  The modification of magnetic properties in spatially inhomogeneous epitaxial
films of magnetic shape memory alloys in martensitic state with the temperature
variation has been studied. The proposed theoretical model is based on Landau
theory of martensitic transformation and statistical model of martensitic
state. It was shown that that spatial inhomogeneity of the material leads to
the dispersion of local martensitic transformation temperatures resulting in
the variation of local magnetic anisotropy values. This model allows describing
the dramatic ferromagnetic resonance line broadening observed in the
experiments in epitaxial films of magnetic shape memory alloys at low
temperatures.
