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There has been considerable interest in spin-orbit torques for the purpose ofmanipulating the magnetization of ferromagnetic (FM) films or nano-elements forspintronic technologies. Spin-orbit torques are derived from spin currentscreated from charge currents in materials with significant spin-orbit couplingthat diffuse into an adjacent FM material. There have been intensive efforts tosearch for candidate materials that exhibit large spin Hall angles, i.e.efficient charge to spin current conversion. Here we report, using spin torqueferromagnetic resonance, the observation of a giant spin Hall angle of up to~0.35 in (100) oriented single crystalline antiferromagnetic (AF) IrMn3 thinfilms, coupled to ferromagnetic permalloy layers, and a spin Hall angle that isabout three times smaller in (111) oriented films. For the (100) orientedsamples we show that the magnitude of the spin Hall angle can be significantlychanged by manipulating the populations of the various AF domains through fieldannealing. Using ab-initio calculations we show that the triangular AFstructure of IrMn3 gives rise to a substantial intrinsic spin Hall conductivitythat is three times larger for the (100) than for the (111) orientations,consistent with our experimental findings.

Facet-dependent giant spin orbit torque in single crystalline antiferromagnetic Ir-Mn / ferromagnetic permalloy bilayers