Giant spin hydrodynamic generation in laminar flow

R. Takahashi (), H. Chudo, M. Matsuo, K. Harii, Y. Ohnuma, S. Maekawa and E. Saitoh
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R. Takahashi: Faculty of Core Research, Ochanomizu University, Otsuka
H. Chudo: Japan Atomic Energy Agency
M. Matsuo: ERATO, Japan Science and Technology Agency
K. Harii: Japan Atomic Energy Agency
Y. Ohnuma: ERATO, Japan Science and Technology Agency
S. Maekawa: Japan Atomic Energy Agency
E. Saitoh: Japan Atomic Energy Agency

Nature Communications, 2020, vol. 11, issue 1, 1-6

Abstract: Abstract Hydrodynamic motion can generate a flux of electron-spin’s angular momentum via the coupling between fluid rotation and electron spins. Such hydrodynamic generation, called spin hydrodynamic generation (SHDG), has recently attracted attention in a wide range of fields, especially in spintronics. Spintronics deals with spin-mediated interconversion taking place on a micro or nano scale because of the spin-diffusion length scale. To be fully incorporated into the interconversion, SHDG physics should also be established in such a minute scale, where most fluids exhibit a laminar flow. Here, we report electric voltage generation due to the SHDG in a laminar flow of a liquid-metal mercury. The experimental results show a scaling rule unique to the laminar-flow SHDG. Furthermore, its energy conversion efficiency turns out to be about 105 greater than of the turbulent one. Our findings reveal that the laminar-flow SHDG is suitable to downsizing and to extend the coverage of fluid spintronics.

Date: 2020
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DOI: 10.1038/s41467-020-16753-0

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