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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
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
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