Spin-Hall nanooscillator based on an antiferromagnetic domain wall

Abstract

We propose here a high-frequency spin-Hall nano-oscillator based on a simple magnetic texture, such as a domain wall, located in an antiferromagnet with easy-axis anisotropy type. We show that the spin current, polarized along the anisotropy axis, excites a conical precession of the Néel vector in such a domain wall, which allows obtaining a robust ac output signal, -- contrary to the planar precession in an uniform uniaxial antiferromagnet, where ac output is hard to achieve. The frequency of the auto-oscillations is easily tunable by the applied current up to the THz range, and the threshold current vanishes for pure uniaxial antiferromagnet. By micro-magnetic simulations, we demonstrate that the pinning of the domain wall is crucial for the oscillator design, which can be achieved in nano-constriction layout of the free layer.

7 pages, 5 figures. Brief explanation of the dynamics near the threshold is added at P.3

References in corpus (3)

• Phenomenology of Current-Induced Dynamics in Antiferromagnets
• Propulsion of a domain wall in an antiferromagnet by magnons
• Theory for a dissipative droplet soliton excited by a spin torque nanocontact

Cited by in corpus (6)

• Antiferromagnetic Bloch line driven by spin current as room-temperature analog of a fluxon in a long Josephson junction
• Spatial Antiferromagnetic Spin Texture as a Nano-Oscillator
• Emission of fast-propagating spin waves by an antiferromagnetic domain wall driven by spin current
• Voltage-Controlled High-Bandwidth Terahertz Oscillators Based On Antiferromagnets
• Current-controlled chirality dynamics in a mesoscopic magnetic domain wall
• Antiferromagnetic droplet soliton driven by spin current