Simultaneous propagation of magnetostatic and spin-elastic waves in nonellipsoidal ferrimagnets

Spin-wave propagation parallel to the static biasing field is considered in the presence of magnetostatic boundary effects for a saturated nonellipsoidal ferrimagnet. It is shown that two principal branches exist in the delay-field characteristics, over the same biasing range, with delay decreasing monotonically with applied field. The predominantly magnetostatic branch is related to the experiments of Kedzie, the coupling mechanisms of wire antennas to spin waves, and observations on magnetostatic-mode parametric amplifiers.