The Rayleigh mode and up to six higher-order localized acoustic (Sezawa) surface modes have been observed in Fe-Pd multilayer structures using Brillouin scattering. The effective elastic constants of the multilayer structures have been determined from a fit of the measured mode dispersions. With decreasing multilayer modulation wavelength from 87 to 33 {}, the elastic constant c₁₁ shows an interface-induced softening of up to 20%.
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Baumgart et al. (1986) studied this question.
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