Pt-Ru 合金を用いたスピンゼーベック起電力

摘要

Recently thermoelectric generator based on spin Seebeck effect has attracted wide attention. However, the thermoelectric conversion efficiency still needs to be improved. We found the Ru insertion between YIG and Pt improved the spin Seebeck voltage and there are several considerable models of voltage increase;oxidation barrier, Rashba effect, and alloying effect, but the possibility of former two candidates was found to be low by experimental. The remained candidate is alloying effect which leads increase of the skew scattering. In this investigation, we intentionally fabricated Pt-Ru alloy and studied the composition dependence on spin Seebeck coefficient (S) and power. SiO_2/YIG (50nm)/Pt80Ru20 (4.5nm) structure showed 2.09 times larger power than SiO_2/YIG (50nm)/Pt (4.5nm).