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We present a comprehensive study of the temperature (T) dependence of thelongitudinal spin Seebeck effect (LSSE) in Pt/EuO_{1-x} and Pt/La2NiMnO6 (LNMO)hybrid structures across their Curie temperatures (Tc). Both systems hostferromagnetic interaction below Tc, hence present optimal conditions fortesting magnon spin current based theories against ferrimagnetic YIG. Notably,we observe an anomalous Nernst effect (ANE) generated voltage in bareEuO_{1-x}, however, we find LSSE predominates the thermal signals in thebilayers with Pt. The T-dependence of the LSSE in small T-range near Tc couldbe fitted to a power law of the form (Tc-T)^P. The derived critical exponent,P, was verified for different methods of LSSE representation and samplecrystallinity. The results are explained based on the magnon-driven thermalspin pumping mechanism that relate the T-dependence of LSSE to the spin mixingconductance (Gmix) at the heavy metal/ferromagnet (HM/FM) interface, which inturn is known to vary in accordance with the square of the spontaneousmagnetization (Ms). Additionally, the T-dependence of the real part of Gmixderived from spin Hall magnetoresistance measurements at different temperaturesfor the Pt/LNMO structure, further establish the interdependence.

Role of spin mixing conductance in determining thermal spin pumping near the ferromagnetic phase transition in EuO_{1-x} and La2NiMnO6