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No.2(pp.27-68)

Home > Issues > Volume 9 (2004) > No.2(pp.27-68)

Ferromagnetic Resonance Observation of Martensitic Phase Transformation in Ni-Mn-Ga Ferromagnetic Shape Memory Films

Journal of Magnetics, Volume 9, Number 2, 30 Jun 2004, Pages 37-39

J Dubowik*

(Institute of Molecular Physics, Polish Academy of Sciences), Y.V. Kudryavtsev(Institute of Metal Physics, NANU), Y.P Lee(q-Psi and Depart. of Physics, Hanyang Univ.)

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 Ni₂MnGA 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

DOI:

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