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For prospective spintronics devices based on the propagation of pure spincurrents, antiferromagnets are an interesting class of materials thatpotentially entail a number of advantages as compared to ferromagnets. Here, wepresent a detailed theoretical study of magnonic spin current transport inferromagnetic-antiferromagnetic multilayers by using atomistic spin dynamicssimulations. The relevant length scales of magnonic spin transport inantiferromagnets are determined. We demonstrate the transfer of angularmomentum from a ferromagnet into an antiferromagnet due to the excitation ofonly one magnon branch in the antiferromagnet. As an experimental system, weascertain the transport across an antiferromagnet inYIG$|$Ir$_{20}$Mn$_{80}|$Pt heterostructures. We determine the spin transportsignals for spin currents generated in the YIG by the spin Seebeck effect andcompare to measurements of the spin Hall magnetoresistance in theheterostructure stack. By means of temperature-dependent andthickness-dependent measurements, we deduce conclusions on the spin transportmechanism across IrMn and furthermore correlate it to itsparamagnetic-antiferromagnetic phase transition.

Spin transport across antiferromagnets induced by the spin Seebeck effect