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We have studied spin transport and magnetoresistance in yttrium iron garnet(YIG)/NiO/Pt trilayers with varied NiO thickness. To characterize the spintransport through NiO we excite ferromagnetic resonance in YIG with a microwavefrequency magnetic field and detect the voltage associated with the inversespin-Hall effect (ISHE) in the Pt layer. The ISHE signal is found to decayexponentially with the NiO thickness with a characteristic decay length of 3.9nm. This is contrasted with the magnetoresistance in these same structures. Thesymmetry of the magnetoresistive response is consistent with spin-Hallmagnetoresistance (SMR). However, in contrast to the ISHE response, as the NiOthickness increases the SMR signal goes towards zero abruptly at a NiOthickness of $\simeq$ 4 nm, highlighting the different length scales associatedwith the spin-transport in NiO and SMR in such trilayers.

Spin transport in antiferromagnetic NiO and magnetoresistance in Y$_3$Fe$_5$O$_{12}$/NiO/Pt structures