Platinum thickness dependence and annealing effect of the spin-Seebeck voltage in platinum/yttrium iron garnet structures

We investigate the substrate annealing effect of thermoelectric voltage induced by the spin-Seebeck effect in Pt/polycrystalline yttrium iron garnet Y3Fe5O12 (YIG) structures with different Pt thicknesses. The thermoelectric voltage is increased by decreasing the Pt thickness to 1.9 nm as well as by annealing. Annealing at 1073 K for 5 h enhances the thermoelectric voltage up to 7.4 µV/K in structures with 1.9 nm Pt thickness.