Record Details

Magnetocaloric properties, exchange bias, and critical behavior of Ge substituted Ni50Mn36Sn14 Heusler alloys

DSpace at IIT Bombay

View Archive Info
 
 
Field Value
 
Title Magnetocaloric properties, exchange bias, and critical behavior of Ge substituted Ni50Mn36Sn14 Heusler alloys
 
Creator RAJI, GR
UTHAMAN, B
THOMAS, S
SURESH, KG
VARMA, MR
 
Subject MAGNETIC ENTROPY CHANGE
INDUCED SHAPE RECOVERY
NI-MN-SB
ROOM-TEMPERATURE
MARTENSITIC TRANSITION
TRANSFORMATION
 
Description The effect of Ge substitution on the magnetic, magnetocaloric, and exchange bias properties of Heusler alloy system Ni50Mn36Sn14-xGex (x = 1, 2) has been investigated. With the increase of Ge content, the cell volume decreases due to the smaller Ge radius and the martensitic transition temperature increases, while the Curie temperature of the austenite phase shows a small decrease. Metamagnetic behavior is observed in the low temperature magnetization isotherms for x = 1, whereas it is less pronounced in x = 2. The maximum magnetic entropy changes associated with the martensitic transition are 7.8 J/kg K and 2.3 J/kg K for x = 1 and 2, respectively, for a field change of 5 T. Relative cooling power is found to be more in the vicinity of the Curie temperature of the austenite phase, compared to that at the martensitic transition temperature in both x = 1 and 2. At low temperatures, both the samples exhibit exchange bias effect, with x = 2 showing higher value of exchange bias field. This is ascribed to the coexistence of ferromagnetic and antiferromagnetic interactions in these alloys. Further, the critical behavior of the austenite phase of both the alloys is studied and the values of the critical exponents are found to be different from the mean field values, which is attributed to the magnetic inhomogeneity originated due to Ge substitution. (C) 2015 AIP Publishing LLC.
 
Publisher AMER INST PHYSICS
 
Date 2016-01-15T07:40:35Z
2016-01-15T07:40:35Z
2015
 
Type Article
 
Identifier JOURNAL OF APPLIED PHYSICS, 117(10)
0021-8979
1089-7550
http://dx.doi.org/10.1063/1.4914527
http://dspace.library.iitb.ac.in/jspui/handle/100/18074
 
Language en