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The Spin Voltage Enhancement in Si/YIG/Co, Fe Spin Hall Thermopiles
Author(s)
Kumpor, Wimutti
Kuptapol, Perawas
Wongjom, Chalothon
Pongophas, Ekkarat
Infahsaeng, Yingyot
Maiaugree, Wasan
Phumying, Santi
Pattanakul, Rungrueang
Horprathum, Mati
Chananonnawathorn, Chanunthorn
Piyasin, Piyawat
Pinitsoontorn, Supree
Pijitrojana, Wanchai
Ummartyotin, Sarut
Wongjom, Poramed
Date Issued
January 1, 2024
Type
Article
Abstract
Spin-Hall thermopiles have been previously proposed as a means to enhance the spin Seebeck effect (SSE). However, the use of platinum (Pt) for spin detection drives costs high and proves an impediment for scalability. In this work, a cost-effective spin-Hall thermopile constructed from opposite spin-Hall angle ferromagnets, cobalt (Co) and iron (Fe), is reported. The devices are fabricated using a standard sputter-coated yttrium iron garnet (YIG) substrate that serves as the spin injector, and thermally evaporated Co and Fe strips that enable spin detection. When serially connected to form a (YIG/Co, Fe) thermopile structure, measurements indicate a significant enhancement of the spin voltage that results from the additive spin contributions of the opposite spin-Hall angle ferromagnets and the anomalous Nernst effect (ANE) that they exhibit. The YIG/Co, Fe thermopile reported here offers a cost-effective alternative to Pt-based thermopiles and the possibility of large-scale implementation to realize future thermoelectric generators.
Citation
Journal of Engineering United Kingdom, 2024(1), 2024