  We present results on experimental studies of spin current, measured under
spin pumping at ferromag-netic resonance in wide frequency band 2-20 GHz for
SrIrO3/La0.7Sr0.3MnO3 heterostructures fabricated by RF magnetron sputtering at
high temperature. The epitaxial growth of the thin film in heterostructure by a
cube-on-cube mechanism was confirmed by XRD and TEM analysis. Taking into
account the con-tribution of anisotropic magnetoresistance the spin current was
estimated as 1/3 of the total response. We show that both real and imaginary
parts of spin mixing conductance are valuable for heterostructures with strong
spin-orbit interaction in SrIrO3. Imaginary part of spin mixing conductance was
estimated by means of shift of ferromagnetic resonance field of La0.7Sr0.3MnO3
layer in heterostructure. The spin mag-netoresistance was evaluated from
angular dependencies of magnetoresistance measured in planar Hall
configuration. In order to extract the influence of anisotropic
magnetoresistance a La0.7Sr0.3MnO3 film was measured as well. The spin Hall
angle for heterostructure was found higher than for interface Pt/
La0.7Sr0.3MnO3.
