Thermal spin transport phenomena and their correlation to magnetic properties of metallic Pt/Co _1-x Fe _x and Pt/Ni _1-x Fe _x bilayers

We investigate the thermal spin transport phenomena in ferromagnetic metals with an adjacent spin-polarized Pt layer examining sputter-deposited Pt/Co_1-xFe_x and Pt/Ni_1-xFe_x bilayers. We quantitatively disentangle the detected voltages generated by the spin Seebeck effect from the anomalous Nernst effect contributions arising from both the ferromagnetic metal and the spin-polarized Pt layer. Further, we probe the dependence of the aforementioned effects on the composition and on the magnetic moments of both the ferromagnetic metal and the spin-polarized Pt layer. We report a strong dependence of all effects on the composition via increase/decrease of the effect coefficients with increasing/decreasing magnetic moments of both the ferromagnetic metal and the spin-polarized Pt layer. Following our descriptions, our work provides quantitative spin Seebeck coefficients in metals and thermal spin transport coefficients in nominally non-magnetic materials such as Pt which will be the base for future designs of spin caloritronic applications.