Magnetically induced martensite transition in freestanding epitaxial Ni–Mn–Ga films

Heczko, O.; Thomas, M.; Niemann, R.; Schultz, L.; Fähler, S.
April 2009
Applied Physics Letters;4/13/2009, Vol. 94 Issue 15, p152513
Academic Journal
The martensitic transformation in freestanding Ni–Mn–Ga films obtained by epitaxial growth on NaCl (001) is analyzed. A temperature-magnetic field phase diagram reveals that the martensitic phase, exhibiting a higher magnetization compared to austenite, is favored by an external field. A shift of martensite temperature of dT/dH=0.36 K/T is observed, in good agreement with the value expected from a Clausius–Clapeyron equation. The practicality and energy input for actuation using magnetically induced martensitic transition is compared with a magnetically induced reorientation of martensitic variants.


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