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首页> 外文期刊>Physica, B. Condensed Matter >Ultrafast reflectivity and electron dynamic properties of Tb0.27Dy0.73Fe2 thin films
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Ultrafast reflectivity and electron dynamic properties of Tb0.27Dy0.73Fe2 thin films

机译：Tb0.27Dy0.73Fe2薄膜的超快反射率和电子动力学性质

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摘要

The ultrafast optical properties and electron dynamics of Tb0.27Dy0.73Fe2 thin film were studied using the femtosecond pump-probe technology. Experimental results revealed that the extremum of Delta R/R curves corresponding to the electron thermalization occurred around 100fs, and with the decrease of thin film thickness, the average rate of reflectivity equilibration after extremum became faster. Amplitude of Delta R/R curves reach its maximum at 160 mW pump fluence and it turns zero at 0 mW. Echo waves were found in reflectivity, waveform and the smaller the thickness of the thin film, the earlier the echo occurs. Time variation of the complex dielectric constant indicates that the absorption of thin films became greater with the increase of reflection at the surface after 0 ps delay time, but absorption of the thin film recovered to its initial state after 1 ps.
机译：使用飞秒泵浦探针技术研究了Tb0.27Dy0.73Fe2薄膜的超快光学性能和电子动力学。实验结果表明，与电子热化相对应的ΔR/ R曲线的极值出现在100fs左右，随着薄膜厚度的减小，极值后平均反射率的平衡速度加快。 Delta R / R曲线的振幅在泵通量为160 mW时达到最大值，在0 mW时变为零。在反射率，波形中发现了回波，并且薄膜的厚度越小，回波就越早发生。复介电常数的时间变化表明，在0 ps延迟时间后，薄膜的吸收随表面反射的增加而增大，但在1 ps后薄膜的吸收恢复到初始状态。

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