Size Effects in Hysteresis of Electrochemically Deposited Ni-Mn-Sn Heusler Alloy Films
22 Pages Posted: 27 Mar 2019 First Look: Preprint
Understanding the effect of small characteristic length scales on phase transformations requires microscopic observations to identify mechanisms which may influence the progression of the transformation. Here, we report thickness-dependent hysteresis in electrochemically deposited Ni-Mn-Sn Heusler alloy films, as observed by optical microscopy. This approach allows for analyzing size dependent phase transformation behavior within individual grains from films with decreasing thickness. Hysteresis is not correlated with grain size, but increases with decreasing film thickness following a power law relationship. This behavior is attributable to internal friction-induced energy dissipation at the film-substrate interface in microscale alloy films.
Keywords: Size effects, Martensitic transformation, Thermal hysteresis, Magnetocaloric effect, Heusler Alloy.
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