2 research outputs found
Control of field- and current-driven magnetic domain wall motion by exchange bias in Cr2 O3/Co/Pt trilayers
We investigate the motion of magnetic domain walls driven by magnetic fields and current-driven spin-orbit torques in an exchange-biased system with perpendicular magnetization. We consider Cr2O3/Co/Pt trilayers as a model system, in which the magnetization of the Co layer can be exchanged biased out-of-plane or in-plane depending on the field-cooling direction. In field-driven experiments, the in-plane exchange bias favors the propagation of the domain walls with internal magnetization parallel to the exchange-bias field. In current-driven experiments, the domain walls propagate along the current direction, but the domain wall velocity increases and decreases symmetrically (antisymmetrically) for both current polarities when the exchange bias is parallel (perpendicular) to the current line. At zero external field, the exchange bias modifies the velocity of current-driven domain wall motion by a factor of 10. We also find that the exchange bias remains stable under external fields up to 15 kOe and nanosecond-long current pulses with current density up to 3.5 × 1012 A/m. Our results demonstrate versatile control of the domain wall motion by exchange bias, which is relevant to achieve field-free switching of the magnetization in perpendicular systems and current-driven manipulation of domain walls velocity in spintronic device
Control of field- and current-driven magnetic domain wall motion by exchange-bias in Cr2O3/Co/Pt
We investigate the motion of magnetic domain walls driven by magnetic fields
and current-driven spin-orbit torques in an exchange-biased system with
perpendicular magnetization. We consider Cr2O3/Co/Pt as model system, in which
the magnetization of the Co layer can be exchanged-biased out-of-plane or
in-plane depending on the field cooling direction. In field-driven experiments,
the in-plane exchange bias favors the propagation of the domain walls with
internal magnetization parallel to the exchange bias field. In current-driven
experiments, the domain walls propagate along the current direction, but the
domain wall velocity increases and decreases symmetrically (antisymmetrically)
for both current polarities when the exchange bias is parallel (perpendicular)
to the current line. At zero external field, the exchange bias modifies the
velocity of current-driven domain wall motion by a factor of ten. We also find
that the exchange bias remains stable under external fields up to 15 kOe and
ns-long current pulses with current density up to 3.5x10^12 A/m. Our results
demonstrate versatile control of the domain wall motion by exchange bias, which
is relevant to achieve field-free switching of the magnetization in
perpendicular systems and current-driven manipulation of domain walls velocity
in spintronic devices