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Article

Using Amorphous CoB Alloy as Transducer to Detect Acoustic Propagation and Heat Transport at Interface

by 1 and 1,2,*
1
Department of Energy Science, Sungkyunkwan University, Suwon 16419, Korea
2
Center for Integrated Nanostructure Physics, Institute for Basic Science (IBS), Suwon 16419, Korea
*
Author to whom correspondence should be addressed.
Academic Editor: Filippo Berto
Appl. Sci. 2021, 11(11), 5155; https://doi.org/10.3390/app11115155
Received: 27 April 2021 / Revised: 31 May 2021 / Accepted: 31 May 2021 / Published: 1 June 2021
(This article belongs to the Topic Metallurgical and Materials Engineering)
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−2 K−1 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. View Full-Text
Keywords: acoustic wave; picosecond acoustics; interfacial layer; thermal conductance acoustic wave; picosecond acoustics; interfacial layer; thermal conductance
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MDPI and ACS Style

Jian, L.; Choi, G.-M. Using Amorphous CoB Alloy as Transducer to Detect Acoustic Propagation and Heat Transport at Interface. Appl. Sci. 2021, 11, 5155. https://doi.org/10.3390/app11115155

AMA Style

Jian L, Choi G-M. Using Amorphous CoB Alloy as Transducer to Detect Acoustic Propagation and Heat Transport at Interface. Applied Sciences. 2021; 11(11):5155. https://doi.org/10.3390/app11115155

Chicago/Turabian Style

Jian, Liu, and Gyung-Min Choi. 2021. "Using Amorphous CoB Alloy as Transducer to Detect Acoustic Propagation and Heat Transport at Interface" Applied Sciences 11, no. 11: 5155. https://doi.org/10.3390/app11115155

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