Giant resonant nonlinear damping in nanoscale ferromagnets

Abstract

Magnetic damping is a key metric for emerging technologies based on magnetic nanoparticles, such as spin torque memory and high-resolution biomagnetic imaging. Despite its importance, understanding of magnetic dissipation in nanoscale ferromagnets remains elusive, and the damping is often treated as a phenomenological constant. Here we report the discovery of a giant frequency-dependent nonlinear damping that strongly alters the response of a nanoscale ferromagnet to spin torque and microwave magnetic field. This novel damping mechanism originates from three-magnon scattering that is strongly enhanced by geometric confinement of magnons in the nanomagnet. We show that the giant nonlinear damping can invert the effect of spin torque on a nanomagnet leading to a surprising current-induced enhancement of damping by an antidamping torque. Our work advances understanding of magnetic dynamics in nanoscale ferromagnets and spin torque devices.

Main text and supplemental material

References in corpus (21)

• Spin torque switching with the giant spin Hall effect of tantalum
• Microwave Oscillations of a Nanomagnet Driven by a Spin-Polarized Current
• Quantifying spin Hall angles from spin pumping: Experiments and Theory
• Bias-driven large power microwave emission from MgO-based tunnel magnetoresistance devices
• Spin-transfer-driven ferromagnetic resonance of individual nanomagnets
• Voltage-Induced Ferromagnetic Resonance in Magnetic Tunnel Junctions
• Electrical Detection of Magnetization Dynamics via Spin Rectification Effects
• Giant spin-torque diode sensitivity at low input power in the absence of bias magnetic field
• Spin Transfer Dynamics in Spin Valves with Out-of-plane Magnetized CoNi Free Layers
• Mode- and size-dependent Landau-Lifshitz damping in magnetic nanostructures: Evidence for non-local damping
• Stable Magnetic Droplet Solitons in Spin Transfer Nanocontacts
• Spin-Torque Ferromagnetic Resonance Measurements of Damping in Nanomagnets
• Wavenumber-dependent Gilbert damping in metallic ferromagnets
• Resonant Nonlinear Damping of Quantized Spin Waves in Ferromagnetic Nanowires
• Non-linear spin-wave excitation at low bias fields
• Microscopic Theory of Dipole-Exchange Spin Waves in Ferromagnetic Films: Linear and Nonlinear Processes
• Time-Domain Studies of Very-Large-Angle Magnetization Dynamics Excited by Spin Transfer Torques
• Spin torque ferromagnetic resonance with magnetic field modulation
• Direct current control of three magnon scattering processes in spin-valve nanocontacts
• Spin-transfer torque based damping control of parametrically excited spin waves in a magnetic insulator
• Non-linear radial spinwave modes in thin magnetic disks

Cited by in corpus (21)

• Controlled nonlinear magnetic damping in spin-Hall nano-devices
• Nonlocal detection of interlayer three-magnon coupling
• Nonlinear magnon polaritons
• Theory of three-magnon interaction in a vortex-state magnetic nanodot
• Controlling the nonlinear relaxation of quantized propagating magnons in nanodevices
• Theory of inertial spin dynamics in anisotropic ferromagnets
• Impulsive Fermi magnon-phonon resonance in antiferromagnetic $Co{F}_2$
• First and second order magnetic anisotropy and damping of europium iron garnet under high strain
• Interplay between nonlinear spectral shift and nonlinear damping of spin waves in ultrathin YIG waveguides
• Dimensional crossover in spin Hall oscillators
• Self-stabilizing exchange-mediated spin transport
• Easy-plane spin Hall oscillator
• Oscillations and confluence in three-magnon scattering of ferromagnetic resonance
• Origin of Nonlinear Damping due to Mode Coupling in Auto-Oscillatory Modes Strongly Driven by Spin-Orbit Torque
• Controlling selection rules for magnon scattering in nanomagnets by spatial symmetry breaking
• Apparent nonlinear damping triggered by quantum fluctuations
• Non-local magnon transconductance in extended magnetic insulating films.\\ Part I: spin diode effect
• Parametric resonance of spin waves in ferromagnetic nanowires tuned by spin Hall torque
• Spin orbit torque nano-oscillators by dipole field-localized spin wave modes
• Magnon-magnon interaction induced by nonlinear spin wave dynamics
• Superfluid-like spin transport in the dynamic states of easy-axis magnets