Sound velocity and internal friction in vacuum-deposited gold films

Uozumi, Kiyohiko; Nakada, Taro; Kinbara, Akira

doi:10.1016/0040-6090(72)90395-1

Cited by 11 publications

(2 citation statements)

References 2 publications

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“…Some discrepancies can exist because of various factors such as the annealing temperature or the coating method (thin films exhibiting mechanical properties different from those of bulk materials). Results reported in this paper (on the order of φ Cr ≈ 16 × 10 −4 and φ Au ≈ 4 × 10 −4 ) though slightly frequency dependent are still consistent with the partially existing previous data [47,48]. It should be mentioned that quality factors of metallized resonators used in frequency standards, i.e.…”

Section: Discussionsupporting

confidence: 91%

A new method of probing mechanical losses of coatings at cryogenic temperatures

Galliou

Deléglise

Goryachev

et al. 2016

Review of Scientific Instruments

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A new method of probing mechanical losses and comparing the corresponding deposition processes of metallic and dielectric coatings in 1-100 MHz frequency range and cryogenic temperatures is presented. The method is based on the use of extremely high-quality quartz acoustic cavities whose internal losses are orders of magnitude lower than any available coatings nowadays. The approach is demonstrated for Chromium, Chromium/Gold and a multilayer tantala/silica coatings. The Ta2O5/SiO2 coating has been found to exhibit a loss angle lower than 1.6 × 10 −5 near 30 MHz at 4 K. The results are compared to the previous measurements.

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Section: Discussionsupporting

confidence: 91%

A new method of probing mechanical losses of coatings at cryogenic temperatures

Galliou

Deléglise

Goryachev

et al. 2016

Review of Scientific Instruments

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“…The thickness-dependent longitudinal sound velocity in the nickel film can thus be estimated as shown in Table , according to the precise Ni thickness measurement in STEM measurement. The hypersound wave propagated much slower in the 2 nm thick layer due to the thin-film softening effect, which has also been found in Au films, , while the velocity is closer to the bulk value in the 10 nm thick Ni layer. Recently, with the same sample preparation procedure, a similar softening result was observed in a 4.5 nm thick Au film in a photoacoustic study, in which the sound velocity also dropped from the bulk 3.2 nm/ps value to 2.3 nm/ps.…”

Section: Resultssupporting

confidence: 60%

Terahertz Photoacoustic Generation Using Ultrathin Nickel Nanofilms

Chou

Shen

et al. 2021

J. Phys. Chem. C

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Picosecond ultrasonic laser sonar (PULSE), one of the noninvasive technologies with a high thickness sensitivity, is capable of probing multilayer films directly on the production wafers. To reach high spatial resolution in the current PULSE system, generation of terahertz photoacoustic pulses through an ultrathin metal film has been the focus of recent studies. In this study, we propose and demonstrate the high potential of ultrathin nickel (Ni) films for THz photoacoustic generation. After femtosecond laser excitation, the photoacoustic frequency launched by the ultrathin Ni nanofilms could be up to 1.4 THz, corresponding to a record-breaking spatial resolution in the single metallic layer system. We discuss the detailed thickness-dependent mechanism with the two-temperature model, which indicates that the ultrahigh-frequency acoustic signals were generated due to the significant contribution of hot electron pressure in Ni, very different from the case for gold. By looking into the ultrafast hot electron relaxation mechanism, our results provide a guideline to further break the technical limit of the metallic terahertz photoacoustic frequency generation in the near future.

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Mechanical Properties of Non-Metallic Thin Films

Hoffman

1976

Physics of Nonmetallic Thin Films

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Sound velocity and internal friction in vacuum-deposited gold films

Cited by 11 publications

References 2 publications

A new method of probing mechanical losses of coatings at cryogenic temperatures

A new method of probing mechanical losses of coatings at cryogenic temperatures

Terahertz Photoacoustic Generation Using Ultrathin Nickel Nanofilms

Mechanical Properties of Non-Metallic Thin Films

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