray diffraction and transmission electron microscopy measurements of melt-spun Gd_100-xFe_x (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.

Original language	English (US)
Pages (from-to)	3000-3005
Number of pages	6
Journal	Journal of Alloys and Compounds
Volume	509
Issue number	6
DOIs	https://doi.org/10.1016/j.jallcom.2010.11.185
State	Published - Feb 10 2011

Bibliographical note

Funding Information:
This work was supported by the National Science Foundation ( DMR-0504706 (UNL), DMR-0504177 (UNI) and DMR-0706593 (UNF)) and the US Department of Energy ( DE-FG02-06ER46264 ). Work at the Ames Laboratory was supported by the Department of Energy, Office of Basic Energy Sciences, under Contract no. DE-AC02-07CH11358.

Keywords

Coercivity
Ferromagnetism
Gadolinium-iron alloy
Nanocrystalline

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10.1016/j.jallcom.2010.11.185

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title = "Correlating structure with ferromagnetism in melt-spun Gd 100-xFex",

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.",

keywords = "Coercivity, Ferromagnetism, Gadolinium-iron alloy, Nanocrystalline",

author = "Shand, {P. M.} and Schmitter, {D. C.} and G. Rojas and Shield, {J. E.} and J. Goertzen and Meyer, {A. L.} and Pekarek, {T. M.} and Kramer, {M. J.} and Leslie-Pelecky, {D. L.}",

note = "Funding Information: This work was supported by the National Science Foundation ( DMR-0504706 (UNL), DMR-0504177 (UNI) and DMR-0706593 (UNF)) and the US Department of Energy ( DE-FG02-06ER46264 ). Work at the Ames Laboratory was supported by the Department of Energy, Office of Basic Energy Sciences, under Contract no. DE-AC02-07CH11358.",

year = "2011",

month = feb,

day = "10",

doi = "10.1016/j.jallcom.2010.11.185",

language = "English (US)",

volume = "509",

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AU - Shand, P. M.

AU - Schmitter, D. C.

AU - Rojas, G.

AU - Shield, J. E.

AU - Goertzen, J.

AU - Meyer, A. L.

AU - Pekarek, T. M.

AU - Kramer, M. J.

AU - Leslie-Pelecky, D. L.

N1 - Funding Information: This work was supported by the National Science Foundation ( DMR-0504706 (UNL), DMR-0504177 (UNI) and DMR-0706593 (UNF)) and the US Department of Energy ( DE-FG02-06ER46264 ). Work at the Ames Laboratory was supported by the Department of Energy, Office of Basic Energy Sciences, under Contract no. DE-AC02-07CH11358.

PY - 2011/2/10

Y1 - 2011/2/10

N2 - 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.

AB - 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.

KW - Coercivity

KW - Ferromagnetism

KW - Gadolinium-iron alloy

KW - Nanocrystalline

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