  By means of local ion implantation, we investigated the influence of lateral
interface on current-induced magnetic switching by spin-orbit torque in a
perpendicularly magnetized Pt/Co/Ta multilayer. The experimental results show
that, in this system, the domain wall motion under electrical current can be
affected by two mechanisms: symmetry breaking and current-driven N\'eel wall
motion at the lateral interface. The dominant mechanism is symmetry breaking
(current-driven N\'eel wall motion) at the large (small) current. Due to the
competitive relationship of these two mechanisms, the non-hysteresis effect
magnetic switching without an external magnetic field is obtained. Based on the
non-hysteresis effect magnetic switching, we can realize AND and OR logic gates
without resetting.
