Domain Structures across the Martensitic Transformation in Ni2+xMn1-xGa

Abstract:

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Evolution of domain structures across the martensitic transition (Tm) in the ferromagnetic shape memory alloy system Ni-Mn-Ga is studied using an optical microscope with a temperature variation. Compositions chosen have Tm < Tc, Tm = Tc and Tm > Tc, (Tc=Curie temperature) so that one can compare the nature of martensitic domains. There are no appreciable domain structures when Tm < Tc as compared to the one with Tm > Tc. However, giant morphological changes in the form of appearance of well-developed domains that are propagating with different directions are seen for the composition in which Tm=Tc. The results are discussed in the light of Magnetic Force Microscopy observations as well as giant entropy changes known to occur on samples with co-occurrence of Tm and Tc.

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Periodical:

Edited by:

V. A. Chernenko and J. M. Barandiaran

Pages:

69-74

DOI:

10.4028/www.scientific.net/MSF.635.69

Citation:

D. Jain et al., "Domain Structures across the Martensitic Transformation in Ni2+xMn1-xGa", Materials Science Forum, Vol. 635, pp. 69-74, 2010

Online since:

December 2009

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