Spin Seebeck mechanical force.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 31197177.
- Also identified by DOI 10.1038/s41467-019-10625-y and PMC identifier 6565833.
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Abstract
Electric current has been used to send electricity to far distant places. On the other hand, spin current, a flow of electron spin, can in principle also send angular momentum to distant places. In a magnet, there is a universal spin carrier called a spin wave, a wave-type excitation of magnetization. Since spin waves exhibit a long propagation length, it should be able to send angular momentum that can generate torque and force at a distant place: a new function of magnets. Here we observe mechanical angular momentum transmission and force generation due to spin waves injected into Y<sub>3</sub>Fe<sub>5</sub>O<sub>12</sub> by the spin-Seebeck effect. The spin-wave current, transmitted through a Y<sub>3</sub>Fe<sub>5</sub>O<sub>12</sub> micro cantilever, was found to create a mechanical force on the cantilever as a non-local reaction of the spin-Seebeck effect. Spin-wave current can be generated remotely even in open circuits, and it can be used to drive micro mechanical devices.