Abstract
Ordered and disordered Ni2MnGa alloy films have been prepared by flash evaporation. We show that the ordered films are ferromagnetic and exhibit the same magnetic and transport properties as those of crystalline bulk Ni2MnGa with the martensite transformation near 200 K. The structural disorder in Ni2MnGa alloy films destroys the ferromagnetic order. The disordered Ni2MnGa films are shown to behave like a highly resistive Pauli paramagnet with a nearly linear negative temperature coefficient of resistivity. Annealing of the disordered films at 680 K restores the L21 structure and the magnetic and transport properties of the ordered state.
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