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We propose here a high-frequency spin-Hall nano-oscillator based on a simplemagnetic texture, such as a domain wall, located in an antiferromagnet witheasy-axis anisotropy type. We show that the spin current, polarized along theanisotropy axis, excites a conical precession of the N\'eel vector in such adomain wall, which allows obtaining a robust ac output signal, -- contrary tothe planar precession in an uniform uniaxial antiferromagnet, where ac outputis hard to achieve. The frequency of the auto-oscillations is easily tunable bythe applied current up to the THz range, and the threshold current vanishes forpure uniaxial antiferromagnet. By micro-magnetic simulations, we demonstratethat the pinning of the domain wall is crucial for the oscillator design, whichcan be achieved in nano-constriction layout of the free layer.

Spin-Hall nanooscillator based on an antiferromagnetic domain wall