Extraction of interface stiffness in superlattices : Proposal of the interface elasticity parameter

Ogi, Hirotsugu; Shagawa, Tomohiro; Nakamura, Nobutomo et al.

Applied Physics Express, 2009, 2(10), 105001

Number of Access:492（2025-11-25 02:20 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/84153

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Title
Extraction of interface stiffness in superlattices : Proposal of the interface elasticity parameter
Creator
NRID
1000090252626 1000090252626
researchmap permalink
read0042771 read0042771
Scopus Author ID
35563683500 35563683500
ORCID
0000-0002-9602-5194 0000-0002-9602-5194
CreatorName
Ogi, Hirotsugu
CreatorName
Shagawa, Tomohiro
NRID
1000050452404 1000050452404
researchmap permalink
nnakamura nnakamura
Scopus Author ID
7403356186 7403356186
ORCID
0000-0002-5338-842X 0000-0002-5338-842X
CreatorName
Nakamura, Nobutomo
NRID
1000080112027 1000080112027
CreatorName
Hirao, Masahiko
Description
Hirotsugu Ogi, Tomohiro Shagawa, Nobutomo Nakamura and Masahiko Hirao. Extraction of interface stiffness in superlattices : Proposal of the interface elasticity parameter. Applied Physics Express, 2009, 2(10), 105001. https://doi.org/10.1143/APEX.2.105001.
Abstract
We develop a methodology to extract the interface stiffness in superlattices using picosecond ultrasound spectroscopy. Ultrafast light pulses excite and detect thickness phonon modes in a five-layered superlattice thin film, consisting of three matrix layers and two ultrathin interlayers. The thickness of interlayer is varied between 2 and 10 -A. We define the interface elasticity parameter as the frequency ratio of two phonon modes, which are sensitive and insensitive to the interface elastic constants, and inversely evaluated the elastic stiffness of the interlayer. It is revealed that the interface in the superlattice thin film is significantly softened.
Publisher
The Japan Society of Applied Physics
Source Title
Applied Physics Express
Volume (Issue)
2(10)
Page
105001
Date of Issued
2009-10-09
Language
English
Handle URL
https://hdl.handle.net/11094/84153
PISSN
18820778
eISSN
18820786
NCID
AA12295133
Relation.isVersionOf
DOI (Publisher Version)
https://doi.org/10.1143/APEX.2.105001
Access Rights
open access
oaire:version
Accepted Manuscript
Category
学術雑誌論文 Journal Article