Controlling the nonlinear relaxation of quantized propagating magnons in nanodevices

Abstract

Relaxation of linear magnetization dynamics is well described by the viscous Gilbert damping processes. However, for strong excitations, nonlinear damping processes such as the decay via magnon-magnon interactions emerge and trigger additional relaxation channels. Here, we use space- and time-resolved microfocused Brillouin light scattering spectroscopy and micromagnetic simulations to investigate the nonlinear relaxation of strongly driven propagating spin waves in yttrium iron garnet nanoconduits. We show that the nonlinear magnon relaxation in this highly quantized system possesses intermodal features, i.e., magnons scatter to higher-order quantized modes through a cascade of scattering events. We further show how to control such intermodal dissipation processes by quantization of the magnon band in single-mode devices, where this phenomenon approaches its fundamental limit. Our study extends the knowledge about nonlinear propagating spin waves in nanostructures which is essential for the construction of advanced spin-wave elements as well as the realization of Bose-Einstein condensates in scaled systems.

arXiv comment8 pages, 4 figures

References in corpus (16)

• The design and verification of Mumax3
• Generation linewidth of an auto-oscillator with a nonlinear frequency shift: Spin-torque nano-oscillator
• Spin pinning and spin-wave dispersion in nanoscopic ferromagnetic waveguides
• Low damping and microstructural perfection of sub-40nm-thin yttrium iron garnet films grown by liquid phase epitaxy
• Propagation of spin-waves packets in individual nano-sized yttrium iron garnet magnonic conduits
• Resources of nonlinear cavity magnonics for quantum information
• Bose-Einstein Condensation of Quasi-Particles by Rapid Cooling
• Brillouin light scattering spectroscopy of parametrically excited dipole-exchange magnons
• Resonant Nonlinear Damping of Quantized Spin Waves in Ferromagnetic Nanowires
• Non-linear spin-wave excitation at low bias fields
• Giant resonant nonlinear damping in nanoscale ferromagnets
• Nutation spectroscopy of a nanomagnet driven into deeply nonlinear ferromagnetic resonance
• Spontaneous Exact Spin-Wave Fractals in Magnonic Crystals
• Non-uniform spin wave softening in 2D magnonic crystals as a tool for opening omnidirectional magnonic band gaps
• Parametrically squeezed states of microwave magnons in yttrium iron garnet films
• Bose-Einstein Condensation of Nonequilibrium Magnons in Confined Systems

Cited by in corpus (6)

• Roadmap on Spin-Wave Computing
• Nonlocal detection of interlayer three-magnon coupling
• Interplay between nonlinear spectral shift and nonlinear damping of spin waves in ultrathin YIG waveguides
• Quantitative imaging of nonlinear spin-wave propagation using diamond quantum sensors
• Nonlinear suppression of dispersion broadening of ultrashort spin-wave pulses in thin YIG films
• Stimulated Magnonic Frequency Combs