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Previous studies have demonstrated spin-orbit torque (SOT) switching of Mn3Snwhere the spin polarization lies in the kagome plane (configuration I).However, the critical current density ($ J_{crit}$) is unrealistically large ($J_{crit}$=$ 10^{14}$ A/$ m^2$) and independent on the external field ($H_{ext}$). The stabilized magnetic state also depends on the initial state.These features conflict with the ferromagnet (FM) switching scheme as claimedin those studies, and thus call for other explanations. Alternatively, thesystem with the spin polarization perpendicular to the kagome plane(configuration II) is more like the FM based system since the spin polarizationis orthogonal to all magnetic moments. In this work, we show SOT switching ofMn3Sn in configuration II. Similar to the FM, Jcrit and Hext are in the orderof $ 10^{10}$ A/$ m^2$ and hundreds of Oersted, respectively. The switchingresult is also independent of the initial state. Interestingly, the unique spinstructure of Mn3Sn also leads to distinct features from FM systems. Wedemonstrate that Jcrit increases linearly with Hext, and extrapolation givesultralow $ J_{crit}$ for the field-free switching system. In addition, theswitching polarity is opposite to the FM. We also provide the switching phasediagram as a guideline for experimental demonstration. Our work providescomprehensive understanding for the switching mechanism in both configurations.The switching protocol proposed in this work is more advantageous in realisticspintronic applications. We also clearly reveal the fundamental differencebetween FM and noncollinear antiferromagnetic switching.

Deterministic Spin-Orbit Torque Switching of Mn3Sn with the Interplay between Spin Polarization and Kagome Plane