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Enhancement of the Unconventional Spin-Orbit Torque Efficiency through Kagome Orientation Engineering in Epitaxial Noncollinear Antiferromagnet Mn3Sn.

Noncollinear antiferromagnets show great potential for next-generation spintronic devices due to their unique spin textures and ultrafast dynamics, with Kagome-lattice Mn3Sn a key spin-orbit torque (SOT) candidate enabled by room-temperature unconventional spin polarization. However, the impact of crystal orientation on its SOT efficiency remains unaddressed. Herein, we combine experiments and first-principles calculations to investigate Kagome-facet-dependent unconventional out-of-plane SOT in Mn3Sn, confirming z-direction polarized spin current and unconventional spin polarization in the mat…