Spin hydrodynamic generation

Matsuo, Mamoru

Spin-current generation by fluid motion is investigated. Spin-rotation coupling emerges in a rotating object and allows the angular momentum conversion from mechanical angular momentum into spins. We predicted that the spin current is mechanically generated along the vorticity gradient of the liquid metal pipe flow. Such spin-mechanical effect is experimentally confirmed by electric voltage generation in liquid metals. The use of the interconversion between spin and mechanical angular momentum opens up a new field of spintronics, where spin and mechanical motion are harmonized.