Fig. 3: Dispersion relations of the acoustic spin waves in an infinitely extended SAF film at a field of μ0Hx = 50 mT.
a Dispersion according to the dynamical matrix formalism. The shaded areas are the regions in which the antenna cannot detect spin waves. Sketched dispersion relations at low frequency (b), at \(\vec{k}=\vec{0}\) frequency (c), slightly above (d) and much above (e). The arrows sketch the directions of the group velocities. The arrows are gray when the group velocity points downward from the antenna.
