Journal of Magnetics

The Korean Magnetics Society (한국자기학회)
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Ferromagnetic Resonance Observation of Martensitic Phase Transformation in Ni-Mn-Ga Ferromagnetic Shape Memory Films

  • Dubowik, J. (Institute of Molecular Physics, Polish Academy of Sciences) ;
  • Kudryavtsev, Y.V. (Institute of Metal Physics, NAN) ;
  • Lee, Y.P (q-Psi and Depart. of Physics, Hanyang Univ.)
  • Published : 2004.06.01
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Abstract

Polycrystalline Ni-Mn-Ga films have been deposited onto mica substrates held at 720 K by flash-evaporation method. At room temperature the films have a tetragonal structure with a = b = 0.598 and c = 0.576 nm typical for bulk $Ni_2MnGa$ below a martensitic transformation. Temperature measurements of ferromagnetic resonance reveal a martensitic phase transformation at 310 K. The transformation brings about a substantial decrease in the effective magnetization and a drastic increase in the ferromagnetic resonance linewidth due to a strong increase in the magnetic anisotropy in the martensitic phase.

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