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논문 기본 정보

자료유형
학술저널
저자정보
Tae-Sung Park (Seoul National University of Science and Technology) Yu-Min Choi (Seoul National University of Science and Technology) Byeong-Seok Cho (Seoul National University of Science and Technology) Ik-Keun Park (Seoul National University of Science and Technology)
저널정보
한국비파괴검사학회 비파괴검사학회지 비파괴검사학회지 제38권 제2호
발행연도
2018.4
수록면
98 - 106 (9page)
DOI
10.7779/JKSNT.2018.38.2.98

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초록· 키워드

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The present study aims to theoretically analyze the dispersion characteristics of Rayleigh waves and verify the results through experiments. Raleigh waves are generated by scanning acoustic microscope, which are used to evaluate the thickness of thin films and the material characteristics of the samples. The transfer matrix method was used in the theoretical analysis of Rayleigh wave dispersion in thin films with slow-on-fast and fast-on-slow structures. To verify the dispersion diagram derived from the analysis, the e-beam evaporation and plasma-enhanced chemical vapor deposition technique was applied to fabricate slow-on-fast and fast-on-slow thin films of varying thicknesses. Slow-on-fast structures were created by depositing nickel (Ni) films on silicon (Si) substrates; fast-on-slow structures were produced by depositing silicon nitride (Si₃N₄) on gallium arsenide (GaAs) substrates. The scanning acoustic microscope used V(z) curves to precisely measure the velocity of the Rayleigh waves. This was to evaluate their dispersion depending on the thickness of each film. A comparison of the measured velocities against the theoretical dispersion diagram resulted in an error rate of less than 6% in the slow-on-fast structure and less than 10% in the fast-on-slow structure. In conclusion, this study confirmed that the theoretically derived dispersion characteristics correspond well with those observed in actual thin films, thereby suggesting the potential use of theoretical dispersion diagrams in evaluating the thickness and material characteristics of thin films.

목차

Abstract
1. Introduction
2. Theory
3. Specimen fabrication and experimental method
4. Results and Discussion
5. Conclusions
References

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