J0402-1-5 ピコ秒レーザー超音波法を用いた薄膜の極低温における弾性定数計測法の開発([J0402-1]超音波計測・解析法の新展開(1))

概要

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In this study, we developed elastic-constant measurement in thin films at low temperatures using picosecond laser ultrasound spectroscopy. Specimens are cooled with liquid He through a heat exchanger in a cryostat, and an ultrahigh-frequency acoustic pulse is generated using a femtosecond light pulse, which propagates in the film-thickness directioa Acoustic-phonon resonances are observed by the changes in reflectivity of the time-delayed probe light and give the longitudinal-wave out-of-plane elastic constant We observed the temperature dependence of elastic constant C^<111> of a Pd thin film. This method is useful for studying the elastic properties of metallic thin films at cryogenic temperatures.
一般社団法人日本機械学会の論文
2010-09-04