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

Nakamura, Nobutomo; Yokomura, Ryo; Takeuchi, Nobutaka; Yamakado, Daiki; Ogi, Hirotsugu

doi:https://doi.org/10.7567/1347-4065/ab242b

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

アクセス数:530件（2025-10-24 09:04 集計）

固定URL: https://hdl.handle.net/11094/84483

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タイトル	Elastic stiffness of metallic multilayers studied by picosecond ultrasonics: Improved interpretation of interface elasticity
著者	NRID 1000050452404 1000050452404 researchmap permalink nnakamura nnakamura Scopus Author ID 7403356186 7403356186 ORCID 0000-0002-5338-842X 0000-0002-5338-842X 著者名 Nakamura, Nobutomo
	著者名 Yokomura, Ryo
	著者名 Takeuchi, Nobutaka
	著者名 Yamakado, Daiki
	NRID 1000090252626 1000090252626 researchmap permalink read0042771 read0042771 Scopus Author ID 35563683500 35563683500 著者名 Ogi, Hirotsugu
内容	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.
抄録	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.
出版者	The Japan Society of Applied Physics
収録物名	Japanese Journal of Applied Physics
巻(号)	58(7)
ページ	075504
刊行年月	2019-06-24
言語	英語
ハンドルURL	https://hdl.handle.net/11094/84483
PISSN	00214922
eISSN	13474065
NCID	AA12295836
関連情報 (isVersionOf)	DOI (出版社版) https://doi.org/10.7567/1347-4065/ab242b
アクセス権	open access
権利情報	© 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.
出版タイプ	Accepted Manuscript
カテゴリ	学術雑誌論文 Journal Article

資源タイプ	学術雑誌論文
ローカル資源タイプ	学術雑誌論文
DCMI資源タイプ	text
DCTERMS.bibliographicCitation	Japanese Journal of Applied Physics. 2019, 58(7), p. 075504
DC.title	Elastic stiffness of metallic multilayers studied by picosecond ultrasonics: Improved interpretation of interface elasticity
DC.creator	Nakamura, Nobutomo
	Yokomura, Ryo
	Takeuchi, Nobutaka
	Yamakado, Daiki
	Ogi, Hirotsugu
DC.publisher	The Japan Society of Applied Physics
DC.language' scheme='DCTERMS.RFC1766	英語
DC.type' scheme='DCTERMS.DCMIType	text
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2019-06-24
DC.identifier	https://doi.org/10.7567/1347-4065/ab242b
DC.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.
DCTERMS.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.
DC.rights	© 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.
DC.format	84483
citation_title	Elastic stiffness of metallic multilayers studied by picosecond ultrasonics: Improved interpretation of interface elasticity
citation_author	Nakamura, Nobutomo
	Yokomura, Ryo
	Takeuchi, Nobutaka
	Yamakado, Daiki
	Ogi, Hirotsugu
citation_publisher	The Japan Society of Applied Physics
citation_language	英語
citation_date	2019-06-24
citation_journal_title	Japanese Journal of Applied Physics
citation_volume	58
citation_issue	7
citation_firstpage	075504
citation_doi	https://doi.org/10.7567/1347-4065/ab242b
citation_public_url	https://hdl.handle.net/11094/84483

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

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