Thickness dependence of spin Peltier effect visualized by thermal imaging technique

サーマルイメージング技術で可視化したスピンペルチェ効果の厚さ依存性

大門 俊介*; 内田 健一*; 氏家 奈緒美*; 服部 靖之*; 坪井 嶺*; 齊藤 英治

Daimon, Shunsuke*; Uchida, Kenichi*; Ujiie, Naomi*; Hattori, Yasuyuki*; Tsuboi, Rei*; Saito, Eiji

Magnon propagation length in a ferrimagnetic insulator yttrium iron garnet (YIG) has been investigated by measuring and analyzing the YIG-thickness dependence of the spin Peltier effect (SPE) in a Pt/YIG junction system. By means of the lock-in thermography technique, we measured the spatial distribution of the SPE-induced temperature modulation in the Pt/YIG system with the gradation, allowing us to obtain the accurate dependence of SPE with high resolution. Based on the dependence of SPE, we verified the applicability of several phenomenological models to estimate the magnon diffusion length in YIG.