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Thin films of perovskite oxides offer the possibility of combining emergingconcepts of strongly correlated electron phenomena and spin current in magneticdevices. However, spin transport and magnetization dynamics in these complexoxide materials are not well understood. Here, we experimentally quantify spintransport parameters and magnetization damping in epitaxial perovskiteferromagnet/paramagnet bilayers of La$_{2/3}$Sr$_{1/3}$MnO$_3$/SrRuO$_3$(LSMO/SRO) by broadband ferromagnetic resonance spectroscopy. From the SROthickness dependence of Gilbert damping, we estimate a short spin diffusionlength of $\lesssim$1 nm in SRO and an interfacial spin-mixing conductancecomparable to other ferromagnet/paramagnetic-metal bilayers. Moreover, we findthat anisotropic non-Gilbert damping due to two-magnon scattering alsoincreases with the addition of SRO. Our results demonstrate LSMO/SRO as aspin-source/spin-sink system that may be a foundation for examiningspin-current transport in various perovskite heterostructures.

Spin transport and dynamics in all-oxide perovskite La$_{2/3}$Sr$_{1/3}$MnO$_3$/SrRuO$_3$ bilayers probed by ferromagnetic resonance