A scalable molecule-based magnetic thin film for spin-thermoelectric energy conversion

Inseon Oh, Jungmin Park, Daeseong Choe, Junhyeon Jo, Hyeonjung Jeong, Mi-Jin Jin, Younghun Jo, Joonki Suh, Byoung-Chul Min and Jung-Woo Yoo ()
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Inseon Oh: Ulsan National Institute of Science and Technology
Jungmin Park: Korea Basic Science Institute
Daeseong Choe: Ulsan National Institute of Science and Technology
Junhyeon Jo: Ulsan National Institute of Science and Technology
Hyeonjung Jeong: Ulsan National Institute of Science and Technology
Mi-Jin Jin: Ulsan National Institute of Science and Technology
Younghun Jo: Korea Basic Science Institute
Joonki Suh: Ulsan National Institute of Science and Technology
Byoung-Chul Min: Korea Institute of Science and Technology
Jung-Woo Yoo: Ulsan National Institute of Science and Technology

Nature Communications, 2021, vol. 12, issue 1, 1-7

Abstract: Abstract Spin thermoelectrics, an emerging thermoelectric technology, offers energy harvesting from waste heat with potential advantages of scalability and energy conversion efficiency, thanks to orthogonal paths for heat and charge flow. However, magnetic insulators previously used for spin thermoelectrics pose challenges for scale-up due to high temperature processing and difficulty in large-area deposition. Here, we introduce a molecule-based magnetic film for spin thermoelectric applications because it entails versatile synthetic routes in addition to weak spin-lattice interaction and low thermal conductivity. Thin films of CrII[CrIII(CN)6], Prussian blue analogue, electrochemically deposited on Cr electrodes at room temperature show effective spin thermoelectricity. Moreover, the ferromagnetic resonance studies exhibit an extremely low Gilbert damping constant ~(2.4 ± 0.67) × 10−4, indicating low loss of heat-generated magnons. The demonstrated STE applications of a new class of magnet will pave the way for versatile recycling of ubiquitous waste heat.

Date: 2021
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DOI: 10.1038/s41467-021-21058-x

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