Enhanced spin Seebeck effect via oxygen manipulation

Jeong-Mok Kim, Seok-Jong Kim, Min-Gu Kang, Jong-Guk Choi, Soogil Lee, Jaehyeon Park, Cao Phuoc, Kyoung-Whan Kim, Kab-Jin Kim, Jong-Ryul Jeong, Kyung-Jin Lee () and Byong-Guk Park ()
Additional contact information
Jeong-Mok Kim: KAIST
Seok-Jong Kim: KAIST
Min-Gu Kang: KAIST
Jong-Guk Choi: KAIST
Soogil Lee: KAIST
Jaehyeon Park: KAIST
Cao Phuoc: Chungnam National University
Kyoung-Whan Kim: Korea Institute of Science and Technology
Kab-Jin Kim: KAIST
Jong-Ryul Jeong: Chungnam National University
Kyung-Jin Lee: KAIST
Byong-Guk Park: KAIST

Nature Communications, 2023, vol. 14, issue 1, 1-6

Abstract: Abstract Spin Seebeck effect (SSE) refers to the generation of an electric voltage transverse to a temperature gradient via a magnon current. SSE offers the potential for efficient thermoelectric devices because the transverse geometry of SSE enables to utilize waste heat from a large-area source by greatly simplifying the device structure. However, SSE suffers from a low thermoelectric conversion efficiency that must be improved for widespread application. Here we show that the SSE substantially enhances by oxidizing a ferromagnet in normal metal/ferromagnet/oxide structures. In W/CoFeB/AlOx structures, voltage-induced interfacial oxidation of CoFeB modifies the SSE, resulting in the enhancement of thermoelectric signal by an order of magnitude. We describe a mechanism for the enhancement that results from a reduced exchange interaction of the oxidized region of ferromagnet, which in turn increases a temperature difference between magnons in the ferromagnet and electrons in the normal metal and/or a gradient of magnon chemical potential in the ferromagnet. Our result will invigorate research for thermoelectric conversion by suggesting a promising way of improving the SSE efficiency.

Date: 2023
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DOI: 10.1038/s41467-023-39116-x

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