Determination of anisotropic elastic constants of superlattice thin films by resonant-ultrasound spectroscopy

Nakamura, Nobutomo; Ogi, Hirotsugu; Hirao, Masahiko et al.

Journal of Applied Physics, 2005, 97(1), 013532-1-013532-6

Number of Access:322（2025-08-23 04:07 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/84223

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Title
Determination of anisotropic elastic constants of superlattice thin films by resonant-ultrasound spectroscopy
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
NRID
1000090252626 1000090252626
researchmap permalink
read0042771 read0042771
Scopus Author ID
35563683500 35563683500
CreatorName
Ogi, Hirotsugu
NRID
1000080112027 1000080112027
CreatorName
Hirao, Masahiko
NRID
1000090296749 1000090296749
CreatorName
Ono, Teruo
Description
Nakamura N., Ogi H., Hirao M., et al. "Determination of anisotropic elastic constants of superlattice thin films by resonant-ultrasound spectroscopy", Journal of Applied Physics, 97(1), 013532 (2005) https://doi.org/10.1063/1.1828221.
Abstract
Superlattice thin films are expected to show elastic anisotropy because of lattice misfits at interfaces among different elements. This study demonstrates that resonant-ultrasound spectroscopy and laser-Doppler interferometry can determine anisotropic elastic constants of superlattice thin films. Mechanical resonance frequencies of a layered specimen composed of a substrate and deposited thin film depend on the elastic constants, mass densities, and dimensions of the substrate and thin film. X-ray diffraction measurement determines accurately the total thiskness of a multilayer thin film. Therefore, the elastic constants of the multilayer thin film can be derived from measured resonance frequencies, provided that mode identification on observed resonance frequencies is achieved. We measure the resonance frequencies by a piezoelectric tripod and identify the vibration modes by measuring the displacement distributions on the specimen surface using laser-Doppler interferometry. We apply the present method to a Co/Pt multilayer [Co (4 Å) Pt (16 Å)] 500 showing the perpendicular magnetic anisotropy. The in-plane elastic constants are larger than those of bulks by 1%-7%. This is attributed to internal strain due to lattice misfit at the Co-Pt interfaces through interatomic anharmonicity. © 2005 American Institute of Physics.
Publisher
American Institute of Physics
Source Title
Journal of Applied Physics
Volume (Issue)
97(1)
Page
013532-1-013532-6
Date of Issued
2005-01-01
Language
English
Handle URL
https://hdl.handle.net/11094/84223
PISSN
00218979
eISSN
10897550
NCID
AA00693547
AA11868165
Relation.isIdenticalTo
DOI (Publisher Version)
https://doi.org/10.1063/1.1828221
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, 97(1), 013532 (2005) and may be found at https://doi.org/10.1063/1.1828221.
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学術雑誌論文 Journal Article