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Effect of annealing on the magnetic, magnetocaloric and magnetoresistance properties of Ni-Co-Mn-Sb melt spun ribbons

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Title Effect of annealing on the magnetic, magnetocaloric and magnetoresistance properties of Ni-Co-Mn-Sb melt spun ribbons
 
Creator SAHOO, R
KUMAR, DMR
BABU, DA
SURESH, KG
NIGAM, AK
RAJA, MM
 
Subject Full Heusler alloy
Magnetocaloric effect
Martensite
Magnetoresistance
SHAPE-MEMORY ALLOYS
MARTENSITIC-TRANSFORMATION
TRANSITIONS
 
Description The structural, magnetic, magnetocaloric and magnetotransport properties of Ni46Co4Mn38Sb12 melt spun ribbons have been systematically investigated. The partially ordered B2 phase of the as-spun ribbon transforms to fully ordered L2(1) phase upon annealing, which signifies a considerable change of the atomic ordering in the system. The presence of atomic disorder in the as-spun ribbon gives rise to a higher martensitic transition temperature and a lower magnetization as compared to the bulk sample. However, annealing the ribbons helps in regaining the bulk properties to a large extent. Significant changes in magnetocaloric effect, exchange bias and magnetoresistance have been observed between the as-spun and the annealed ribbons, indicating the role of atomic ordering on the functional as well as fundamental properties in the Heusler system. Importantly, the study shows that one can reduce the hysteresis loss by preparing melt spun alloys and subjecting them to appropriate annealing conditions, which enable them to become practical magnetic refrigerants. (c) 2013 Elsevier B.V. All rights reserved.
 
Publisher ELSEVIER SCIENCE BV
 
Date 2014-10-15T10:46:24Z
2014-10-15T10:46:24Z
2013
 
Type Article
 
Identifier JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 34795-100
http://dx.doi.org/10.1016/j.jmmm.2013.07.027
http://dspace.library.iitb.ac.in/jspui/handle/100/14781
 
Language en