Precessional spin-torque dynamics in biaxial antiferromagnets

Abstract

The Néel order of an antiferromagnet subject to a spin torque can undergo precession in a circular orbit about any chosen axis. To orient and stabilize the motion against the effects of magnetic anisotropy, the spin polarization should have components in-plane and normal to the plane of the orbit, where the latter must exceed a threshold. For biaxial antiferromagnets, the precessional motion is described by the equation for a damped-driven pendulum, which has hysteresis a function of the spin current with a critical value where the period diverges. The fundamental frequency of the motion varies inversely with the damping, and as $(x^p-1{)}^{1/p}$ with the drive-to-criticality ratio $x$ and the parameter $p>2$. An approximate closed-form result for the threshold spin current is presented, which depends on the minimum cutoff frequency the orbit can support. Precession about the hard axis has zero cutoff frequency and the lowest threshold, while the easy axis has the highest cutoff. A device setup is proposed for electrical control and detection of the dynamics, which is promising to demonstrate a tunable terahertz nano-oscillator.

References in corpus (18)

• Antiferromagnetic spintronics
• Control of spin-orbit torques through crystal symmetry in WTe2/ferromagnet bilayers
• Spin pumping and spin-transfer torques in antiferromagnets
• Antidamping torque-induced switching in biaxial antiferromagnetic insulators
• Spin transfer and current-induced switching in antiferromagnets
• Subterahertz spin pumping from an insulating antiferromagnet
• Terahertz Antiferromagnetic Spin Hall Nano-Oscillator
• Full angular dependence of the spin Hall and ordinary magnetoresistance in epitaxial antiferromagnetic NiO(001)/Pt thin films
• Antiferromagnetic Piezospintronics
• Spin Superfluidity in Biaxial Antiferromagnetic Insulators
• Spin superfluidity and long-range transport in thin-film ferromagnets
• Narrow-band tunable THz detector in antiferromagnets via Néel spin-orbit torque and spin-transfer torque
• Planar Hall driven torque in a FM/NM/FM system
• Intrinsic spin Hall effect in topological insulators: A first-principles study
• Antiferromagnetic Single-layer Spin-Orbit Torque Oscillators
• Dynamic Feedback in Ferromagnet/Spin Hall Metal Heterostructures
• Dynamics of Magnetoelectric Reversal of Antiferromagnetic Domain
• Phenomenological description of the dynamics of bipartite antiferromagnets in the limit of strong exchange

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• Chaotic Antiferromagnetic Nano-Oscillator driven by Spin-Torque
• Voltage-Controlled High-Bandwidth Terahertz Oscillators Based On Antiferromagnets
• Emission of fast-propagating spin waves by an antiferromagnetic domain wall driven by spin current
• Antiferromagnetic droplet soliton driven by spin current
• Artificial neurons based on antiferromagnetic auto-oscillators as a platform for neuromorphic computing
• Nonlinear spin dynamics of ferromagnetic ring in the vortex state and its application for spin-transfer nano-oscillator