Martensitic transformation in Ni2MnGa films: A ferromagnetic resonance study

Off-stoichiometric Ni2MnGa 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 (a=b=0.598 nm, c=0.576 nm) close to the bulk Ni2MnGa with c/a=0.9...

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Bibliographic Details
Published in:Journal of applied physics 2004-03, Vol.95 (5), p.2912-2917
Main Authors: Dubowik, J., Kudryavtsev, Y. V., Lee, Y. P.
Format: Article
Language:English
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Summary:Off-stoichiometric Ni2MnGa 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 (a=b=0.598 nm, c=0.576 nm) close to the bulk Ni2MnGa with c/a=0.96. 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 Ni2MnGa film.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.1641956