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Spin-orbit torque (SOT) is receiving tremendous attention from bothfundamental and application-oriented aspects. Co2MnGa, a Weyl ferromagnet thatis in a class of topological quantum materials, possesses cubic-based highstructural symmetry, the L21 crystal ordering, which should be incapable ofhosting anisotropic SOT in conventional understanding. Here we show thediscovery of a gigantic anisotropy of self-induced SOT in Co2MnGa. Themagnitude of the SOT is comparable to that of heavy metal/ferromagnet bilayersystems despite the high inversion symmetry of the Co2MnGa structure. Moresurprisingly, a sign inversion of the self-induced SOT is observed fordifferent crystal axes. This finding stems from the interplay of thetopological nature of the electronic states and their strong modulation byexternal strain. Our research enriches the understanding of the physics ofself-induced SOT and demonstrates a versatile method for tuning SOTefficiencies in a wide range of materials for topological and spintronicdevices.

Gigantic Anisotropy of Self-Induced Spin-Orbit Torque in Weyl Ferromagnet Co2MnGa