  Magnetic skyrmions are topological magnetic textures that hold great promise
as nanoscale bits of information in memory and logic devices. Although
room-temperature ferromagnetic skyrmions and their current-induced manipulation
have been demonstrated, their velocity has been limited to about 100 meters per
second. In addition, their dynamics are perturbed by the skyrmion Hall effect,
a motion transverse to the current direction caused by the skyrmion topological
charge. Here, we show that skyrmions in compensated synthetic antiferromagnets
can be moved by current along the current direction at velocities of up to 900
meters per second. This can be explained by the cancellation of the net
topological charge leading to a vanishing skyrmion Hall effect. Our results
open an important path toward the realization of logic and memory devices based
on the fast manipulation of skyrmions in tracks.
