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Effects of partial substitution by 5d heavy elements on the thermal transport in Fe_2 VAl thin films

机译：5d重元素部分取代对Fe_2 VAl薄膜热传递的影响

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摘要

The thermal transport properties of M/Fe_2(V, Ta)Al/A/ (M = Mo, W) multilayer thin films, which were epitaxially grown on the [100] MgO single-crystal substrates by means of a radio-frequency magnetron sputtering system, were systematically investigated using a picosecond pulsed laser heating time-domain thermoreflectance method. Not only the thermal diffusivity but also the boundary thermal resistance was strongly affected by both the Ta substitution for Vin Fe_2 VAl and the elements in the metallic layer of top and bottom sides. From the first-principles density-functional theory calculations, we found that such changes in heat transport properties were directly related to the intrinsic phonon dispersion. In the Fe_2(V, Ta)Al layer thickness region of less than 14 nm, the boundary thermal resistances of all thin-film series abruptly decreased with decreasing the thickness, which was due to the coherently ordered interfacial structure.
机译：M / Fe_2（V，Ta）Al / A /（M = Mo，W）多层薄膜的热传输性能，这些薄膜通过射频磁控管在[100] MgO单晶衬底上外延生长用皮秒脉冲激光加热时域热反射法系统地研究了溅射系统。 Ta替代Vin Fe_2 VAl以及顶部和底部金属层中的元素，不仅对热扩散系数而且对边界热阻都有很大影响。从第一原理密度泛函理论计算，我们发现这种传热特性的变化与固有声子色散直接相关。在小于14nm的Fe_2（V，Ta）Al层厚度区域中，所有薄膜系列的边界热阻都随着厚度的减小而突然减小，这是由于相干有序的界面结构所致。

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  • 来源
    《Physical review》 |2020年第10期|104312.1-104312.8|共8页
  • 作者

    Seongho Choi; Satoshi Hiroi; Manabu Inukai; Shunsuke Nishino; Robert Sobota; Dogyun Byeon; Masashi Mikami; Masaharu Matsunami; Tsunehiro Takeuchi;

  • 作者单位

    Toyota Technological Institute 2-12-1 Hisakata Tempaku-ku Nagoya Aichi468-8511 Japan;

    National Institute for Materials Science 1-1-1 Koto Sayo Sayo Hyogo 679-5148 Japan;

    National Institute of Advanced Industrial Science and Technology 2266-98 Anagahora Shimoshidami Moriyama-ku Nagoya Aichi 463-8560 Japan;

    Toyota Technological Institute 2-12-1 Hisakata Tempaku-ku Nagoya Aichi468-8511 Japan CREST Japan Science and Technology Agency Tokyo 102-0076 Japan Institute of Innovation for Future Society Nagoya University Nagoya 464-8603 Japan;

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