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High spin polarization and spin splitting in equiatomic quaternary CoFeCrAl Heusler alloy

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Title High spin polarization and spin splitting in equiatomic quaternary CoFeCrAl Heusler alloy
 
Creator BAINSLA, L
MALLICK, AI
COELHO, AA
NIGAM, AK
VARAPRASAD, BSDCS
TAKAHASHI, YK
ALAM, A
SURESH, KG
HONO, K
 
Subject MAGNETIC-PROPERTIES
FERROMAGNETS
Heusler alloys
Half metallic ferromagnet
Spintronics
ab-initio calculation
PCAR
 
Description In this paper, we investigate CoFeCrAl alloy by means of ab-initio electronic structure calculations and various experimental techniques. The alloy is found to exist in the B2-type cubic Heusler structure, which is very similar to Y-type (or LiMgPdSn prototype) structure with space group F-43m (#216). Saturation magnetization (M-S) of about 2 mu(B)/f.u. is observed at 8 K under ambient pressure, which is in good agreement with the Slater-Pauling rule. M-S values are found to be independent of pressure, which is a prerequisite for half-metals. The ab-initio electronic structure calculations predict half-metallicity for the alloy with a spin slitting energy of 0.31 eV. Importantly, this system shows a high current spin polarization value of 0.67 +/- 0.02, as deduced from the point contact Andreev reflection measurements. Linear dependence of electrical resistivity with temperature indicates the possibility of reasonably high spin polarization at elevated temperatures (similar to 150 K) as well. All these suggest that CoFeCrAl is a promising material for the spintronic devices. (C) 2015 Elsevier B.V. All rights reserved.
 
Publisher ELSEVIER SCIENCE BV
 
Date 2016-01-14T14:30:40Z
2016-01-14T14:30:40Z
2015
 
Type Article
 
Identifier JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 394,82-86
0304-8853
1873-4766
http://dx.doi.org/10.1016/j.jmmm.2015.05.095
http://dspace.library.iitb.ac.in/jspui/handle/100/17731
 
Language en