Elastic stiffness of metallic multilayers studied by picosecond ultrasonics: Improved interpretation of interface elasticity

Nakamura, Nobutomo; Yokomura, Ryo; Takeuchi, Nobutaka et al.

Japanese Journal of Applied Physics, 2019, 58(7), 075504

Number of Access:492（2025-08-23 20:44 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/84483

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Title
Elastic stiffness of metallic multilayers studied by picosecond ultrasonics: Improved interpretation of interface elasticity
Creator
NRID
1000050452404 1000050452404
researchmap permalink
nnakamura nnakamura
Scopus Author ID
7403356186 7403356186
ORCID
0000-0002-5338-842X 0000-0002-5338-842X
CreatorName
Nakamura, Nobutomo
CreatorName
Yokomura, Ryo
CreatorName
Takeuchi, Nobutaka
CreatorName
Yamakado, Daiki
NRID
1000090252626 1000090252626
researchmap permalink
read0042771 read0042771
Scopus Author ID
35563683500 35563683500
CreatorName
Ogi, Hirotsugu
Description
This is the Accepted Manuscript version of an article accepted for publication in Japanese Journal of Applied Physics. IOP Publishing Ltd are not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at https://doi.org/10.35848/1347-4065/abea50.
Abstract
In metallic multilayers, elastic stiffness is often reported to decrease with an increasing number of interfaces. This phenomenon is generally attributed to softening at interfaces, and a decrease of 50% or more in interface stiffness is expected. This interpretation of the elastic stiffness of metallic multilayers is commonly accepted; however, we propose that the decrease of interface stiffness is doubtful because it is difficult to explain the large decrease using existing models. In the present study, to confirm the validity of the decrease of interface stiffness, the longitudinal-wave elastic stiffness in the stacking direction is measured using picosecond ultrasonics. The elastic stiffness of Cr/Fe, Cu/Co, and Nb/Cu multilayers with several thickness ratios is measured, and the decrease in multilayer stiffness is experimentally demonstrated to arise from the decrease in stiffness of each layer, not from a decrease in interface stiffness.
Publisher
The Japan Society of Applied Physics
Source Title
Japanese Journal of Applied Physics
Volume (Issue)
58(7)
Page
075504
Date of Issued
2019-06-24
Language
English
Handle URL
https://hdl.handle.net/11094/84483
PISSN
00214922
eISSN
13474065
NCID
AA12295836
Relation.isVersionOf
DOI (Publisher Version)
https://doi.org/10.7567/1347-4065/ab242b
Access Rights
open access
CopyRight
© 2019 The Japan Society of Applied Physics. This Accepted Manuscript is available for reuse under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License after the 12 month embargo period provided that all the terms of the license are adhered to.
oaire:version
Accepted Manuscript
Category
学術雑誌論文 Journal Article