Strong strain-dependent elastic stiffness in ultrathin Pt films on MgO

Nakamura, N.; Kake, Y.; Ogi, H. et al.

Journal of Applied Physics, 2010, 108(4), 043525-1-043525-4

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Identifier to cite or link to this item: https://hdl.handle.net/11094/84229

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Title
Strong strain-dependent elastic stiffness in ultrathin Pt films on MgO
Creator
NRID
1000050452404 1000050452404
researchmap permalink
nnakamura nnakamura
Scopus Author ID
7403356186 7403356186
ORCID
0000-0002-5338-842X 0000-0002-5338-842X
CreatorName
Nakamura, N.
CreatorName
Kake, Y.
NRID
1000090252626 1000090252626
researchmap permalink
read0042771 read0042771
Scopus Author ID
35563683500 35563683500
ORCID
0000-0002-9602-5194 0000-0002-9602-5194
CreatorName
Ogi, H.
NRID
1000080112027 1000080112027
CreatorName
Hirao, M.
Description
Nakamura N., Kake Y., Ogi H., et al. "Strong strain-dependent elastic stiffness in ultrathin Pt films on MgO", Journal of Applied Physics, 108(4), 043525 (2010) https://doi.org/10.1063/1.3460799.
Abstract
In this study, strong strain dependence of the elastic stiffness is found in polycrystalline Pt films. Epitaxial and polycrystalline Pt films thinner than 100 nm were deposited on monocrystal MgO substrates and resonance frequency of longitudinal standing wave in the film thickness direction was measured by picosecond ultrasound. In epitaxial Pt film, the resonance frequency was comparable to or smaller than the value expected from the elastic stiffness of bulk Pt, indicating softening of epitaxial Pt films, where nanoscale defects were observed: the softening was attributed to the defects. However, in polycrystalline Pt films, resonance frequency increased as the film thickness decreased and when the film thickness was smaller than 20 nm, the value exceeded the predicted value from the bulk stiffness, indicating the stiffening of the Pt film. Furthermore, resonance frequency showed good correlation with the strain. This trend is expected considering the higher elasticity. However, the slope between the resonance frequency and the strain is ten times as large as the value deduced from third-order elastic constant. © 2010 American Institute of Physics.
Publisher
American Institute of Physics
Source Title
Journal of Applied Physics
Volume (Issue)
108(4)
Page
043525-1-043525-4
Date of Issued
2010-08-15
Language
English
Handle URL
https://hdl.handle.net/11094/84229
PISSN
00218979
eISSN
10897550
NCID
AA00693547
AA11868165
Relation.isIdenticalTo
DOI (Publisher Version)
https://doi.org/10.1063/1.3460799
Access Rights
open access
CopyRight
This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Journal of Applied Physics, 108(4), 043525 (2010) and may be found at https://doi.org/10.1063/1.3460799.
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Category
学術雑誌論文 Journal Article