Using Amorphous CoB Alloy as Transducer to Detect Acoustic Propagation and Heat Transport at Interface
Acoustic oscillation provides useful information regarding the interfacial coupling between metal transducer layers and substrate materials. The interfacial coupling can be significantly reduced by a mechanically soft layer between the transducer and substrate. However, preserving a thin, soft layer...
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2021-06-01
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Online Access: | https://www.mdpi.com/2076-3417/11/11/5155 |
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doaj-9529f7d10e4d4d97b9c9cddd8ff4fd3d2021-06-30T23:04:15ZengMDPI AGApplied Sciences2076-34172021-06-01115155515510.3390/app11115155Using Amorphous CoB Alloy as Transducer to Detect Acoustic Propagation and Heat Transport at InterfaceLiu Jian0Gyung-Min Choi1Department of Energy Science, Sungkyunkwan University, Suwon 16419, KoreaDepartment of Energy Science, Sungkyunkwan University, Suwon 16419, KoreaAcoustic oscillation provides useful information regarding the interfacial coupling between metal transducer layers and substrate materials. The interfacial coupling can be significantly reduced by a mechanically soft layer between the transducer and substrate. However, preserving a thin, soft layer at the interface during fabrication is often challenging. In this study, we demonstrate that an amorphous CoB alloy on top of a sapphire substrate can substantially amplify acoustic oscillations. By analyzing the attenuation of acoustic oscillations, we show that a thin, soft layer with a thickness of >2 ± 1 Å exists at the interface. The intermediate layer at the interface is further verified by investigating heat transport. By analyzing the slow decrease of the temperature of the transducer layer, we determine a thermal conductance of 35 ± 5 MW m<sup>−2</sup> K<sup>−1</sup> at the transducer/substrate interface. This low value supports the existence of a thin, soft layer at the interface. Our results demonstrate that an amorphous metal with B alloying effectively preserves the soft nature at the interface and detects the acoustic propagation and heat transport across it.https://www.mdpi.com/2076-3417/11/11/5155acoustic wavepicosecond acousticsinterfacial layerthermal conductance |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Liu Jian Gyung-Min Choi |
spellingShingle |
Liu Jian Gyung-Min Choi Using Amorphous CoB Alloy as Transducer to Detect Acoustic Propagation and Heat Transport at Interface Applied Sciences acoustic wave picosecond acoustics interfacial layer thermal conductance |
author_facet |
Liu Jian Gyung-Min Choi |
author_sort |
Liu Jian |
title |
Using Amorphous CoB Alloy as Transducer to Detect Acoustic Propagation and Heat Transport at Interface |
title_short |
Using Amorphous CoB Alloy as Transducer to Detect Acoustic Propagation and Heat Transport at Interface |
title_full |
Using Amorphous CoB Alloy as Transducer to Detect Acoustic Propagation and Heat Transport at Interface |
title_fullStr |
Using Amorphous CoB Alloy as Transducer to Detect Acoustic Propagation and Heat Transport at Interface |
title_full_unstemmed |
Using Amorphous CoB Alloy as Transducer to Detect Acoustic Propagation and Heat Transport at Interface |
title_sort |
using amorphous cob alloy as transducer to detect acoustic propagation and heat transport at interface |
publisher |
MDPI AG |
series |
Applied Sciences |
issn |
2076-3417 |
publishDate |
2021-06-01 |
description |
Acoustic oscillation provides useful information regarding the interfacial coupling between metal transducer layers and substrate materials. The interfacial coupling can be significantly reduced by a mechanically soft layer between the transducer and substrate. However, preserving a thin, soft layer at the interface during fabrication is often challenging. In this study, we demonstrate that an amorphous CoB alloy on top of a sapphire substrate can substantially amplify acoustic oscillations. By analyzing the attenuation of acoustic oscillations, we show that a thin, soft layer with a thickness of >2 ± 1 Å exists at the interface. The intermediate layer at the interface is further verified by investigating heat transport. By analyzing the slow decrease of the temperature of the transducer layer, we determine a thermal conductance of 35 ± 5 MW m<sup>−2</sup> K<sup>−1</sup> at the transducer/substrate interface. This low value supports the existence of a thin, soft layer at the interface. Our results demonstrate that an amorphous metal with B alloying effectively preserves the soft nature at the interface and detects the acoustic propagation and heat transport across it. |
topic |
acoustic wave picosecond acoustics interfacial layer thermal conductance |
url |
https://www.mdpi.com/2076-3417/11/11/5155 |
work_keys_str_mv |
AT liujian usingamorphouscoballoyastransducertodetectacousticpropagationandheattransportatinterface AT gyungminchoi usingamorphouscoballoyastransducertodetectacousticpropagationandheattransportatinterface |
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