Variable damping and coherence in a high-density magnon gas

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 which is in disagreement with both the standard model of exponential decay and with earlier observations of non-linear 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.

References in corpus (3)

• Spin Seebeck insulator
• Parametrically-stimulated recovery of a microwave signal using standing spin-wave modes of a magnetic film
• Microwave spectral analysis by means of non-resonant parametric recovery of spin-wave signals in a thin magnetic film

Cited by in corpus (5)

• Parallel pumping for magnon spintronics: Amplification and manipulation of magnon spin currents on the micron-scale
• Coherent excitation of heterosymmetric spin waves with ultrashort wavelengths
• Storage-recovery phenomenon in magnonic crystal
• Brillouin light scattering spectroscopy of parametrically excited dipole-exchange magnons
• Macroscopic Zeno effect and stationary flows in nonlinear waveguides with localized dissipation