TITLE

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

AUTHOR(S)
Heczko, O.; Thomas, M.; Niemann, R.; Schultz, L.; Fähler, S.
PUB. DATE
April 2009
SOURCE
Applied Physics Letters;4/13/2009, Vol. 94 Issue 15, p152513
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
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.
ACCESSION #
37831798

 

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