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Giant inverse magnetocaloric effect near room temperature in Co substituted NiMnSb Heusler alloys

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Title Giant inverse magnetocaloric effect near room temperature in Co substituted NiMnSb Heusler alloys
 
Creator NAYAK, AK
SURESH, KG
NIGAM, AK
 
Description The effect of Co on the structural, magnetic and magnetocaloric effect (MCE) of Ni(50-x) Co(x)Mn(38)Sb(12) (x = 0, 2, 3, 4, 5) Heusler alloys was studied. Using x-ray diffraction, we show the evolution of the martensitic phase from the austenite phase. The martensitic transition temperature is found to decrease monotonically with Co concentration. Remarkable enhancement of MCE is observed near room temperature upon Co substitution. The maximum magnetic entropy change of 34 J kg(-1) K(-1) was achieved for x = 5 at 262K in a field of 50 kOe and a value of 29 J kg(-1) K(-1) was found near room temperature. The significant increase in the magnetization with large magneto-structural coupling associated with the reverse martensitic transition is responsible for the giant MCE in these compounds.
 
Publisher IOP PUBLISHING LTD
 
Date 2011-08-03T18:40:46Z
2011-12-26T12:54:20Z
2011-12-27T05:42:03Z
2011-08-03T18:40:46Z
2011-12-26T12:54:20Z
2011-12-27T05:42:03Z
2009
 
Type Article
 
Identifier JOURNAL OF PHYSICS D-APPLIED PHYSICS, 42(3), -
0022-3727
http://dx.doi.org/10.1088/0022-3727/42/3/035009
http://dspace.library.iitb.ac.in/xmlui/handle/10054/9117
http://hdl.handle.net/10054/9117
 
Language en