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Non-collinear antiferromagnets exhibits richer magneto-transport propertiesdue to the topologically nontrivial spin structure they possess compared toconventional nonmagnetic materials, which allows us to manipulate thecharge-spin conversion more freely by taking advantage of the chirality. Inthis work, we explore the unconventional spin orbit torque of L1$_2$-orderedMn$_3$Pt with a triangular spin structure. We observed an unconventional spinorbit torque along the $\mathbf{x}$-direction for the (001)-oriented L1$_2$Mn$_3$Pt, and found that it has a unique sign reversal behavior relative to thecrystalline orientation. This generation of unconventional spin orbit torquefor L1$_2$-ordered Mn$_3$Pt can be interpreted as stemming from the magneticspin Hall effect. This report help clarify the correlation between thetopologically nontrivial spin structure and charge-spin conversion innon-collinear antiferromagnets.

Observation of unconventional spin polarization induced spin orbit torque in L1$_2$-ordered antiferromagnetic Mn$_3$Pt thin films