Temperature Dependent Elasticity of a Ni2MnGa Film as Measured by Impulsive Stimulated Scattering

3rd International Symposium on Laser Ultrasonics and Advanced Sensing

Sermeus, J.^1 ; Verstraeten, B.^1 ; Stoklasova, P.^2 ; Landa, M.^2 ; Glorieux, C.^1

Laboratory for Acoustics and Thermal Physics, Department of Physics and Astronomy, KU Leuven, Celestijnenlaan 200D, 3001 Heverlee, Belgium^1

Institute of Thermomechanics, Academy of Sciences of the Czech Republic, Dolejskova 5, 182 00 Prague 8, Czech Republic^2

关键词: Characterization tools;    Coating-substrate;    MgO substrate;    Ni2MnGa;    Stimulated scattering;    Surface acoustic waves;    Temperature dependent;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/520/1/012013/pdf
DOI  :  10.1088/1742-6596/520/1/012013

来源: IOP

【 摘 要 】

We report the results of an impulsive stimulated scattering measurement conducted on a 550 nm film of Ni2MnGa on a MgO substrate, aiming at the direct experimental observation of the highly temperature dependent elasticity. The phase velocity of the surface acoustic waves excited on the surface of the coating-substrate shows an anomaly around the phase transition temperature of Ni2MnGa, showing that it is possible to use impulsive stimulated scattering as a characterization tool to determine temperature dependent elasticity of a thin film.