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The discovery of efficient magnetization switching activated by the spin Halleffect (SHE)-induced spin-orbit torque (SOT) changed the course of magneticrandom-access memory (MRAM) research and development. However, for systems withperpendicular magnetic anisotropy (PMA), the use of SOT is still hampered bythe necessity of a longitudinal magnetic field to break the magnetic symmetryto achieve deterministic switching. In this work, we first demonstrate that arobust and tunable field-free current-driven SOT switching of perpendicularmagnetization can be controlled by the growth protocol in Pt-based magneticheterostructures. It is further elucidated that such growth-dependent symmetrybreaking is originated from the laterally tilted magnetic anisotropy of theferromagnetic layer with PMA, which has been largely neglected in previousstudies and its critical role should be re-focused. We show by both experimentsand simulations that in a PMA system with tilted anisotropy, the deterministicfield-free switching possesses a conventional SHE-induced damping-like torquefeature and the resulting current-induced effective field has a non-lineardependence on the applied current density, which could be potentiallymisattributed to an unconventional SOT origin.

The Central Role of Tilted Anisotropy for Field-Free Spin-Orbit Torque Switching of Perpendicular Magnetization