An intrinsic mechanism of nonlinear ferromagnetic relaxation in thin metallic films was proposed. Using analytic theory as well as micromagnetic simulations, it was shown that the four-magnon scattering process was responsible for a rapid decay of the k=0 mode into k ≠ 0 magnons. This mechanism dominates competing linear relaxation mechanisms and governs large angle magnetization reversal in technologically important systems.
Bibliographical noteFunding Information:
This work was supported by the NSF through the MRSEC program, Grant No. NSF/DMR-9809364, and by the University of Minnesota Supercomputing Institute.