Origin of Nonlinear Damping due to Mode Coupling in Auto-Oscillatory Modes Strongly Driven by Spin-Orbit Torque
arXiv:2107.00150 · doi:10.1103/PhysRevApplied.17.064047
Abstract
We investigate the physical origin of nonlinear damping due to mode coupling between several auto-oscillatory modes driven by spin-orbit torque in constricted Py/Pt heterostructures by examining the dependence of auto-oscillation on temperature and applied field orientation. We observe a transition in the nonlinear damping of the auto-oscillation modes extracted from the total oscillation power as a function of drive current, which coincides with the onset of power redistribution amongst several modes and the crossover from linewidth narrowing to linewidth broadening in all individual modes. This indicates the activation of another relaxation process by nonlinear magnon-magnon scattering within the modes. We also find that both nonlinear damping and threshold current in the mode-interaction damping regime at high drive current after transition are temperature independent, suggesting that the mode coupling occurs dominantly through a non-thermal magnon scattering process via a dipole or exchange interaction rather than thermally excited magnon-mediated scattering. This finding presents a promising pathway to overcome the current limitations of efficiently controlling the interaction between two highly nonlinear magnetic oscillators to prevent mode crosstalk or inter-mode energy transfer and deepens understanding of complex nonlinear spin dynamics in multimode spin wave systems.
arXiv comment13 pages, 15 figures
References in corpus (21)
- The design and verification of Mumax3
- Spin Torque Ferromagnetic Resonance Induced by the Spin Hall Effect
- Generation of coherent spin-wave modes in Yttrium Iron Garnet microdiscs by spin-orbit torque
- Determination of intrinsic spin Hall angle in Pt
- Nanowire Spin Torque Oscillator Driven by Spin Orbit Torques
- Spectral Characteristics of the Microwave Emission by the Spin Hall Nano-Oscillator
- Experimental Investigation of Temperature-Dependent Gilbert Damping in Permalloy Thin Films
- Experimental evidence of self-localized and propagating spin wave modes in obliquely magnetized current-driven nanocontacts
- Thickness and power dependence of the spin-pumping effect in Y3Fe5O12/Pt heterostructures measured by the inverse spin Hall effect
- Planar Hall torque
- Spin-Orbit-Torque Driven Propagating Spin Waves
- An Intrinsic Spin Orbit Torque Nano-Oscillator
- Mechanisms limiting the coherence time of spontaneous magnetic oscillations driven by DC spin-polarized currents
- On the origin of magnetization auto-oscillations in constriction-based spin Hall nano-oscillators
- Decoherence and mode-hopping in a magnetic tunnel junction-based spin-torque oscillator
- Power and linewidth of propagating and localized modes in nanocontact spin-torque oscillators
- Giant resonant nonlinear damping in nanoscale ferromagnets
- Mapping out the spin-wave modes of constriction-based spin Hall nano-oscillators in weak in-plane fields
- Generation linewidth of mode-hopping spin torque oscillators
- Temperature dependence of linewidth in nano-contact based spin torque oscillators: effect of multiple oscillatory modes
- Tunable mode coupling in nano-contact spin torque oscillators