  Spin-orbitronics and single pulse all-optical switching (AOS) of
magnetization are two major successes of the rapidly advancing field of
nanomagnetism in recent years, with high potential for enabling novel, fast and
energy-efficient memory and logic platforms. Fast current-induced domain wall
motion (CIDWM) and single shot AOS have been individually demonstrated in
different ferrimagnetic alloys. However, the stringent requirement for their
composition control makes these alloys challenging materials for wafer-scale
production. Here, we simultaneously demonstrate fast CIDWM and energy efficient
AOS in a synthetic ferrimagnetic system based on multilayered [Co/Gd/Co/Gd]. We
firstly show that AOS is present in its full composition range. We find that
current-driven domain wall velocities over 2000 m/s at room temperature,
achieved by compensating the total angular momentum through layer thickness
tuning. Furthermore, analytical modeling of the CIDWM reveals that Joule
heating needs to be treated transiently to properly describe the CIDWM for our
sub-ns current pulses. Our studies establish [Co/Gd]-based synthetic
ferrimagnets to be a unique materials platform for domain wall devices with
access to ultrafast single pulse AOS.
