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We investigated the magnetization reversal of a perpendicularly magnetizednanodevice using a chirped current pulse (CCP) via spin-orbit torques (SOT).Our findings demonstrate that both the field-like (FL) and damping-like (DL)components of SOT in CCP can efficiently induce ultrafast magnetizationreversal without any symmetry-breaking means. For a wide frequency range of theCCP, the minimal current density obtained is significantly smaller compared tothe current density of conventional SOT-reversal. This ultrafast reversal isdue to the CCP triggering enhanced energy absorption (emission) of themagnetization from (to) the FL- and DL-components of SOT before (after)crossing over the energy barrier. We also verified the robustness of theCCP-driven magnetization reversal at room temperature. Moreover, this strategycan be extended to switch the magnetic states of perpendicular syntheticantiferromagnetic (SAF) and ferrimagnetic (SFi) nanodevices. Therefore, thesestudies enrich the basic understanding of field-free SOT-reversal and provide anovel way to realize ultrafast SOT-MRAM devices with various free layerdesigns: ferromagnetic, SAF, and SFi.

Field-free ultrafast magnetization reversal of a nanodevice by a chirped current pulse via spin-orbit torque