Spin hydrodynamic generation in unsteady flows

We theoretically investigate a spin-mediated conversion from fluid dynamics to voltage, known as spin hydrodynamic generation (SHDG), in oscillatory and transient unsteady flows. We consider unsteady flows of liquid metal between two parallel infinite planes and then calculate its vorticity fields b...

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Bibliographic Details
Published inarXiv.org
Main Authors Funato, Takumi, Matsuo, Mamoru
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 03.11.2022
Subjects
Angular momentum
Electric potential
Electron spin
Fluid dynamics
Fluid flow
Incompressible flow
Liquid metals
Physics - Fluid Dynamics
Physics - Mesoscale and Nanoscale Physics
Spin dynamics
Spintronics
Unsteady flow
Viscous fluids
Voltage
Vorticity
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Summary:We theoretically investigate a spin-mediated conversion from fluid dynamics to voltage, known as spin hydrodynamic generation (SHDG), in oscillatory and transient unsteady flows. We consider unsteady flows of liquid metal between two parallel infinite planes and then calculate its vorticity fields based on the Navier--Stokes equation for an incompressible viscous fluid. The spin accumulation and spin current generated by unsteady flows are derived using a spin-diffusion equation, including spin-vorticity coupling, which is a couple of angular momentum between electron spin and vorticity field in unsteady flows. The estimation of SHDG in liquid mercury flow suggests that an observable magnitude of voltage can be induced in unsteady flows. Our results are expected to enable the realization of high-speed spin devices with unsteady flows and broaden the range of fluid spintronics applicability.
ISSN:2331-8422
DOI:10.48550/arxiv.2210.16762