Title :
Electron-phonon SAW attenuation in aluminum for all ql
Author :
Schneider, Susan C.
Author_Institution :
Dept. of Electr. Comput. & Biomed. Eng., Marquette Univ., Milwaukee, WI, USA
Abstract :
Theoretical expressions for the electron-phonon contribution to the attenuation of surface acoustic waves (SAW) propagating on a semi-infinite block of material have been obtained for all ql, where q is the sound propagation vector and l is the electron mean-free path. The calculation of the attenuation due to electron-phonon interaction for ql<<1 is straightforward; however, extension of this calculation to all ql values requires knowledge of the ql dependence of the viscous damping coefficients, chi and eta . Approximations for chi and eta for all ql are obtained by analogy with attenuation expressions derived for longitudinal transverse bulk sound waves. Curves for chi , eta , and the electron-phonon contribution to the attenuation of SAW propagating on a semi-infinite block of aluminum are presented.<>
Keywords :
acoustic wave propagation; aluminium; electron-phonon interactions; surface acoustic waves; Al; SAW attenuation; electron mean-free path; electron-phonon; longitudinal transverse bulk sound waves; sound propagation vector; surface acoustic waves; viscous damping; Acoustic materials; Acoustic propagation; Acoustic waves; Aluminum; Attenuation; Charge carrier processes; Damping; Electrons; Surface acoustic waves; Time of arrival estimation;
Journal_Title :
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on
