  We propose a field-free switching mechanism that utilizes two spatially
orthogonal spin-orbit torque (SOT) currents. Initially applied simultaneously,
one of the currents is subsequently switched off. The superposition of these
two currents results in an in-plane magnetization, which is not orthogonal to
the remaining SOT current after the second one is deactivated. This
symmetry-breaking procedure leads to reproducible and rapid switching, with
field pulse durations as short as 0.25 nanoseconds.
