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Field-free switching of perpendicularly magnetized ferromagnetic layer byspin orbit torque (SOT) from the spin Hall effect (SHE) is of great interest inthe applications of magnetic memory devices. In this paper, we investigate thedeterministic SOT switching through the joint effects of Dzyaloshinskii-MoriyaInteraction (DMI) and field-like torque (FLT) by micromagnetic simulations. Weconfirmed that within a certain range of DMI values and charge currentdensities, it is possible to deterministically switch the magnetization withoutthe assistance external magnetic field. We show that the FLT could play anadverse role in blocking and slowing down the magnetization switching undercertain cases of DMI and charge current-driven field-free switching. However,in other cases, FLT can assist DMI on the deterministic field-free SOTswitching. In addition, it is found that FLT can effectively expand the currentdensity window for a deterministic field-free SOT switching in the presence ofDMI.

journal of physics. d, applied physics

Deterministic Field-free Switching of a Perpendicularly Magnetized  Ferromagnetic Layer via the Joint Effects of Dzyaloshinskii-Moriya  Interaction and Field-like Spin-orbit Torque: An Appraisal