極薄Ptレイヤの単結晶YIG膜および多結晶板によるLSSE素子のスピン熱電発電電圧

カテゴリ: 論文誌(論文単位)

グループ名: 【A】基礎・材料・共通部門

発行日: 2019/06/01

タイトル(英語): Spin-thermoelectric Voltage in Longitudinal SSE Elements incorporating LPE YIG Films and Polycrystalline YIG Slabs with an Ultrathin Pt Layer

著者名: 今村　正明（福岡工業大学），浅田　裕法（山口大学），田島　大輔（福岡工業大学），北川　二郎（福岡工業大学）

著者名(英語): Masaaki Imamura (Fukuoka Institute of Technology), Hironori Asada (Yamaguchi University), Daisuke Tashima (Fukuoka Institute of Technology), Jiro Kitagawa (Fukuoka Institute of Technology)

キーワード: 面内磁化配置スピンゼーベック効果，Pt/YIG二層接合，逆スピンホール効果，スピン熱電発電電圧　　longitudinal spin Seebeck effect，Pt/YIG bilayer interface，inverse spin Hall effect，spin-thermoelectric voltage

要約(英語): A spin-thermoelectric (STE) voltage is generated when a temperature gradient ΔT is applied to an element having a thin Pt layer coated on a magnetic substance. In this study, yttrium iron garnet (YIG) ferrimagnetic films prepared by liquid phase epitaxy (LPE) were tested as magnetic insulators. In addition, polycrystalline YIG slabs were tested to compare the STE voltages of film and slab samples. In a Pt coating and YIG film bilayer structure made by an ultrathin Pt layer of 1-4 nm thickness and an LPE film of ~10 μm thickness, a large STE voltage of 600 μV was observed at a probe distance of 5 mm with a temperature difference ΔT of 30 K. On the other hand, the STE voltage of a Pt layer and YIG slab bilayer structure was 340 μV, which is roughly half of that of the Pt/YIG-film element. The cause of the large voltage observed experimentally for the longitudinal spin Seebeck effect element incorporating an LPE YIG film was discussed mainly from the viewpoint of the Pt layer resistivity and the effects of YIG specimen surface conditions on crystallinity and the magnetization process.

本誌: 電気学会論文誌A（基礎・材料・共通部門誌） Vol.139 No.6 （2019）

本誌掲載ページ: 291-300 p

原稿種別: 論文／日本語

電子版へのリンク: https://www.jstage.jst.go.jp/article/ieejfms/139/6/139_291/_article/-char/ja/