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Thin-film characterization using a scanning laser acoustic microscope with surface acoustic waves

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3 Author(s)
Robbins, W.P. ; Dept. of Electr. Eng., Minnesota Univ., Minneapolis, MN, USA ; Mueller, R.K. ; Rudd, E.

The use of surface acoustic waves in a scanning laser acoustic microscope for the characterization of the mechanical or acoustic properties of thin films deposited on piezoelectric substrates is demonstrated. Quantitative measurements of mass loading effects of 5000-AA-thick tungsten films deposited on lithium niobate substrates were obtained using 100-MHz surface acoustic waves. No information about the tungsten film could be obtained using 100-MHz compressional waves. Methods of generating surface waves on nonpiezoelectric materials so that this technique could be used on arbitrary substrates are discussed.<>

Published in:

Ultrasonics, Ferroelectrics and Frequency Control, IEEE Transactions on  (Volume:35 ,  Issue: 4 )

Date of Publication:

July 1988

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