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Observation of enhanced exchange bias behaviour in NiCoMnSb Heusler alloys

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Title Observation of enhanced exchange bias behaviour in NiCoMnSb Heusler alloys
 
Creator NAYAK, AK
SURESH, KG
NIGAM, AK
 
Description We report the observation of large exchange bias (EB) in Ni(50-)xCo(x)Mn(38)Sb(12) Heusler alloys with x = 0, 2, 3, 4, 5, which is attributed to the coexistence of ferromagnetic (FM) and antiferromagnetic (AFM) phases in the martensitic phase. The phase coexistence is possibly due to the supercooling of the high temperature FM phase and the predominant AFM component in the martensitic phase. The presence of EB is well supported by the observation of the training effect. The EB field increases with Co concentration. The maximum value of 480 Oe at T = 3K is observed in x = 5 after field cooling in 50 kOe, which is almost double the highest value reported so far in any Heusler alloy system. Increase in the AFM coupling after Co substitution is found to be responsible for the increase in the EB.
 
Publisher IOP PUBLISHING LTD
 
Date 2011-08-03T22:21:20Z
2011-12-26T12:54:25Z
2011-12-27T05:42:18Z
2011-08-03T22:21:20Z
2011-12-26T12:54:25Z
2011-12-27T05:42:18Z
2009
 
Type Article
 
Identifier JOURNAL OF PHYSICS D-APPLIED PHYSICS, 42(11), -
0022-3727
http://dx.doi.org/10.1088/0022-3727/42/11/115004
http://dspace.library.iitb.ac.in/xmlui/handle/10054/9159
http://hdl.handle.net/10054/9159
 
Language en