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The effect of spin currents on the magnetic order of insulatingantiferromagnets (AFMs) is of fundamental interest and can enable newapplications. Toward this goal, characterizing the spin-orbit torques (SOT)associated with AFM/heavy metal (HM) interfaces is important. Here we reportthe full angular dependence of the harmonic Hall voltages in a predominantlyeasy-plane AFM, epitaxial c-axis oriented $\alpha$-Fe$_2$O$_3$ films, with aninterface to Pt. By modeling the harmonic Hall signals together with the$\alpha$-Fe$_2$O$_3$ magnetic parameters, we determine the amplitudes offield-like and damping-like SOT. Out-of-plane field scans are shown to beessential to determining the damping-like component of the torques. In contrastto ferromagnetic/heavy metal heterostructures, our results demonstrate that thefield-like torques are significantly larger than the damping-like torques,which we correlate with the presence of a large imaginary component of theinterface spin-mixing conductance. Our work demonstrates a direct way ofcharacterizing SOT in AFM/HM heterostructures.

Quantifying Spin-Orbit Torques in Antiferromagnet/Heavy Metal Heterostructures