  We proposed a novel and simple multilayer structure to realize the
deterministic switching of perpendicularly magnetized layers (Co in our work)
by spin orbital torque from the spin Hall Effect in this paper. A pinned layer
is introduced, antiferromagnetically coupled to the magnetic Co layer. We have
confirmed the deterministic switching of perpendicularly magnetized layers from
perspectives of switching loops, trajectories and switching properties under
periodic spin currents through micromagnetic simulation. The antiferromagnetic
interaction accounts for the deterministic switching exhibited in the structure
and the reversal ultimate state of the magnetic layer is predictable when the
applied spin current density is above 60MA/cm2. In our design, the
antiferromagnetic coupling is easily tunable and no external magnetic field is
needed.
