Shape memory and ferromagnetic shape memory effects in single-crystal Ni 2 MnGa thin filmsOff-stoichiometric Ni 2 MnGa polycrystalline films, deposited by the flash-evaporation technique on the heated mica substrates, show a martensitic phase transformation at 310 K. At room temperature, the films have a tetragonal structure (aϭbϭ0.598 nm, cϭ0.576 nm) close to the bulk Ni 2 MnGa with c/aϭ0.96. The austenite to martensite transformation brings about an anomalous minimum in the effective magnetization and a strong increase in the ferromagnetic resonance linewidth in the martensitic phase just below the transformation temperature. The results are discussed in terms of a qualitative model that combines the ferromagnetic resonance response with a specific microstructure of the polycrystalline Ni 2 MnGa film.
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