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Title

The Spin Voltage Enhancement in Si/YIG/Co, Fe Spin Hall Thermopiles.

Authors

Kumpor, Wimutti; Kuptapol, Perawas; Wongjom, Chalothon; Pongophas, Ekkarat; Infahsaeng, Yingyot; Maiaugree, Wasan; Phumying, Santi; Pattanakul, Rungrueang; Horprathum, Mati; Chananonnawathorn, Chanunthorn; Piyasin, Piyawat; Pinitsoontorn, Supree; Ramamoorthy, Harihara; Somphonsane, Ratchanok; Pijitrojana, Wanchai; Ummartyotin, Sarut; Wongjom, Poramed; Ariyur, Kartik

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.

Subjects

YTTRIUM iron garnet; NERNST effect; SEEBECK effect; FERROMAGNETIC materials; THERMOPILES; SPIN valves

Publication

Journal of Engineering (2314-4912), 2024, Vol 2024, p1

ISSN

2314-4904

Publication type

Academic Journal

DOI

10.1155/je/1140159