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Antiferromagnetic $\mathrm{L1_2}$-$\mathrm{Mn_3Ir}$ combines outstandingspin-transport properties with magnons in the terahertz (THz) frequency range.However, the THz radiation emitted by ultrafast spin-to-charge conversion viathe inverse spin Hall effect remains unexplored. In this study, we measured theTHz emission and transmission of a permalloy/(111)-oriented$\mathrm{L1_2}$-$\mathrm{Mn_3Ir}$ multilayer by THz time-domain spectroscopy.The spin Hall angle was determined to be approximately constant at 0.035 withina frequency range of 0.3-2.2 THz, in comparison with the THz spectroscopy of apermalloy/Pt multilayer. Our results not only demonstrate the potential of$\mathrm{L1_2}$-$\mathrm{Mn_3Ir}$ as a spintronic THz emitter but also provideinsights into the THz spin transport properties of$\mathrm{L1_2}$-$\mathrm{Mn_3Ir}$.

Ultrafast spin-to-charge conversions of antiferromagnetic (111)-oriented $\mathrm{L1_2}$-$\mathrm{Mn_3Ir}$