Wave front reversal of a dipolar spin wave pulse in a nonstationary three-wave parametric interaction

The effects of wave front reversal and inversion of the rime profile are ob served experimentally For a dipolar spin wave pulse (carrier frequency omeg a(1)) interacting in a yttrium-iron garnet film with a weakly localized non stationary parametric pumping (carrier frequency omega(p) congruent to 2 om ega(1)) in a three-wave process with conservation law omega(p) = omega(1) omega(2), where omega(2) is the carrier frequency of the reversed pulse. T heoretical analysis based on the solution of the system of equations for en velopes of interacting wave packets by means of a Green's function formalis m gives a quantitative description of the observed phenomena.