  We propose a new mechanism and a related device concept for a robust,
magnetic field tunable radio-frequency (rf) oscillator using the self
oscillation of a magnetic domain wall subject to a uniform static magnetic
field and a spatially non-uniform vertical dc spin current. The self
oscillation of the domain wall is created as it translates periodically between
two unstable positions, one being in the region where both the dc spin current
and the magnetic field are present, and the other, being where only the
magnetic field is present. The vertical dc spin current pushes it away from one
unstable position while the magnetic field pushes it away from the other. We
show that such oscillations are stable under noise and can exhibit a quality
factor of over 1000. A domain wall under dynamic translation, not only being a
source for rich physics, is also a promising candidate for advancements in
nanoelectronics with the actively researched racetrack memory architecture,
digital and analog switching paradigms as candidate examples. Devising a stable
rf oscillator using a domain wall is hence another step towards the realization
of an all domain wall logic scheme.
