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SrIrO$_3$ with its large spin-orbit coupling and low charge conductivity hasemerged as a potential candidate for efficient spin-orbit torque magnetizationcontrol in spintronic devices. We here report on the influence of aninterfacial oxide layer on spin pumping experiments in Ni$_{80}$Fe$_{20}$(NiFe)/SrIrO$_3$ bilayer heterostructures. To investigate this scenario we havecarried out broadband ferromagnetic resonance (BBFMR) measurements, whichindicate the presence of an interfacial antiferromagnetic oxide layer. Weperformed in-plane BBFMR experiments at cryogenic temperatures, which allowedus to simultaneously study dynamic spin pumping properties (Gilbert damping)and static magnetic properties (such as the effective magnetization andmagnetic anisotropy). The results for NiFe/SrIrO$_3$ bilayer thin films wereanalyzed and compared to those from a NiFe/NbN/SrIrO$_3$ trilayer referencesample, where a spin-transparent, ultra-thin NbN layer was inserted to preventoxidation of NiFe. At low temperatures, we observe substantial differences inthe magnetization dynamics parameters of these samples, which can be explainedby an antiferromagnetic interfacial layer in the NiFe/SrIrO$_3$ bilayers.

Effect of interfacial oxidation layer in spin pumping experiments on Ni$_{80}$Fe$_{20}$/SrIrO$_3$ heterostructures