Enhanced spin Seebeck effect via oxygen manipulationopen access
- Authors
- Kim, Jeong-Mok; Kim, Seok-Jong; Kang, Min-Gu; Choi, Jong-Guk; Lee, Soogil; Park, Jaehyeon; Van Phuoc, Cao; Kim, Kyoung-Whan; Kim, Kab-Jin; Jeong, Jong-Ryul; Lee, Kyung-Jin; Park, Byong-Guk
- Issue Date
- Jun-2023
- Publisher
- NATURE PORTFOLIO
- Citation
- NATURE COMMUNICATIONS, v.14, no.1
- Journal Title
- NATURE COMMUNICATIONS
- Volume
- 14
- Number
- 1
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/91779
- DOI
- 10.1038/s41467-023-39116-x
- ISSN
- 2041-1723
2041-1723
- 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.
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