Temperature dependence of spin pumping in YIG/NiO( x)/W multilayer

We report the temperature dependence of the spin pumping effect for Y ₃Fe ₅O ₁₂ (YIG, 0.9 μm)/NiO ( t _NiO)/W (6 nm) ( t _NiO = 0 nm, 1 nm, 2 nm, and 10 nm) heterostructures. All samples exhibit a strong temperature-dependent inverse spin Hall effect (ISHE) signal I _c and sensitivity to the NiO layer thickness. We observe a dramatic decrease of I _c with inserting thin NiO layer between YIG and W layers indicating that the inserting of NiO layer significantly suppresses the spin transport from YIG to W. In contrast to the noticeable enhancement in YIG/NiO ( t _NiO ≈ 1–2 nm)/Pt, the suppression of spin transport may be closely related to the specific interface-dependent spin scattering, spin memory loss, and spin conductance at the NiO/W interface. Besides, the I _c of YIG/NiO/W exhibits a maximum near the T _N of the AF NiO layer because the spins are transported dominantly by incoherent thermal magnons.