Scalable spin Seebeck thermoelectric generation using Fe-oxide nanoparticle assembled film on flexible substrate

Yuichiro Kurokawa; Yusuke Tahara; Yuki Hamada; Masahiro Fujimoto; Hiromi Yuasa

doi:10.1038/s41598-022-21200-9

Scalable spin Seebeck thermoelectric generation using Fe-oxide nanoparticle assembled film on flexible substrate

Sci Rep. 2022 Oct 5;12(1):16605. doi: 10.1038/s41598-022-21200-9.

Authors

Yuichiro Kurokawa¹, Yusuke Tahara², Yuki Hamada³, Masahiro Fujimoto³, Hiromi Yuasa³

Affiliations

¹ Graduate School and Faculty of Information Science and Electrical Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan. ykurokawa@ed.kyushu-u.ac.jp.
² Graduate School of Science and Technology, Shinshu University, Ueda, Nagano, 386-8567, Japan.
³ Graduate School and Faculty of Information Science and Electrical Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan.

Abstract

We fabricated Fe₃O₄ nanoparticle (NP)-assembled films on flexible polyimide sheets with Pt or Ta cap layer using a spin coating method and DC sputtering. The films were elaborated for spin Seebeck thermoelectric generator applications, and their spin Seebeck voltages were observed. We showed that the thermoelectric power of [Pt film/Fe₃O₄ NP]_n multilayered films increases with increasing number of stacking n. Additionally, we prepared spin Seebeck thermopile devices in which the Fe₃O₄ NP-assembled films capped by Pt and Ta are connected alternately in series. We demonstrated that spin Seebeck voltages of the thermopile devices are larger than those of single [Pt or Ta film/Fe₃O₄ NP]_n piece. Our results indicate that the spin Seebeck thermoelectric power of Fe₃O₄ NPs can be enhanced using a simple fabrication process without lithography technique.

Grants and funding

JPMJAX21K5/JST, ACT-X