Enhancement of the Unconventional Spin-Orbit Torque Efficiency through Kagome Orientation Engineering in Epitaxial
Sha Lu1, Meng Zhu2,3, Chuangwen Wu4
1School of Physics and Key Laboratory for Intelligent Sensing System and Security of Ministry of Education, Hubei University, Wuhan 430062, China.
Abstract:
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 material. Strikingly, (112̅0)-oriented Mn3Sn films exhibit 13-fold higher unconventional SOT efficiency ξz associated with z-direction spin polarization than (0002)-oriented counterparts, a behavior governed by Kagome lattice symmetry and facet-dependent spin transport. First-principles calculations further verify the Kagome plane's critical role in enhancing anisotropic spin textures and transport properties. This crystal-facet engineering strategy resolves the longstanding ambiguity in SOT anisotropy of noncollinear antiferromagnets and establishes Mn3Sn as a versatile platform for energy-efficient antiferromagnetic spintronic devices.
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