  Complex oxide heterostructures are hot candidates for post CMOS
multi-functional devices. Especially in spintronics applications ferromagnetic
oxides may play a key role because they can exhibit extraordinary high spin
polarization. Indeed, there are already plenty of examples in spintronics,
notably in the area of spin pumping and inverse spin Hall effect (ISHE)
\cite{Azevedo2011, Czeschka2011, Hahn2013, Obstbaum2014}. Although complex
oxides have been used in these experiments as a source of spin currents, they
have never been demonstrated to act as a spin sink that exhibits ISHE. Here we
show that in a heterostructure consisting of La$_{0.7}$Sr$_{0.3}$MnO$_{3}$
(LSMO) and SrRuO$_{3}$ (SRO) the low temperature ferromagnet SRO can act as a
spin sink and exhibit a sizeable ISHE which persists even below its Curie
temperature. This result opens up new possibilities for application of all
oxide heterostructures in spintronics and may significantly extend the research
on spin Hall effect and related phenomena.
