Interfacial thermal transport in spin caloritronic material systems
Interfacial thermal transport in spin caloritronic material systems
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DOI：
10.1103/physrevmaterials.5.114403
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发表时间：
2021-11-11
影响因子：
3.4
通讯作者：
Wilson, Richard B.
中科院分区：
文献类型：
--
作者：
Angeles, Frank;Sun, Qiyang;Wilson, Richard B.
界面通常控制纳米器件和纳米结构材料的热性能。因此，准确的热界面传导的知识是必要的，以模拟纳米器件或纳米结构材料的加热的温度响应。在这里，我们报告的金属和绝缘体，通常用于自旋热电子实验之间的热边界电导。我们使用时域热反射来测量金属（例如Au、Pt、Ta、Cu和Al）与石榴石和氧化物衬底之间的界面电导，例如，NiO、钇铁石榴石（YIG）、铥铁石榴石（TmIG）、Cr2 O3和蓝宝石。我们发现，在室温下，在这些类型的材料系统的界面电导范围从50到300 MW m（-2）K-1。在80 ~ 350 K温度范围内，我们还测量了Pt和YIG之间的界面电导。室温下，Pt/YIG的界面电导为170 MWm（-2）K-1，Kapitza长度约为40 nm。40 nm的Kapitza长度意味着，在存在稳态热流的情况下，Pt/YIG界面处的温度降等于跨越40 nm厚的YIG层的温度降。在80 K时，Pt/YIG的界面电导为60 MWm（-2）K-1，对应的Kapitza长度约为300 nm。
Interfaces often govern the thermal performance of nanoscale devices and nanostructured materials. As a result, accurate knowledge of thermal interface conductance is necessary to model the temperature response of nanoscale devices or nanostructured materials to heating. Here, we report the thermal boundary conductance between metals and insulators that are commonly used in spin-caloritronic experiments. We use time-domain thermoreflectance to measure the interface conductance between metals such as Au, Pt, Ta, Cu, and Al with garnet and oxide substrates, e.g., NiO, yttrium iron garnet (YIG), thulium iron garnet (TmIG), Cr2O3, and sapphire. We find that, at room temperature, the interface conductance in these types of material systems range from 50 to 300 MW m(-2) K-1. We also measure the interface conductance between Pt and YIG at temperatures between 80 and 350 K. At room temperature, the interface conductance of Pt/YIG is 170 MW m(-2) K-1 and the Kapitza length is similar to 40 nm. A Kapitza length of 40 nm means that, in the presence of a steady-state heat current, the temperature drop at the Pt/YIG interface is equal to the temperature drop across a 40-nm-thick layer of YIG. At 80 K, the interface conductance of Pt/YIG is 60 MW m(-2) K-1, corresponding to a Kapitza length of similar to 300 nm.