  We propose a magnetization reversal model to explain the perpendicular
switching of a single ferromagnetic layer induced by an in-plane current.
Contrary to previously proposed reversal mechanisms that such magnetic
switching is directly from the Rashba or spin Hall effects, we suggest that
this type of switching arises from the current-induced chirality dependent
domain wall motion. By measuring the field dependent switching behaviors, we
show that such switching can also be achieved between any two multidomain
states, and all of these switching behaviors can be well explained by this
model. This model indicates that the spin Hall angle in such structures may be
overestimated and also predicts similar switching behaviors in other
ferromagnetic structures with chiral domain walls or skyrmions.
