Abstract
We report on the fast relaxation behavior of a high-density magnon gas created by a parametric amplification process. The magnon gas is probed using the technique of spin-wave packet recovery by parallel parametric pumping. Experimental results show a damping behavior that is in disagreement with both the standard model of exponential decay and with earlier observations of nonlinear damping. In particular, the inherent magnon damping is found to depend upon the presence of the parametric pumping field. A phenomenological model, which accounts for the dephasing of the earlier injected magnons, is in good agreement with the experimental data.
- Received 23 March 2011
DOI:https://doi.org/10.1103/PhysRevB.83.184407
©2011 American Physical Society