Applicability of the Group Velocity Concept in Describing a Surface Spin Wave

Resumo

The conditions under which a useful signal modulating a surface spin wave is not distorted and its propagation in a ferrite film can be characterized using the group velocity concept is studied. It is shown that the greater the ratio of the first and second derivatives of the dispersion dependence for the spin wave, the greater the distance this signal can pass without distortion. It is found that for a surface spin wave, the best conditions for the transmission of the useful signal are observed for a small region of wave numbers in the initial part of the wave spectrum, where this distance can be as great as several millimeters.