Journal of Low Temperature Physics

, Volume 57, Issue 5–6, pp 501–527 | Cite as

The attenuation and phase velocity of ultrasonic third sound for optically smooth and roughened substrates

  • Edward R. Generazio
  • Robert W. Reed


The attenuation and phase velocity of third sound have been measured for propagation on optically smooth and roughened substrates and for ultrasonic frequencies in the 20–200 kHz range. The attenuation for both kinds of substrates is found to be proportional to the frequency and have a magnitude that increases with the amount of roughening. The data are found to be inconsistent with a number of proposed attenuation mechanisms. The phase velocity is nearly independent of the frequency. Pulse wave shapes change substantially as the third sound propagates along a substrate surface.


Attenuation Magnetic Material Phase Velocity Substrate Surface Pulse Wave 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Plenum Publishing Corporation 1984

Authors and Affiliations

  • Edward R. Generazio
    • 1
  • Robert W. Reed
    • 1
  1. 1.Department of Physics and Applied Research LaboratoryPennsylvania State UniversityUniversity Park

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