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 Y3Fe5O12 by the spin-Seebeck effect. The spin-wave current, transmitted through a Y3Fe5O12 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.
Highlights
Electric current has been used to send electricity to far distant places
A similar effect may arise from ferromagnetic resonance (FMR), where a magnet is rotated by a reaction of magnetization damping[4,5]
When the spin waves are relaxed in a part of the magnet, there should be its reaction on the magnet; due to the angular momentum conservation between spin waves and the lattice system of the magnet, the part of the magnet may start rotating
Summary
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 send angular momentum to distant places. We observe mechanical angular momentum transmission and force generation due to spin waves injected into Y3Fe5O12 by the spin-Seebeck effect. The spin-wave current, transmitted through a Y3Fe5O12 micro cantilever, was found to create a mechanical force on the cantilever as a non-local reaction of the spin-Seebeck effect. When the spin waves are relaxed in a part of the magnet, there should be its reaction on the magnet; due to the angular momentum conservation between spin waves and the lattice system of the magnet, the part of the magnet may start rotating (see Fig.[1]) Observing this unexplored spin-mechanical torque is our target in the present study
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