Implications of twinning kinetics on the frequency response in NiMnGa actuators
The explicit kinetic relation for twin wall motion in NiMnGa is used to correlate basic material
properties to magneto-mechanical actuation rates in these crystals. In particular, we identify
two parameters: the Peierls energy barrier and the twin wall mobility, which directly
determine the dynamic response of NiMnGa actuators at frequencies above 10 Hz.
Comparison between the kinetics of type I and type II twin walls reveals a correlation
between the Peierls energy barrier and the commonly used twinning stress property …
properties to magneto-mechanical actuation rates in these crystals. In particular, we identify
two parameters: the Peierls energy barrier and the twin wall mobility, which directly
determine the dynamic response of NiMnGa actuators at frequencies above 10 Hz.
Comparison between the kinetics of type I and type II twin walls reveals a correlation
between the Peierls energy barrier and the commonly used twinning stress property …