Abstract
We report the kinetics of twin-boundary motion in the ferromagnetic shape-memory alloy of Ni-Mn-Ga as measured by in situ high energy synchrotron diffraction. The temporal evolution of twin reorientation during the application of a magnetic field is described by thermally activated creep motion of twin boundaries over a distribution of energy barriers. The dynamical creep exponent $\ensuremath{\mu}$ was found to be $\ensuremath{\sim}0.5$, suggesting that the distribution of energy barriers is a result of short-range disorders.
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