  The interaction between phonons and magnons is a widely developing topic,
especially in the field of acoustic spintronics. To discuss this interaction,
it is necessary to observe two different waves (acoustic and spin waves) with
the same frequency and wavelength. In the Ni80Fe20/Au/Co/Au system deposited on
a silicon substrate, we observe the interaction between spin waves and surface
acoustic waves using Brillouin light scattering spectroscopy. As a result, we
can selectively control (activate or deactivate) the magnetoelastic interaction
between the fundamental spin wave mode and surface acoustic waves by adjusting
the magnetostrictive layer thickness in the multilayer. We demonstrate that by
adjusting the number of layers in a multilayer structure, we can precisely
control the dispersion of surface acoustic waves, with minimal impact on the
fundamental spin wave mode
