Parametric excitation of spin waves by phonon pumping

摘要

Parametric excitation of spin waves by a traveling phonon pump is possible because of the magnetoelastic interaction. Expressions for the threshold phonon intensity required for spin‐wave pair excitation are presented. The functional dependence of the threshold intensity on pump frequency, internal field, and other pertinent parameters has been obtained numerically for several cases and the results are given here in graphical form. Experiments demonstrating spin‐wave excitation by transversely polarized phonons are reported.