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Local structure studies of CoFeMnX (X = Si and Ge) Heusler alloys using X-ray absorption spectroscopy

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Title Local structure studies of CoFeMnX (X = Si and Ge) Heusler alloys using X-ray absorption spectroscopy
 
Creator BAINSLA, L
YADAV, AK
VENKATESWARA, Y
JHA, SN
BHATTACHARYYA, D
SURESH, KG
 
Subject Spin gapless semiconductor
Heusler alloys
half-metallic ferromagnetic
EXAFS
 
Description In this paper, we report the local structure studies in CoFeMnX (X = Si and Ge) Heusler alloys using extended X-ray absorption fine structure (EXAFS) measurements. CoFeMnGe (CFMG) is found to exist in a well-ordered LiMgPdSn structure, while a large amount of antisite disorder is observed for CoFeMnSi (CFMS). CFMG is half-metallic ferromagnetic in nature, while CFMS is a spin gapless semiconductor (SGS). The presence of well-ordered crystal structure is an essential requirement to obtain high spin polarization in half-metallic materials, while SGS materials are supposed to be robust against chemical disorder. The fact that CFMS shows a high spin polarization of 64% even when having a high degree of disorder confirms that the SGS materials are robust against structural disorder. (C) 2015 Elsevier B.V. All rights reserved.
 
Publisher ELSEVIER SCIENCE SA
 
Date 2016-01-14T14:15:46Z
2016-01-14T14:15:46Z
2015
 
Type Article
 
Identifier JOURNAL OF ALLOYS AND COMPOUNDS, 651,509-513
0925-8388
1873-4669
http://dx.doi.org/10.1016/j.jallcom.2015.08.131
http://dspace.library.iitb.ac.in/jspui/handle/100/17703
 
Language en