Effect of magnon decays on parametrically pumped magnons
arXiv:2012.07870 · doi:10.1103/PhysRevB.103.094416
Abstract
We investigate the influence of magnon decays on the non-equilibrium dynamics of parametrically excited magnons in the magnetic insulator yttrium-iron garnet (YIG). Our investigations are motivated by a recent experiment by Noack et al. [Phys. Status Solidi B 256, 1900121 (2019)] where an enhancement of the spin pumping effect in YIG was observed near the magnetic field strength where magnon decays via confluence of magnons becomes kinematically possible. To explain the experimental findings, we have derived and solved kinetic equations for the non-equilibrium magnon distribution. The effect of magnon decays is taken into account microscopically via collision integrals derived from interaction vertices involving three powers of magnon operators. Our results agree quantitatively with the experimental data.
arXiv comment23 pages, 18 figures
References in corpus (16)
- Spin Hall effect
- Magnon spin transport driven by the magnon chemical potential in a magnetic insulator
- Thermal spin dynamics of yttrium iron garnet
- Landau-Lifshitz theory of the longitudinal spin Seebeck effect
- Magneto-elastic modes and lifetime of magnons in thin yttrium-iron garnet films
- Transport equations including many-particle correlations for an arbitrary quantum system. General formalism
- Theory of coherence in Bose-Einstein condensation phenomena in a microwave driven interacting magnon gas
- Stability of Bose Einstein condensates of hot magnons in YIG
- Microscopic spin-wave theory for yttrium-iron garnet films
- Microscopic Theory of Dipole-Exchange Spin Waves in Ferromagnetic Films: Linear and Nonlinear Processes
- Dynamic phase diagram of dc-pumped magnon condensates
- Rayleigh-Jeans condensation of pumped magnons in thin film ferromagnets
- Bose-Einstein condensation at finite momentum and magnon condensation in thin film ferromagnets
- Parametric pumping and kinetics of magnons in dipolar ferromagnets
- Field-dependence of magnon decay in yttrium iron garnet thin films
- Collisionless kinetic theory for parametrically pumped magnons
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- Accumulation of magnetoelastic bosons in yttrium iron garnet: kinetic theory and wave vector resolved Brillouin light scattering
- Spin-transfer-assisted parametric pumping of magnons in yttrium iron garnet