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http://dx.doi.org/10.4283/JMAG.2004.9.2.037

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.)

Publication Information

Journal of Magnetics / v.9, no.2, 2004 , pp. 37-39 More about this Journal

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.

Keywords

ferromagnetic shape memory alloys; thin films; ferromagnetic resonance;

Citations & Related Records

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