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Insulating antiferromagnets are efficient and robust conductors of spincurrent. To realise the full potential of these materials within spintronics,the outstanding challenges are to demonstrate scalability down to nanometriclengthscales and the transmission of coherent spin currents. Here, we reportthe coherent transfer of spin angular momentum by excitation of evanescent spinwaves of GHz frequency within antiferromagnetic NiO at room temperature. Usingelement-specific and phase-resolved x-ray ferromagnetic resonance, we probe theinjection and transmission of ac spin current, and demonstrate that insertionof a few nanometre thick epitaxial NiO(001) layer between a ferromagnet andnon-magnet can even enhance the flow of spin current. Our results pave the waytowards coherent control of the phase and amplitude of spin currents at thenanoscale, and enable the realization of spin-logic devices and spin currentamplifiers that operate at GHz and THz frequencies.

Coherent transfer of spin angular momentum by evanescent spin waves within antiferromagnetic NiO