DocumentCode :
1450725
Title :
Magnetoelasticity of Fe _{100-x} Ge _{x}(5 \\ll x \\ll 18) Single Crystals From 81 K to 300 K
Author :
Petculescu, G. ; LeBlanc, J.B. ; Wun-Fogle, M. ; Restorff, J.B. ; Burton, W.C. ; Cao, J.X. ; Wu, R.Q. ; Yuhasz, W.M. ; Lograsso, T.A. ; Clark, A.E.
Author_Institution :
Phys. Dept., Univ. of Louisiana, Lafayette, LA, USA
Volume :
45
Issue :
10
fYear :
2009
Firstpage :
4149
Lastpage :
4152
Abstract :
Temperature dependent magnetoelastic properties of Fe 100 - xGex(5 < x < 18) single crystals have been measured. Tetragonal magnetostriction (3/2) lambda100 measurements at x = 5.7, 12.1, 14.9, and 17.7 were performed between 78 K and 426 K and resonant ultrasound spectroscopy measurements were used to determine the shear elastic constant c´ from 5 K to 300 K for x = 6.4, 7.2, 10.8, 14.6, 17.7 , and 17.9 . A clear distinction was observed between the temperature dependencies of lambda100 for the A2 and D03 phases of Fe100-xGex . The elastic constant c´ displays a monotonic decrease with concentration through the different phases (6 < x < 18) and at all temperatures. Experimental values of the tetragonal magnetoelastic coupling constant -b 1 at 81 K were remarkably consistent with theoretical values determined by density functional calculations at 0 K.
Keywords :
density functional theory; elastic constants; germanium alloys; iron alloys; magnetoelastic effects; magnetostriction; Fe100-xGe; density functional calculations; resonant ultrasound spectroscopy measurements; shear elastic constant; single crystal; temperature 426 K; temperature 81 K to 300 K; temperature dependent magnetoelastic properties; tetragonal magnetoelastic coupling constant; tetragonal magnetostriction; Elastic constants; gallium alloys; germanium alloys; iron alloys; magnetoelasticity; magnetostriction;
fLanguage :
English
Journal_Title :
Magnetics, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9464
Type :
jour
DOI :
10.1109/TMAG.2009.2025969
Filename :
5257241
Link To Document :
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