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For deterministic magnetization switching by spin-orbit torque (SOT) in aperpendicular magnetic anisotropy system, an additional in-plane directionmagnetic field is essential for deterministic switching by breaking themagnetization symmetry. Realizing chirality in a magnetic ordering system canbe one approach for achieving asymmetry in the lateral direction for field-freemagnetization switching. However, systematic analysis of the influence of thechiral spin system on deterministic switching is still scarce. In this report,the achievement of field-free SOT-induced magnetization switching by using achiral spin configuration is investigated by experiments and micromagneticsimulations. We designed a system in which only part of the ferromagnetic layeroverlaps with the heavy metal layer in the Pt/Co/MgO structure. Therefore, aspin current is exerted only on a local area of the ferromagnetic layer, whichresults in a N\'eel-type chiral spin configuration. The induced chiral spinconfiguration can be stabilized (or destabilized) depending on the sign of theinterfacial Dzyaloshinskii-Moriya interaction of the system. The stabilizedspin configuration plays a crucial role in the deterministic switching in zerofield. We expect our findings to widen the perspective on chirality-basedall-electrical SOT device fabrication.

Role of the chiral spin configuration in field-free spin-orbit torque-induced magnetization switching by a locally injected spin current