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Relationship between the magnetocaloric effect and sequential magnetic phase transitions in Ni-Mn-Ga alloys

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5 Author(s)
Zhou, XueZhi ; Department of Physics and Astronomy, University of Manitoba, Winnipeg, Manitoba, Canada, R3T 2N2 ; Li, Wei ; Kunkel, H.P. ; Williams, Gwyn
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The fundamental nature of the magnetic phase transitions in the Ni-Mn-Ga system is investigated quantitatively. By compositional tuning, the first-order metamagnetic/martensitic structural transition (occurring at TM≈200 K in the parent compound Ni2MnGa) and the second-order/continuous transition (at TC≈375 K in the parent) can be merged. This occurs for Ni55.2Mn18.6Ga26.2, where the entropy changes by ΔSM=-20.4 J kg-1 K-1 (in a field of 5 T near 317 K), at a transition that displays both first- and second-order characteristics simultaneously.

Published in:

Journal of Applied Physics  (Volume:97 ,  Issue: 10 )

Date of Publication:

May 2005

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