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Spin Seebeck mechanical force.

Kazuya Harii1,2, Yong-Jun Seo3, Yasumasa Tsutsumi4

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Spin waves, a type of magnetic excitation, can transmit angular momentum over distances. This study demonstrates spin waves generating mechanical force in micro-devices, enabling remote operation even in open circuits.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Electric currents transmit energy, while spin currents can transmit angular momentum.
  • Spin waves are universal spin carriers in magnets with long propagation lengths.
  • Magnets can potentially function to transmit angular momentum for mechanical applications.

Purpose of the Study:

  • To investigate the transmission of mechanical angular momentum via spin waves.
  • To demonstrate force generation at a distance using spin waves.
  • To explore the potential of spin waves in driving micro-mechanical devices.

Main Methods:

  • Injected spin waves into Yttrium Iron Garnet (Y3Fe5O12) using the spin-Seebeck effect.
  • Transmitted spin-wave current through a Y3Fe5O12 micro-cantilever.
  • Observed the resulting mechanical force and angular momentum transmission.

Main Results:

  • Confirmed mechanical angular momentum transmission through spin waves.
  • Demonstrated non-local force generation on a micro-cantilever via spin waves.
  • Showcased remote generation of spin-wave current in open circuits.

Conclusions:

  • Spin waves can effectively transmit angular momentum and generate mechanical forces remotely.
  • This phenomenon offers a new function for magnets, enabling the driving of micro-mechanical devices.
  • Spin-wave currents provide a pathway for wireless power and motion transfer in nanoscale systems.